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+    <section id='main' class="content source"><pre class="line-numbers"><span id="1">  1</span>
+<span id="2">  2</span>
+<span id="3">  3</span>
+<span id="4">  4</span>
+<span id="5">  5</span>
+<span id="6">  6</span>
+<span id="7">  7</span>
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+<span id="150">150</span>
+<span id="151">151</span>
+<span id="152">152</span>
+<span id="153">153</span>
+<span id="154">154</span>
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+<span id="156">156</span>
+<span id="157">157</span>
+<span id="158">158</span>
+<span id="159">159</span>
+<span id="160">160</span>
+<span id="161">161</span>
+</pre><pre class='rust '>
+<span class='doccomment'>//! *Carboxyl* provides primitives for functional reactive programming in Rust.</span>
+<span class='doccomment'>//! It draws inspiration from the [Sodium][sodium] libraries and Push-Pull FRP,</span>
+<span class='doccomment'>//! as described by [Elliott (2009)][elliott_push_pull].</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! [sodium]: https://github.com/SodiumFRP/sodium/</span>
+<span class='doccomment'>//! [elliott_push_pull]: http://conal.net/papers/push-pull-frp/push-pull-frp.pdf</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! # Overview</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! Functional reactive programming (FRP) is a composable and modular</span>
+<span class='doccomment'>//! abstraction for creating dynamic and reactive systems. In its most general</span>
+<span class='doccomment'>//! form it models these systems as a composition of two basic primitives:</span>
+<span class='doccomment'>//! *streams* are a series of singular events and *signals* are continuously</span>
+<span class='doccomment'>//! changing values.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! *Carboxyl* is an imperative, hybrid push- and pull-based implementation of</span>
+<span class='doccomment'>//! FRP. Streams and the discrete components of signals are data-driven, i.e.</span>
+<span class='doccomment'>//! whenever an event occurs the resulting changes are propagated to everything</span>
+<span class='doccomment'>//! that depends on it.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! However, the continuous components of signals are demand-driven. Internally,</span>
+<span class='doccomment'>//! *Carboxyl* stores the state of a signal as a function. This function has to</span>
+<span class='doccomment'>//! be evaluated by consumers of a signal to obtain a concrete value.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! Nonetheless, *Carboxyl* has no explicit notion of time. Its signals are</span>
+<span class='doccomment'>//! functions that can be evaluated at any time, but they do not carry any</span>
+<span class='doccomment'>//! inherent notion of time. Synchronization and atomicity is achieved by a</span>
+<span class='doccomment'>//! transaction system.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! # Functional reactive primitives</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! This library provides two basic types: `Stream` and `Signal`. A stream is a</span>
+<span class='doccomment'>//! discrete sequence of events, a signal is a container for values that change</span>
+<span class='doccomment'>//! (discretely) over time.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! The FRP primitives are mostly implemented as methods of the basic types to</span>
+<span class='doccomment'>//! ease method chaining, except for the various lifting functions, as they do</span>
+<span class='doccomment'>//! not really belong to any type in particular.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! In addition, the `Sink` type allows one to create a stream of events by</span>
+<span class='doccomment'>//! sending values into it. It is the only way to create a stream from scratch,</span>
+<span class='doccomment'>//! i.e. without using any of the other primitives.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! # Usage example</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! Here is a simple example of how you can use the primitives provided by</span>
+<span class='doccomment'>//! *Carboxyl*. First of all, events can be sent into a *sink*. From a sink one</span>
+<span class='doccomment'>//! can create a *stream* of events. Streams can also be filtered, mapped and</span>
+<span class='doccomment'>//! merged. One can e.g. hold the last event from a stream as a signal.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! ```</span>
+<span class='doccomment'>//! use carboxyl::Sink;</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! let sink = Sink::new();</span>
+<span class='doccomment'>//! let stream = sink.stream();</span>
+<span class='doccomment'>//! let signal = stream.hold(3);</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! // The current value of the signal is initially 3</span>
+<span class='doccomment'>//! assert_eq!(signal.sample(), 3);</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! // When we fire an event, the signal get updated accordingly</span>
+<span class='doccomment'>//! sink.send(5);</span>
+<span class='doccomment'>//! assert_eq!(signal.sample(), 5);</span>
+<span class='doccomment'>//! ```</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! One can also directly iterate over the stream instead of holding it in a</span>
+<span class='doccomment'>//! signal:</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! ```</span>
+<span class='doccomment'>//! # use carboxyl::Sink;</span>
+<span class='doccomment'>//! # let sink = Sink::new();</span>
+<span class='doccomment'>//! # let stream = sink.stream();</span>
+<span class='doccomment'>//! let mut events = stream.events();</span>
+<span class='doccomment'>//! sink.send(4);</span>
+<span class='doccomment'>//! assert_eq!(events.next(), Some(4));</span>
+<span class='doccomment'>//! ```</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! Streams and signals can be combined using various primitives. We can map a</span>
+<span class='doccomment'>//! stream to another stream using a function:</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! ```</span>
+<span class='doccomment'>//! # use carboxyl::Sink;</span>
+<span class='doccomment'>//! # let sink: Sink&lt;i32&gt; = Sink::new();</span>
+<span class='doccomment'>//! # let stream = sink.stream();</span>
+<span class='doccomment'>//! let squares = stream.map(|x| x * x).hold(0);</span>
+<span class='doccomment'>//! sink.send(4);</span>
+<span class='doccomment'>//! assert_eq!(squares.sample(), 16);</span>
+<span class='doccomment'>//! ```</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! Or we can filter a stream to create a new one that only contains events that</span>
+<span class='doccomment'>//! satisfy a certain predicate:</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! ```</span>
+<span class='doccomment'>//! # use carboxyl::Sink;</span>
+<span class='doccomment'>//! # let sink: Sink&lt;i32&gt; = Sink::new();</span>
+<span class='doccomment'>//! # let stream = sink.stream();</span>
+<span class='doccomment'>//! let negatives = stream.filter(|&amp;x| x &lt; 0).hold(0);</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! // This won&#39;t arrive at the signal.</span>
+<span class='doccomment'>//! sink.send(4);</span>
+<span class='doccomment'>//! assert_eq!(negatives.sample(), 0);</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! // But this will!</span>
+<span class='doccomment'>//! sink.send(-3);</span>
+<span class='doccomment'>//! assert_eq!(negatives.sample(), -3);</span>
+<span class='doccomment'>//! ```</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! There are some other methods on streams and signals, that you can find in</span>
+<span class='doccomment'>//! their respective APIs.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! Note that all these objects are `Send + Sync + Clone`. This means you can</span>
+<span class='doccomment'>//! easily pass them around in your code, make clones, give them to another</span>
+<span class='doccomment'>//! thread, and they will still be updated correctly.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! You may have noticed that certain primitives take a function as an argument.</span>
+<span class='doccomment'>//! There is a limitation on what kind of functions can and should be used here.</span>
+<span class='doccomment'>//! In general, as FRP provides an abstraction around mutable state, they should</span>
+<span class='doccomment'>//! be pure functions (i.e. free of side effects).</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! For the most part this is guaranteed by Rust&#39;s type system. A static</span>
+<span class='doccomment'>//! function with a matching signature always works. A closure though is very</span>
+<span class='doccomment'>//! restricted: it must not borrow its environment, as it is impossible to</span>
+<span class='doccomment'>//! satisfy the lifetime requirements for that. So you can only move stuff into</span>
+<span class='doccomment'>//! it from the environment. However, the moved contents of the closure may also</span>
+<span class='doccomment'>//! not be altered, which is guaranteed by the `Fn(…) -&gt; …)` trait bound.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! However, both closures and functions could still have side effects such as</span>
+<span class='doccomment'>//! I/O, changing mutable state via `Mutex` or `RefCell`, etc. While Rust&#39;s type</span>
+<span class='doccomment'>//! system cannot prevent this, you should generally not pass such functions to</span>
+<span class='doccomment'>//! the FRP primitives, as they break the benefits you get from using FRP.</span>
+<span class='doccomment'>//! (An exception here is debugging output.)</span>
+
+<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>feature</span>(<span class='ident'>arc_weak</span>, <span class='ident'>fnbox</span>)]</span>
+<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>cfg_attr</span>(<span class='ident'>test</span>, <span class='ident'>feature</span>(<span class='ident'>test</span>, <span class='ident'>scoped</span>))]</span>
+<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>warn</span>(<span class='ident'>missing_docs</span>)]</span>
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>test</span>;
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>rand</span>;
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>quickcheck</span>;
+<span class='attribute'>#[<span class='ident'>macro_use</span>(<span class='ident'>lazy_static</span>)]</span>
+<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>lazy_static</span>;
+
+<span class='kw'>pub</span> <span class='kw'>use</span> <span class='ident'>stream</span>::{ <span class='ident'>Sink</span>, <span class='ident'>Stream</span> };
+<span class='kw'>pub</span> <span class='kw'>use</span> <span class='ident'>signal</span>::{ <span class='ident'>Signal</span>, <span class='ident'>SignalMut</span> };
+
+<span class='kw'>mod</span> <span class='ident'>transaction</span>;
+<span class='kw'>mod</span> <span class='ident'>source</span>;
+<span class='kw'>mod</span> <span class='ident'>pending</span>;
+<span class='kw'>mod</span> <span class='ident'>readonly</span>;
+<span class='kw'>mod</span> <span class='ident'>stream</span>;
+<span class='kw'>mod</span> <span class='ident'>signal</span>;
+<span class='attribute'>#[<span class='ident'>macro_use</span>]</span>
+<span class='kw'>pub</span> <span class='kw'>mod</span> <span class='ident'>lift</span>;
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>mod</span> <span class='ident'>testing</span>;
+</pre>
+</section>
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diff --git a/src/carboxyl/lift.rs.html b/src/carboxyl/lift.rs.html
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+<!DOCTYPE html>
+<html lang="en">
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+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta name="generator" content="rustdoc">
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+    <meta name="keywords" content="rust, rustlang, rust-lang">
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+
+    <section id='main' class="content source"><pre class="line-numbers"><span id="1">  1</span>
+<span id="2">  2</span>
+<span id="3">  3</span>
+<span id="4">  4</span>
+<span id="5">  5</span>
+<span id="6">  6</span>
+<span id="7">  7</span>
+<span id="8">  8</span>
+<span id="9">  9</span>
+<span id="10"> 10</span>
+<span id="11"> 11</span>
+<span id="12"> 12</span>
+<span id="13"> 13</span>
+<span id="14"> 14</span>
+<span id="15"> 15</span>
+<span id="16"> 16</span>
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+<span id="252">252</span>
+<span id="253">253</span>
+<span id="254">254</span>
+</pre><pre class='rust '>
+<span class='doccomment'>//! Lifting of n-ary functions.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! A lift maps a function on values to a function on signals. Given a function of</span>
+<span class='doccomment'>//! type `F: Fn(A, B, …) -&gt; R` and signals of types `Signal&lt;A&gt;, Signal&lt;B&gt;, …` the</span>
+<span class='doccomment'>//! `lift!` macro creates a `Signal&lt;R&gt;`, whose content is computed using the</span>
+<span class='doccomment'>//! function.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! Currently lift is only implemented for functions with up to four arguments.</span>
+<span class='doccomment'>//! This limitation is due to the current implementation strategy (and maybe</span>
+<span class='doccomment'>//! limitations of Rust&#39;s type system), but it can be increased to arbitrary but</span>
+<span class='doccomment'>//! finite arity if required.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! # Example</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! ```</span>
+<span class='doccomment'>//! # #[macro_use] extern crate carboxyl;</span>
+<span class='doccomment'>//! # fn main() {</span>
+<span class='doccomment'>//! # use carboxyl::Sink;</span>
+<span class='doccomment'>//! let sink_a = Sink::new();</span>
+<span class='doccomment'>//! let sink_b = Sink::new();</span>
+<span class='doccomment'>//! let product = lift!(</span>
+<span class='doccomment'>//!     |a, b| a * b,</span>
+<span class='doccomment'>//!     &amp;sink_a.stream().hold(0),</span>
+<span class='doccomment'>//!     &amp;sink_b.stream().hold(0)</span>
+<span class='doccomment'>//! );</span>
+<span class='doccomment'>//! assert_eq!(product.sample(), 0);</span>
+<span class='doccomment'>//! sink_a.send(3);</span>
+<span class='doccomment'>//! sink_b.send(5);</span>
+<span class='doccomment'>//! assert_eq!(product.sample(), 15);</span>
+<span class='doccomment'>//! # }</span>
+<span class='doccomment'>//! ```</span>
+
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::<span class='ident'>Arc</span>;
+<span class='kw'>use</span> <span class='ident'>signal</span>::{ <span class='ident'>Signal</span>, <span class='ident'>SignalFn</span>, <span class='ident'>signal_build</span>, <span class='ident'>signal_current</span>, <span class='ident'>signal_source</span>, <span class='ident'>reg_signal</span>, <span class='ident'>sample_raw</span> };
+<span class='kw'>use</span> <span class='ident'>transaction</span>::<span class='ident'>commit</span>;
+
+
+<span class='attribute'>#[<span class='ident'>macro_export</span>]</span>
+<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>lift</span> {
+    (<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>f</span>: <span class='ident'>expr</span>)
+        <span class='op'>=&gt;</span> ( <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>lift</span>::<span class='ident'>lift0</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>f</span>) );
+
+    (<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>f</span>: <span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>a</span>: <span class='ident'>expr</span>)
+        <span class='op'>=&gt;</span> ( <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>lift</span>::<span class='ident'>lift1</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>f</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>a</span>) );
+
+    (<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>f</span>: <span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>a</span>: <span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>b</span>: <span class='ident'>expr</span>)
+        <span class='op'>=&gt;</span> ( <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>lift</span>::<span class='ident'>lift2</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>f</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>a</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>b</span>) );
+
+    (<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>f</span>: <span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>a</span>: <span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>b</span>: <span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>c</span>: <span class='ident'>expr</span>)
+        <span class='op'>=&gt;</span> ( <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>lift</span>::<span class='ident'>lift3</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>f</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>a</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>b</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>c</span>) );
+
+    (<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>f</span>: <span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>a</span>: <span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>b</span>: <span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>c</span>: <span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>d</span>: <span class='ident'>expr</span>)
+        <span class='op'>=&gt;</span> ( <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>lift</span>::<span class='ident'>lift4</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>f</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>a</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>b</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>c</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>d</span>) );
+}
+
+
+<span class='doccomment'>/// Lift a 0-ary function.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>lift0</span><span class='op'>&lt;</span><span class='ident'>A</span>, <span class='ident'>F</span><span class='op'>&gt;</span>(<span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>
+    <span class='kw'>where</span> <span class='ident'>F</span>: <span class='ident'>Fn</span>() <span class='op'>-&gt;</span> <span class='ident'>A</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>
+{
+    <span class='ident'>commit</span>(<span class='op'>||</span> <span class='ident'>signal_build</span>(<span class='ident'>SignalFn</span>::<span class='ident'>from_fn</span>(<span class='ident'>f</span>), ()))
+}
+
+
+<span class='doccomment'>/// Lift a unary function.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>lift1</span><span class='op'>&lt;</span><span class='ident'>A</span>, <span class='ident'>B</span>, <span class='ident'>F</span><span class='op'>&gt;</span>(<span class='ident'>f</span>: <span class='ident'>F</span>, <span class='ident'>sa</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span>
+    <span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+          <span class='ident'>B</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+          <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='ident'>A</span>) <span class='op'>-&gt;</span> <span class='ident'>B</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+{
+    <span class='kw'>fn</span> <span class='ident'>make_callback</span><span class='op'>&lt;</span><span class='ident'>A</span>, <span class='ident'>B</span>, <span class='ident'>F</span><span class='op'>&gt;</span>(<span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='ident'>Arc</span><span class='op'>&lt;</span><span class='ident'>F</span><span class='op'>&gt;</span>, <span class='ident'>parent</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>SignalFn</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span>
+        <span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+              <span class='ident'>B</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+              <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='ident'>A</span>) <span class='op'>-&gt;</span> <span class='ident'>B</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+    {
+        <span class='kw'>let</span> <span class='ident'>pclone</span> <span class='op'>=</span> <span class='ident'>parent</span>.<span class='ident'>clone</span>();
+        <span class='kw'>let</span> <span class='ident'>f</span> <span class='op'>=</span> <span class='ident'>f</span>.<span class='ident'>clone</span>();
+        <span class='kw'>match</span> <span class='op'>*</span><span class='ident'>signal_current</span>(<span class='kw-2'>&amp;</span><span class='ident'>parent</span>).<span class='ident'>read</span>().<span class='ident'>unwrap</span>().<span class='ident'>future</span>() {
+            <span class='ident'>SignalFn</span>::<span class='ident'>Const</span>(<span class='kw-2'>ref</span> <span class='ident'>a</span>) <span class='op'>=&gt;</span> <span class='ident'>SignalFn</span>::<span class='ident'>Const</span>(<span class='ident'>f</span>(<span class='ident'>a</span>.<span class='ident'>clone</span>())),
+            <span class='ident'>SignalFn</span>::<span class='ident'>Func</span>(_) <span class='op'>=&gt;</span> <span class='ident'>SignalFn</span>::<span class='ident'>from_fn</span>(<span class='kw'>move</span> <span class='op'>||</span> <span class='ident'>f</span>(<span class='ident'>sample_raw</span>(<span class='kw-2'>&amp;</span><span class='ident'>pclone</span>))),
+        }
+    }
+
+    <span class='ident'>commit</span>(<span class='op'>||</span> {
+        <span class='kw'>let</span> <span class='ident'>f</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>f</span>);
+        <span class='kw'>let</span> <span class='ident'>signal</span> <span class='op'>=</span> <span class='ident'>signal_build</span>(<span class='ident'>make_callback</span>(<span class='kw-2'>&amp;</span><span class='ident'>f</span>, <span class='kw-2'>&amp;</span><span class='ident'>sa</span>), ());
+        <span class='kw'>let</span> <span class='ident'>sa_clone</span> <span class='op'>=</span> <span class='ident'>sa</span>.<span class='ident'>clone</span>();
+        <span class='ident'>reg_signal</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>signal_source</span>(<span class='kw-2'>&amp;</span><span class='ident'>sa</span>).<span class='ident'>write</span>().<span class='ident'>unwrap</span>(), <span class='kw-2'>&amp;</span><span class='ident'>signal</span>,
+            <span class='kw'>move</span> <span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>make_callback</span>(<span class='kw-2'>&amp;</span><span class='ident'>f</span>, <span class='kw-2'>&amp;</span><span class='ident'>sa_clone</span>));
+        <span class='ident'>signal</span>
+    })
+}
+
+
+<span class='doccomment'>/// Lift a binary function.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>lift2</span><span class='op'>&lt;</span><span class='ident'>A</span>, <span class='ident'>B</span>, <span class='ident'>C</span>, <span class='ident'>F</span><span class='op'>&gt;</span>(<span class='ident'>f</span>: <span class='ident'>F</span>, <span class='ident'>sa</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>, <span class='ident'>sb</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>C</span><span class='op'>&gt;</span>
+    <span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+          <span class='ident'>B</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+          <span class='ident'>C</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+          <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='ident'>A</span>, <span class='ident'>B</span>) <span class='op'>-&gt;</span> <span class='ident'>C</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+{
+    <span class='kw'>fn</span> <span class='ident'>make_callback</span><span class='op'>&lt;</span><span class='ident'>A</span>, <span class='ident'>B</span>, <span class='ident'>C</span>, <span class='ident'>F</span><span class='op'>&gt;</span>(<span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='ident'>Arc</span><span class='op'>&lt;</span><span class='ident'>F</span><span class='op'>&gt;</span>, <span class='ident'>sa</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>, <span class='ident'>sb</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>SignalFn</span><span class='op'>&lt;</span><span class='ident'>C</span><span class='op'>&gt;</span>
+        <span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+              <span class='ident'>B</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+              <span class='ident'>C</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+              <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='ident'>A</span>, <span class='ident'>B</span>) <span class='op'>-&gt;</span> <span class='ident'>C</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+    {
+        <span class='kw'>use</span> <span class='ident'>signal</span>::<span class='ident'>SignalFn</span>::{ <span class='ident'>Const</span>, <span class='ident'>Func</span> };
+        <span class='kw'>let</span> <span class='ident'>sa_clone</span> <span class='op'>=</span> <span class='ident'>sa</span>.<span class='ident'>clone</span>();
+        <span class='kw'>let</span> <span class='ident'>sb_clone</span> <span class='op'>=</span> <span class='ident'>sb</span>.<span class='ident'>clone</span>();
+        <span class='kw'>let</span> <span class='ident'>f</span> <span class='op'>=</span> <span class='ident'>f</span>.<span class='ident'>clone</span>();
+        <span class='kw'>match</span> (
+            <span class='ident'>signal_current</span>(<span class='kw-2'>&amp;</span><span class='ident'>sa</span>).<span class='ident'>read</span>().<span class='ident'>unwrap</span>().<span class='ident'>future</span>(),
+            <span class='ident'>signal_current</span>(<span class='kw-2'>&amp;</span><span class='ident'>sb</span>).<span class='ident'>read</span>().<span class='ident'>unwrap</span>().<span class='ident'>future</span>(),
+        ) {
+            (<span class='kw-2'>&amp;</span><span class='ident'>Const</span>(<span class='kw-2'>ref</span> <span class='ident'>a</span>), <span class='kw-2'>&amp;</span><span class='ident'>Const</span>(<span class='kw-2'>ref</span> <span class='ident'>b</span>)) <span class='op'>=&gt;</span> <span class='ident'>Const</span>(<span class='ident'>f</span>(<span class='ident'>a</span>.<span class='ident'>clone</span>(), <span class='ident'>b</span>.<span class='ident'>clone</span>())),
+            (<span class='kw-2'>&amp;</span><span class='ident'>Const</span>(<span class='kw-2'>ref</span> <span class='ident'>a</span>), <span class='kw-2'>&amp;</span><span class='ident'>Func</span>(_)) <span class='op'>=&gt;</span> {
+                <span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>a</span>.<span class='ident'>clone</span>();
+                <span class='ident'>SignalFn</span>::<span class='ident'>from_fn</span>(<span class='kw'>move</span> <span class='op'>||</span> <span class='ident'>f</span>(<span class='ident'>a</span>.<span class='ident'>clone</span>(), <span class='ident'>sample_raw</span>(<span class='kw-2'>&amp;</span><span class='ident'>sb_clone</span>)))
+            },
+            (<span class='kw-2'>&amp;</span><span class='ident'>Func</span>(_), <span class='kw-2'>&amp;</span><span class='ident'>Const</span>(<span class='kw-2'>ref</span> <span class='ident'>b</span>)) <span class='op'>=&gt;</span> {
+                <span class='kw'>let</span> <span class='ident'>b</span> <span class='op'>=</span> <span class='ident'>b</span>.<span class='ident'>clone</span>();
+                <span class='ident'>SignalFn</span>::<span class='ident'>from_fn</span>(<span class='kw'>move</span> <span class='op'>||</span> <span class='ident'>f</span>(<span class='ident'>sample_raw</span>(<span class='kw-2'>&amp;</span><span class='ident'>sa_clone</span>), <span class='ident'>b</span>.<span class='ident'>clone</span>()))
+            },
+            (<span class='kw-2'>&amp;</span><span class='ident'>Func</span>(_), <span class='kw-2'>&amp;</span><span class='ident'>Func</span>(_)) <span class='op'>=&gt;</span> <span class='ident'>SignalFn</span>::<span class='ident'>from_fn</span>(
+                <span class='kw'>move</span> <span class='op'>||</span> <span class='ident'>f</span>(<span class='ident'>sample_raw</span>(<span class='kw-2'>&amp;</span><span class='ident'>sa_clone</span>), <span class='ident'>sample_raw</span>(<span class='kw-2'>&amp;</span><span class='ident'>sb_clone</span>))
+            ),
+        }
+    }
+
+    <span class='ident'>commit</span>(<span class='kw'>move</span> <span class='op'>||</span> {
+        <span class='kw'>let</span> <span class='ident'>f</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>f</span>);
+        <span class='kw'>let</span> <span class='ident'>signal</span> <span class='op'>=</span> <span class='ident'>signal_build</span>(<span class='ident'>make_callback</span>(<span class='kw-2'>&amp;</span><span class='ident'>f</span>, <span class='kw-2'>&amp;</span><span class='ident'>sa</span>, <span class='kw-2'>&amp;</span><span class='ident'>sb</span>), ());
+        <span class='ident'>reg_signal</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>signal_source</span>(<span class='kw-2'>&amp;</span><span class='ident'>sa</span>).<span class='ident'>write</span>().<span class='ident'>unwrap</span>(), <span class='kw-2'>&amp;</span><span class='ident'>signal</span>, {
+            <span class='kw'>let</span> <span class='ident'>sa_clone</span> <span class='op'>=</span> <span class='ident'>sa</span>.<span class='ident'>clone</span>();
+            <span class='kw'>let</span> <span class='ident'>sb_clone</span> <span class='op'>=</span> <span class='ident'>sb</span>.<span class='ident'>clone</span>();
+            <span class='kw'>let</span> <span class='ident'>f</span> <span class='op'>=</span> <span class='ident'>f</span>.<span class='ident'>clone</span>();
+            <span class='kw'>move</span> <span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>make_callback</span>(<span class='kw-2'>&amp;</span><span class='ident'>f</span>, <span class='kw-2'>&amp;</span><span class='ident'>sa_clone</span>, <span class='kw-2'>&amp;</span><span class='ident'>sb_clone</span>)
+        });
+        <span class='ident'>reg_signal</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>signal_source</span>(<span class='kw-2'>&amp;</span><span class='ident'>sb</span>).<span class='ident'>write</span>().<span class='ident'>unwrap</span>(), <span class='kw-2'>&amp;</span><span class='ident'>signal</span>, {
+            <span class='kw'>let</span> <span class='ident'>sa_clone</span> <span class='op'>=</span> <span class='ident'>sa</span>.<span class='ident'>clone</span>();
+            <span class='kw'>let</span> <span class='ident'>sb_clone</span> <span class='op'>=</span> <span class='ident'>sb</span>.<span class='ident'>clone</span>();
+            <span class='kw'>move</span> <span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>make_callback</span>(<span class='kw-2'>&amp;</span><span class='ident'>f</span>, <span class='kw-2'>&amp;</span><span class='ident'>sa_clone</span>, <span class='kw-2'>&amp;</span><span class='ident'>sb_clone</span>)
+        });
+        <span class='ident'>signal</span>
+    })
+}
+
+<span class='doccomment'>/// Lift a ternary function.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>lift3</span><span class='op'>&lt;</span><span class='ident'>F</span>, <span class='ident'>A</span>, <span class='ident'>B</span>, <span class='ident'>C</span>, <span class='ident'>Ret</span><span class='op'>&gt;</span>(<span class='ident'>f</span>: <span class='ident'>F</span>, <span class='ident'>ca</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>, <span class='ident'>cb</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span>, <span class='ident'>cc</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>C</span><span class='op'>&gt;</span>)
+    <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>Ret</span><span class='op'>&gt;</span>
+<span class='kw'>where</span> <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='ident'>A</span>, <span class='ident'>B</span>, <span class='ident'>C</span>) <span class='op'>-&gt;</span> <span class='ident'>Ret</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+      <span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+      <span class='ident'>B</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+      <span class='ident'>C</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+      <span class='ident'>Ret</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+{
+    <span class='ident'>lift2</span>(<span class='kw'>move</span> <span class='op'>|</span>(<span class='ident'>a</span>, <span class='ident'>b</span>), <span class='ident'>c</span><span class='op'>|</span> <span class='ident'>f</span>(<span class='ident'>a</span>, <span class='ident'>b</span>, <span class='ident'>c</span>), <span class='kw-2'>&amp;</span><span class='ident'>lift2</span>(<span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> (<span class='ident'>a</span>, <span class='ident'>b</span>), <span class='ident'>ca</span>, <span class='ident'>cb</span>), <span class='ident'>cc</span>)
+}
+
+<span class='doccomment'>/// Lift a quarternary function.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>lift4</span><span class='op'>&lt;</span><span class='ident'>F</span>, <span class='ident'>A</span>, <span class='ident'>B</span>, <span class='ident'>C</span>, <span class='ident'>D</span>, <span class='ident'>Ret</span><span class='op'>&gt;</span>(<span class='ident'>f</span>: <span class='ident'>F</span>, <span class='ident'>ca</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>, <span class='ident'>cb</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span>, <span class='ident'>cc</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>C</span><span class='op'>&gt;</span>, <span class='ident'>cd</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>D</span><span class='op'>&gt;</span>)
+    <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>Ret</span><span class='op'>&gt;</span>
+<span class='kw'>where</span> <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='ident'>A</span>, <span class='ident'>B</span>, <span class='ident'>C</span>, <span class='ident'>D</span>) <span class='op'>-&gt;</span> <span class='ident'>Ret</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+      <span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+      <span class='ident'>B</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+      <span class='ident'>C</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+      <span class='ident'>D</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+      <span class='ident'>Ret</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+{
+    <span class='ident'>lift2</span>(
+        <span class='kw'>move</span> <span class='op'>|</span>(<span class='ident'>a</span>, <span class='ident'>b</span>), (<span class='ident'>c</span>, <span class='ident'>d</span>)<span class='op'>|</span> <span class='ident'>f</span>(<span class='ident'>a</span>, <span class='ident'>b</span>, <span class='ident'>c</span>, <span class='ident'>d</span>),
+        <span class='kw-2'>&amp;</span><span class='ident'>lift2</span>(<span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> (<span class='ident'>a</span>, <span class='ident'>b</span>), <span class='ident'>ca</span>, <span class='ident'>cb</span>),
+        <span class='kw-2'>&amp;</span><span class='ident'>lift2</span>(<span class='op'>|</span><span class='ident'>c</span>, <span class='ident'>d</span><span class='op'>|</span> (<span class='ident'>c</span>, <span class='ident'>d</span>), <span class='ident'>cc</span>, <span class='ident'>cd</span>)
+    )
+}
+
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>mod</span> <span class='ident'>test</span> {
+    <span class='kw'>use</span> <span class='ident'>stream</span>::<span class='ident'>Sink</span>;
+    <span class='kw'>use</span> <span class='ident'>signal</span>::<span class='ident'>Signal</span>;
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>lift0</span>() {
+        <span class='kw'>let</span> <span class='ident'>signal</span> <span class='op'>=</span> <span class='macro'>lift</span><span class='macro'>!</span>(<span class='op'>||</span> <span class='number'>3</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>signal</span>.<span class='ident'>sample</span>(), <span class='number'>3</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>lift1</span>() {
+        <span class='kw'>let</span> <span class='ident'>sig2</span> <span class='op'>=</span> <span class='macro'>lift</span><span class='macro'>!</span>(<span class='op'>|</span><span class='ident'>n</span><span class='op'>|</span> <span class='ident'>n</span> <span class='op'>+</span> <span class='number'>2</span>, <span class='kw-2'>&amp;</span><span class='ident'>Signal</span>::<span class='ident'>new</span>(<span class='number'>3</span>));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>sig2</span>.<span class='ident'>sample</span>(), <span class='number'>5</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>lift2</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink1</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>sink2</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>lifted</span> <span class='op'>=</span> <span class='macro'>lift</span><span class='macro'>!</span>(<span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> <span class='ident'>a</span> <span class='op'>+</span> <span class='ident'>b</span>, <span class='kw-2'>&amp;</span><span class='ident'>sink1</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='number'>0</span>),
+            <span class='kw-2'>&amp;</span><span class='ident'>sink2</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='number'>3</span>));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>lifted</span>.<span class='ident'>sample</span>(), <span class='number'>3</span>);
+        <span class='ident'>sink1</span>.<span class='ident'>send</span>(<span class='number'>1</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>lifted</span>.<span class='ident'>sample</span>(), <span class='number'>4</span>);
+        <span class='ident'>sink2</span>.<span class='ident'>send</span>(<span class='number'>11</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>lifted</span>.<span class='ident'>sample</span>(), <span class='number'>12</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>lift2_identical</span>() {
+        <span class='kw'>let</span> <span class='ident'>sig</span> <span class='op'>=</span> <span class='ident'>Signal</span>::<span class='ident'>new</span>(<span class='number'>16</span>);
+        <span class='kw'>let</span> <span class='ident'>sig2</span> <span class='op'>=</span> <span class='macro'>lift</span><span class='macro'>!</span>(<span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> <span class='ident'>a</span> <span class='op'>+</span> <span class='ident'>b</span>, <span class='kw-2'>&amp;</span><span class='ident'>sig</span>, <span class='kw-2'>&amp;</span><span class='ident'>sig</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>sig2</span>.<span class='ident'>sample</span>(), <span class='number'>32</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>lift3</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(
+            <span class='macro'>lift</span><span class='macro'>!</span>(<span class='op'>|</span><span class='ident'>x</span>, <span class='ident'>y</span>, <span class='ident'>z</span><span class='op'>|</span> <span class='ident'>x</span> <span class='op'>+</span> <span class='number'>2</span> <span class='op'>*</span> <span class='ident'>y</span> <span class='op'>+</span> <span class='ident'>z</span>,
+                <span class='kw-2'>&amp;</span><span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='number'>5</span>),
+                <span class='kw-2'>&amp;</span><span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='number'>3</span>),
+                <span class='kw-2'>&amp;</span><span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='op'>-</span><span class='number'>4</span>)
+            ).<span class='ident'>sample</span>(),
+            <span class='number'>7</span>
+        );
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>lift4</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(
+            <span class='macro'>lift</span><span class='macro'>!</span>(<span class='op'>|</span><span class='ident'>w</span>, <span class='ident'>x</span>, <span class='ident'>y</span>, <span class='ident'>z</span><span class='op'>|</span> <span class='number'>4</span> <span class='op'>*</span> <span class='ident'>w</span> <span class='op'>+</span> <span class='ident'>x</span> <span class='op'>+</span> <span class='number'>2</span> <span class='op'>*</span> <span class='ident'>y</span> <span class='op'>+</span> <span class='ident'>z</span>,
+                <span class='kw-2'>&amp;</span><span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='op'>-</span><span class='number'>2</span>),
+                <span class='kw-2'>&amp;</span><span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='number'>5</span>),
+                <span class='kw-2'>&amp;</span><span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='number'>3</span>),
+                <span class='kw-2'>&amp;</span><span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='op'>-</span><span class='number'>4</span>)
+            ).<span class='ident'>sample</span>(),
+            <span class='op'>-</span><span class='number'>1</span>
+        );
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>lift0_equal_within_transaction</span>() {
+        <span class='kw'>use</span> <span class='ident'>rand</span>::<span class='ident'>random</span>;
+        <span class='comment'>// Generate a completely random signal</span>
+        <span class='kw'>let</span> <span class='ident'>rnd</span> <span class='op'>=</span> <span class='macro'>lift</span><span class='macro'>!</span>(<span class='ident'>random</span>::<span class='op'>&lt;</span><span class='ident'>i64</span><span class='op'>&gt;</span>);
+        <span class='comment'>// Make a tuple with itself</span>
+        <span class='kw'>let</span> <span class='ident'>gather</span> <span class='op'>=</span> <span class='macro'>lift</span><span class='macro'>!</span>(<span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> (<span class='ident'>a</span>, <span class='ident'>b</span>), <span class='kw-2'>&amp;</span><span class='ident'>rnd</span>, <span class='kw-2'>&amp;</span><span class='ident'>rnd</span>);
+        <span class='comment'>// Both components should be equal</span>
+        <span class='kw'>let</span> (<span class='ident'>a</span>, <span class='ident'>b</span>) <span class='op'>=</span> <span class='ident'>gather</span>.<span class='ident'>sample</span>();
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>a</span>, <span class='ident'>b</span>);
+    }
+}
+</pre>
+</section>
+    <section id='search' class="content hidden"></section>
+
+    <section class="footer"></section>
+
+    <div id="help" class="hidden">
+        <div class="shortcuts">
+            <h1>Keyboard shortcuts</h1>
+            <dl>
+                <dt>?</dt>
+                <dd>Show this help dialog</dd>
+                <dt>S</dt>
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+                <dt>&larrb;</dt>
+                <dd>Move up in search results</dd>
+                <dt>&rarrb;</dt>
+                <dd>Move down in search results</dd>
+                <dt>&#9166;</dt>
+                <dd>Go to active search result</dd>
+            </dl>
+        </div>
+        <div class="infos">
+            <h1>Search tricks</h1>
+            <p>
+                Prefix searches with a type followed by a colon (e.g.
+                <code>fn:</code>) to restrict the search to a given type.
+            </p>
+            <p>
+                Accepted types are: <code>fn</code>, <code>mod</code>,
+                <code>struct</code>, <code>enum</code>,
+                <code>trait</code>, <code>typedef</code> (or
+                <code>tdef</code>).
+            </p>
+            <p>
+                Search functions by type signature (e.g.
+                <code>vec -> usize</code>)
+            </p>
+        </div>
+    </div>
+
+    
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+    <script>
+        window.rootPath = "../../";
+        window.currentCrate = "carboxyl";
+        window.playgroundUrl = "";
+    </script>
+    <script src="../../jquery.js"></script>
+    <script src="../../main.js"></script>
+    
+    <script async src="../../search-index.js"></script>
+</body>
+</html>
+\ No newline at end of file
diff --git a/src/carboxyl/pending.rs.html b/src/carboxyl/pending.rs.html
new file mode 100644
index 0000000..6e0f11f
--- /dev/null
+++ b/src/carboxyl/pending.rs.html
@@ -0,0 +1,271 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta name="generator" content="rustdoc">
+    <meta name="description" content="Source to the Rust file `/home/travis/.cargo/registry/src/github.com-0a35038f75765ae4/carboxyl-0.1.1/src/pending.rs`.">
+    <meta name="keywords" content="rust, rustlang, rust-lang">
+
+    <title>pending.rs.html -- source</title>
+
+    <link rel="stylesheet" type="text/css" href="../../main.css">
+
+    
+    
+</head>
+<body class="rustdoc">
+    <!--[if lte IE 8]>
+    <div class="warning">
+        This old browser is unsupported and will most likely display funky
+        things.
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+    <![endif]-->
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+        
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+    <nav class="sub">
+        <form class="search-form js-only">
+            <div class="search-container">
+                <input class="search-input" name="search"
+                       autocomplete="off"
+                       placeholder="Click or press 'S' to search, '?' for more options..."
+                       type="search">
+            </div>
+        </form>
+    </nav>
+
+    <section id='main' class="content source"><pre class="line-numbers"><span id="1"> 1</span>
+<span id="2"> 2</span>
+<span id="3"> 3</span>
+<span id="4"> 4</span>
+<span id="5"> 5</span>
+<span id="6"> 6</span>
+<span id="7"> 7</span>
+<span id="8"> 8</span>
+<span id="9"> 9</span>
+<span id="10">10</span>
+<span id="11">11</span>
+<span id="12">12</span>
+<span id="13">13</span>
+<span id="14">14</span>
+<span id="15">15</span>
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+<span id="19">19</span>
+<span id="20">20</span>
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+<span id="22">22</span>
+<span id="23">23</span>
+<span id="24">24</span>
+<span id="25">25</span>
+<span id="26">26</span>
+<span id="27">27</span>
+<span id="28">28</span>
+<span id="29">29</span>
+<span id="30">30</span>
+<span id="31">31</span>
+<span id="32">32</span>
+<span id="33">33</span>
+<span id="34">34</span>
+<span id="35">35</span>
+<span id="36">36</span>
+<span id="37">37</span>
+<span id="38">38</span>
+<span id="39">39</span>
+<span id="40">40</span>
+<span id="41">41</span>
+<span id="42">42</span>
+<span id="43">43</span>
+<span id="44">44</span>
+<span id="45">45</span>
+<span id="46">46</span>
+<span id="47">47</span>
+<span id="48">48</span>
+<span id="49">49</span>
+<span id="50">50</span>
+<span id="51">51</span>
+<span id="52">52</span>
+<span id="53">53</span>
+<span id="54">54</span>
+<span id="55">55</span>
+<span id="56">56</span>
+<span id="57">57</span>
+<span id="58">58</span>
+<span id="59">59</span>
+<span id="60">60</span>
+<span id="61">61</span>
+<span id="62">62</span>
+<span id="63">63</span>
+<span id="64">64</span>
+<span id="65">65</span>
+<span id="66">66</span>
+<span id="67">67</span>
+<span id="68">68</span>
+<span id="69">69</span>
+<span id="70">70</span>
+<span id="71">71</span>
+<span id="72">72</span>
+<span id="73">73</span>
+<span id="74">74</span>
+<span id="75">75</span>
+<span id="76">76</span>
+<span id="77">77</span>
+<span id="78">78</span>
+<span id="79">79</span>
+<span id="80">80</span>
+<span id="81">81</span>
+<span id="82">82</span>
+<span id="83">83</span>
+<span id="84">84</span>
+<span id="85">85</span>
+<span id="86">86</span>
+<span id="87">87</span>
+</pre><pre class='rust '>
+<span class='doccomment'>//! Pending wrapper</span>
+
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ops</span>::<span class='ident'>Deref</span>;
+
+
+<span class='doccomment'>/// A pending value. This is a wrapper type that allows one to queue one new</span>
+<span class='doccomment'>/// value without actually overwriting the old value. Later the most recently</span>
+<span class='doccomment'>/// queued value can be updated.</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Pending</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> {
+    <span class='ident'>current</span>: <span class='ident'>T</span>,
+    <span class='ident'>update</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span>,
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> <span class='ident'>Pending</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> {
+    <span class='doccomment'>/// Create a new pending value.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>t</span>: <span class='ident'>T</span>) <span class='op'>-&gt;</span> <span class='ident'>Pending</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> {
+        <span class='ident'>Pending</span> { <span class='ident'>current</span>: <span class='ident'>t</span>, <span class='ident'>update</span>: <span class='prelude-val'>None</span> }
+    }
+
+    <span class='doccomment'>/// Put an item in the queue. Ignores any previously queued items.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>queue</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>new</span>: <span class='ident'>T</span>) {
+        <span class='self'>self</span>.<span class='ident'>update</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='ident'>new</span>);
+    }
+
+    <span class='doccomment'>/// Updates any update pending.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>update</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) {
+        <span class='kw'>if</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>(<span class='ident'>t</span>) <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>update</span>.<span class='ident'>take</span>() {
+            <span class='self'>self</span>.<span class='ident'>current</span> <span class='op'>=</span> <span class='ident'>t</span>;
+        }
+    }
+
+    <span class='doccomment'>/// Get the future value.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>future</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>T</span> {
+        <span class='self'>self</span>.<span class='ident'>update</span>.<span class='ident'>as_ref</span>().<span class='ident'>unwrap_or</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>current</span>)
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> <span class='ident'>Deref</span> <span class='kw'>for</span> <span class='ident'>Pending</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> {
+    <span class='kw'>type</span> <span class='ident'>Target</span> <span class='op'>=</span> <span class='ident'>T</span>;
+    <span class='kw'>fn</span> <span class='ident'>deref</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>T</span> { <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>current</span> }
+}
+
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>mod</span> <span class='ident'>test</span> {
+    <span class='kw'>use</span> <span class='ident'>super</span>::<span class='op'>*</span>;
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>new_derefs_identical</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='op'>*</span><span class='ident'>Pending</span>::<span class='ident'>new</span>(<span class='number'>3</span>), <span class='number'>3</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>queue_does_not_affect_deref</span>() {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>p</span> <span class='op'>=</span> <span class='ident'>Pending</span>::<span class='ident'>new</span>(<span class='number'>2</span>);
+        <span class='ident'>p</span>.<span class='ident'>queue</span>(<span class='number'>4</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='op'>*</span><span class='ident'>p</span>, <span class='number'>2</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>new_future_identical</span>() {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='op'>*</span><span class='ident'>Pending</span>::<span class='ident'>new</span>(<span class='number'>5</span>).<span class='ident'>future</span>(), <span class='number'>5</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>queue_affects_future</span>() {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>p</span> <span class='op'>=</span> <span class='ident'>Pending</span>::<span class='ident'>new</span>(<span class='number'>10</span>);
+        <span class='ident'>p</span>.<span class='ident'>queue</span>(<span class='number'>6</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='op'>*</span><span class='ident'>p</span>.<span class='ident'>future</span>(), <span class='number'>6</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>updated_deref</span>() {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>p</span> <span class='op'>=</span> <span class='ident'>Pending</span>::<span class='ident'>new</span>(<span class='op'>-</span><span class='number'>2</span>);
+        <span class='ident'>p</span>.<span class='ident'>queue</span>(<span class='number'>2</span>);
+        <span class='ident'>p</span>.<span class='ident'>update</span>();
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='op'>*</span><span class='ident'>p</span>, <span class='number'>2</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>updated_future</span>() {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>p</span> <span class='op'>=</span> <span class='ident'>Pending</span>::<span class='ident'>new</span>(<span class='op'>-</span><span class='number'>7</span>);
+        <span class='ident'>p</span>.<span class='ident'>queue</span>(<span class='number'>0</span>);
+        <span class='ident'>p</span>.<span class='ident'>update</span>();
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='op'>*</span><span class='ident'>p</span>.<span class='ident'>future</span>(), <span class='number'>0</span>);
+    }
+}
+</pre>
+</section>
+    <section id='search' class="content hidden"></section>
+
+    <section class="footer"></section>
+
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+        <div class="shortcuts">
+            <h1>Keyboard shortcuts</h1>
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+            <p>
+                Prefix searches with a type followed by a colon (e.g.
+                <code>fn:</code>) to restrict the search to a given type.
+            </p>
+            <p>
+                Accepted types are: <code>fn</code>, <code>mod</code>,
+                <code>struct</code>, <code>enum</code>,
+                <code>trait</code>, <code>typedef</code> (or
+                <code>tdef</code>).
+            </p>
+            <p>
+                Search functions by type signature (e.g.
+                <code>vec -> usize</code>)
+            </p>
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+\ No newline at end of file
diff --git a/src/carboxyl/readonly.rs.html b/src/carboxyl/readonly.rs.html
new file mode 100644
index 0000000..84fce7f
--- /dev/null
+++ b/src/carboxyl/readonly.rs.html
@@ -0,0 +1,173 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta name="generator" content="rustdoc">
+    <meta name="description" content="Source to the Rust file `/home/travis/.cargo/registry/src/github.com-0a35038f75765ae4/carboxyl-0.1.1/src/readonly.rs`.">
+    <meta name="keywords" content="rust, rustlang, rust-lang">
+
+    <title>readonly.rs.html -- source</title>
+
+    <link rel="stylesheet" type="text/css" href="../../main.css">
+
+    
+    
+</head>
+<body class="rustdoc">
+    <!--[if lte IE 8]>
+    <div class="warning">
+        This old browser is unsupported and will most likely display funky
+        things.
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+        <form class="search-form js-only">
+            <div class="search-container">
+                <input class="search-input" name="search"
+                       autocomplete="off"
+                       placeholder="Click or press 'S' to search, '?' for more options..."
+                       type="search">
+            </div>
+        </form>
+    </nav>
+
+    <section id='main' class="content source"><pre class="line-numbers"><span id="1"> 1</span>
+<span id="2"> 2</span>
+<span id="3"> 3</span>
+<span id="4"> 4</span>
+<span id="5"> 5</span>
+<span id="6"> 6</span>
+<span id="7"> 7</span>
+<span id="8"> 8</span>
+<span id="9"> 9</span>
+<span id="10">10</span>
+<span id="11">11</span>
+<span id="12">12</span>
+<span id="13">13</span>
+<span id="14">14</span>
+<span id="15">15</span>
+<span id="16">16</span>
+<span id="17">17</span>
+<span id="18">18</span>
+<span id="19">19</span>
+<span id="20">20</span>
+<span id="21">21</span>
+<span id="22">22</span>
+<span id="23">23</span>
+<span id="24">24</span>
+<span id="25">25</span>
+<span id="26">26</span>
+<span id="27">27</span>
+<span id="28">28</span>
+<span id="29">29</span>
+<span id="30">30</span>
+<span id="31">31</span>
+<span id="32">32</span>
+<span id="33">33</span>
+<span id="34">34</span>
+<span id="35">35</span>
+<span id="36">36</span>
+<span id="37">37</span>
+<span id="38">38</span>
+</pre><pre class='rust '>
+<span class='doccomment'>//! Thread-safe read-only smart pointer.</span>
+
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::{ <span class='ident'>Arc</span>, <span class='ident'>RwLock</span>, <span class='ident'>RwLockReadGuard</span> };
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ops</span>::<span class='ident'>Deref</span>;
+
+<span class='doccomment'>/// Guards read-access into a read-only pointer.</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>ReadOnlyGuard</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>T</span>: <span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
+    <span class='ident'>guard</span>: <span class='ident'>RwLockReadGuard</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>T</span><span class='op'>&gt;</span>,
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>T</span><span class='op'>&gt;</span> <span class='ident'>Deref</span> <span class='kw'>for</span> <span class='ident'>ReadOnlyGuard</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span>, <span class='ident'>T</span><span class='op'>&gt;</span> {
+    <span class='kw'>type</span> <span class='ident'>Target</span> <span class='op'>=</span> <span class='ident'>T</span>;
+    <span class='kw'>fn</span> <span class='ident'>deref</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>T</span> { <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>guard</span> }
+}
+
+<span class='doccomment'>/// A thread-safe read-only smart pointer.</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>ReadOnly</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> {
+    <span class='ident'>ptr</span>: <span class='ident'>Arc</span><span class='op'>&lt;</span><span class='ident'>RwLock</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;&gt;</span>,
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> <span class='ident'>Clone</span> <span class='kw'>for</span> <span class='ident'>ReadOnly</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> {
+    <span class='kw'>fn</span> <span class='ident'>clone</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>ReadOnly</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> {
+        <span class='ident'>ReadOnly</span> { <span class='ident'>ptr</span>: <span class='self'>self</span>.<span class='ident'>ptr</span>.<span class='ident'>clone</span>() }
+    }
+}
+
+<span class='doccomment'>/// Create a new read-only pointer.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>create</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span>(<span class='ident'>ptr</span>: <span class='ident'>Arc</span><span class='op'>&lt;</span><span class='ident'>RwLock</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>ReadOnly</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> { <span class='ident'>ReadOnly</span> { <span class='ident'>ptr</span>: <span class='ident'>ptr</span> } }
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> <span class='ident'>ReadOnly</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span> {
+    <span class='doccomment'>/// Gain read-access to the stored value.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// In case, the underlying data structure has been poisoned, it returns</span>
+    <span class='doccomment'>/// `None`.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>read</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>ReadOnlyGuard</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;&gt;</span> {
+        <span class='self'>self</span>.<span class='ident'>ptr</span>.<span class='ident'>read</span>().<span class='ident'>ok</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>g</span><span class='op'>|</span> <span class='ident'>ReadOnlyGuard</span> { <span class='ident'>guard</span>: <span class='ident'>g</span> })
+    }
+}
+</pre>
+</section>
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+    <section id='main' class="content source"><pre class="line-numbers"><span id="1">  1</span>
+<span id="2">  2</span>
+<span id="3">  3</span>
+<span id="4">  4</span>
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+<span id="684">684</span>
+<span id="685">685</span>
+<span id="686">686</span>
+<span id="687">687</span>
+<span id="688">688</span>
+<span id="689">689</span>
+<span id="690">690</span>
+<span id="691">691</span>
+<span id="692">692</span>
+<span id="693">693</span>
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+<span id="702">702</span>
+<span id="703">703</span>
+<span id="704">704</span>
+<span id="705">705</span>
+<span id="706">706</span>
+<span id="707">707</span>
+<span id="708">708</span>
+<span id="709">709</span>
+<span id="710">710</span>
+<span id="711">711</span>
+<span id="712">712</span>
+<span id="713">713</span>
+<span id="714">714</span>
+<span id="715">715</span>
+<span id="716">716</span>
+<span id="717">717</span>
+<span id="718">718</span>
+<span id="719">719</span>
+<span id="720">720</span>
+<span id="721">721</span>
+<span id="722">722</span>
+<span id="723">723</span>
+<span id="724">724</span>
+<span id="725">725</span>
+<span id="726">726</span>
+<span id="727">727</span>
+<span id="728">728</span>
+<span id="729">729</span>
+<span id="730">730</span>
+<span id="731">731</span>
+<span id="732">732</span>
+<span id="733">733</span>
+<span id="734">734</span>
+<span id="735">735</span>
+<span id="736">736</span>
+<span id="737">737</span>
+<span id="738">738</span>
+<span id="739">739</span>
+<span id="740">740</span>
+<span id="741">741</span>
+<span id="742">742</span>
+<span id="743">743</span>
+<span id="744">744</span>
+<span id="745">745</span>
+<span id="746">746</span>
+<span id="747">747</span>
+<span id="748">748</span>
+<span id="749">749</span>
+<span id="750">750</span>
+<span id="751">751</span>
+<span id="752">752</span>
+</pre><pre class='rust '>
+<span class='doccomment'>//! Continuous time signals</span>
+
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::{ <span class='ident'>Arc</span>, <span class='ident'>Mutex</span>, <span class='ident'>RwLock</span> };
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ops</span>::<span class='ident'>Deref</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fmt</span>;
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>use</span> <span class='ident'>quickcheck</span>::{ <span class='ident'>Arbitrary</span>, <span class='ident'>Gen</span> };
+
+<span class='kw'>use</span> <span class='ident'>source</span>::{ <span class='ident'>Source</span>, <span class='ident'>with_weak</span>, <span class='ident'>CallbackError</span> };
+<span class='kw'>use</span> <span class='ident'>stream</span>::{ <span class='self'>self</span>, <span class='ident'>BoxClone</span>, <span class='ident'>Stream</span> };
+<span class='kw'>use</span> <span class='ident'>transaction</span>::{ <span class='ident'>commit</span>, <span class='ident'>end</span> };
+<span class='kw'>use</span> <span class='ident'>pending</span>::<span class='ident'>Pending</span>;
+<span class='kw'>use</span> <span class='ident'>readonly</span>::{ <span class='self'>self</span>, <span class='ident'>ReadOnly</span> };
+<span class='kw'>use</span> <span class='ident'>lift</span>;
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>use</span> <span class='ident'>testing</span>::<span class='ident'>ArcFn</span>;
+
+
+<span class='doccomment'>/// A functional signal. Caches its return value during a transaction.</span>
+<span class='kw'>struct</span> <span class='ident'>FuncSignal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='ident'>func</span>: <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>Fn</span>() <span class='op'>-&gt;</span> <span class='ident'>A</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span>,
+    <span class='ident'>cache</span>: <span class='ident'>Arc</span><span class='op'>&lt;</span><span class='ident'>Mutex</span><span class='op'>&lt;</span><span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;&gt;</span><span class='op'>&gt;</span>,
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> <span class='ident'>FuncSignal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span><span class='op'>&lt;</span><span class='ident'>F</span>: <span class='ident'>Fn</span>() <span class='op'>-&gt;</span> <span class='ident'>A</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span>(<span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>FuncSignal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='ident'>FuncSignal</span> {
+            <span class='ident'>func</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>f</span>),
+            <span class='ident'>cache</span>: <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>Mutex</span>::<span class='ident'>new</span>(<span class='prelude-val'>None</span>)),
+        }
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span> <span class='ident'>FuncSignal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='doccomment'>/// Call the function or fetch the cached value if present.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>call</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>A</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>cached</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>cache</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>();
+        <span class='kw'>match</span> <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='op'>*</span><span class='ident'>cached</span> {
+            <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='prelude-val'>Some</span>(<span class='kw-2'>ref</span> <span class='ident'>value</span>) <span class='op'>=&gt;</span> <span class='ident'>value</span>.<span class='ident'>clone</span>(),
+            <span class='ident'>cached</span> <span class='op'>=&gt;</span> {
+                <span class='comment'>// Register callback to reset cache at the end of the transaction</span>
+                <span class='kw'>let</span> <span class='ident'>cache</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>cache</span>.<span class='ident'>clone</span>();
+                <span class='ident'>end</span>(<span class='kw'>move</span> <span class='op'>||</span> {
+                    <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>live</span> <span class='op'>=</span> <span class='ident'>cache</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>();
+                    <span class='op'>*</span><span class='ident'>live</span> <span class='op'>=</span> <span class='prelude-val'>None</span>;
+                });
+                <span class='comment'>// Calculate &amp; cache value</span>
+                <span class='kw'>let</span> <span class='ident'>value</span> <span class='op'>=</span> (<span class='self'>self</span>.<span class='ident'>func</span>)();
+                <span class='op'>*</span><span class='ident'>cached</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='ident'>value</span>.<span class='ident'>clone</span>());
+                <span class='ident'>value</span>
+            },
+        }
+    }
+}
+
+
+<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>SignalFn</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='ident'>Const</span>(<span class='ident'>A</span>),
+    <span class='ident'>Func</span>(<span class='ident'>FuncSignal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>),
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> <span class='ident'>SignalFn</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>from_fn</span><span class='op'>&lt;</span><span class='ident'>F</span>: <span class='ident'>Fn</span>() <span class='op'>-&gt;</span> <span class='ident'>A</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span>(<span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>SignalFn</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='ident'>SignalFn</span>::<span class='ident'>Func</span>(<span class='ident'>FuncSignal</span>::<span class='ident'>new</span>(<span class='ident'>f</span>))
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span> <span class='ident'>SignalFn</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>call</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>A</span> {
+        <span class='kw'>match</span> <span class='op'>*</span><span class='self'>self</span> {
+            <span class='ident'>SignalFn</span>::<span class='ident'>Const</span>(<span class='kw-2'>ref</span> <span class='ident'>a</span>) <span class='op'>=&gt;</span> <span class='ident'>a</span>.<span class='ident'>clone</span>(),
+            <span class='ident'>SignalFn</span>::<span class='ident'>Func</span>(<span class='kw-2'>ref</span> <span class='ident'>f</span>) <span class='op'>=&gt;</span> <span class='ident'>f</span>.<span class='ident'>call</span>(),
+        }
+    }
+}
+
+
+<span class='doccomment'>/// Helper function to register callback handlers related to signal construction.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>reg_signal</span><span class='op'>&lt;</span><span class='ident'>A</span>, <span class='ident'>B</span>, <span class='ident'>F</span><span class='op'>&gt;</span>(<span class='ident'>parent_source</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Source</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>, <span class='ident'>signal</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span>, <span class='ident'>handler</span>: <span class='ident'>F</span>)
+    <span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+          <span class='ident'>B</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+          <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='ident'>A</span>) <span class='op'>-&gt;</span> <span class='ident'>SignalFn</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+{
+    <span class='kw'>let</span> <span class='ident'>weak_source</span> <span class='op'>=</span> <span class='ident'>signal</span>.<span class='ident'>source</span>.<span class='ident'>downgrade</span>();
+    <span class='kw'>let</span> <span class='ident'>weak_current</span> <span class='op'>=</span> <span class='ident'>signal</span>.<span class='ident'>current</span>.<span class='ident'>downgrade</span>();
+    <span class='ident'>parent_source</span>.<span class='ident'>register</span>(<span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span>
+        <span class='ident'>weak_current</span>.<span class='ident'>upgrade</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>cur</span><span class='op'>|</span> <span class='ident'>end</span>(
+            <span class='kw'>move</span> <span class='op'>||</span> { <span class='kw'>let</span> _ <span class='op'>=</span> <span class='ident'>cur</span>.<span class='ident'>write</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='kw-2'>mut</span> <span class='ident'>cur</span><span class='op'>|</span> <span class='ident'>cur</span>.<span class='ident'>update</span>()); }))
+            .<span class='ident'>ok_or</span>(<span class='ident'>CallbackError</span>::<span class='ident'>Disappeared</span>)
+        .<span class='ident'>and</span>(<span class='ident'>with_weak</span>(<span class='kw-2'>&amp;</span><span class='ident'>weak_current</span>, <span class='op'>|</span><span class='ident'>cur</span><span class='op'>|</span> <span class='ident'>cur</span>.<span class='ident'>queue</span>(<span class='ident'>handler</span>(<span class='ident'>a</span>))))
+        .<span class='ident'>and</span>(<span class='ident'>with_weak</span>(<span class='kw-2'>&amp;</span><span class='ident'>weak_source</span>, <span class='op'>|</span><span class='ident'>src</span><span class='op'>|</span> <span class='ident'>src</span>.<span class='ident'>send</span>(())))
+    );
+}
+
+
+<span class='doccomment'>/// External helper function to build a signal.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>signal_build</span><span class='op'>&lt;</span><span class='ident'>A</span>, <span class='ident'>K</span><span class='op'>&gt;</span>(<span class='ident'>func</span>: <span class='ident'>SignalFn</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>, <span class='ident'>keep_alive</span>: <span class='ident'>K</span>) <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>
+        <span class='kw'>where</span> <span class='ident'>K</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>
+{
+    <span class='ident'>Signal</span>::<span class='ident'>build</span>(<span class='ident'>func</span>, <span class='ident'>keep_alive</span>)
+}
+
+<span class='doccomment'>/// External accessor to current state of a signal.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>signal_current</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>(<span class='ident'>signal</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>Arc</span><span class='op'>&lt;</span><span class='ident'>RwLock</span><span class='op'>&lt;</span><span class='ident'>Pending</span><span class='op'>&lt;</span><span class='ident'>SignalFn</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;&gt;</span><span class='op'>&gt;&gt;</span> {
+    <span class='kw-2'>&amp;</span><span class='ident'>signal</span>.<span class='ident'>current</span>
+}
+
+<span class='doccomment'>/// External accessor to signal source.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>signal_source</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>(<span class='ident'>signal</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>Arc</span><span class='op'>&lt;</span><span class='ident'>RwLock</span><span class='op'>&lt;</span><span class='ident'>Source</span><span class='op'>&lt;</span>()<span class='op'>&gt;&gt;</span><span class='op'>&gt;</span> {
+    <span class='kw-2'>&amp;</span><span class='ident'>signal</span>.<span class='ident'>source</span>
+}
+
+<span class='doccomment'>/// Sample the value of the signal without committing it as a transaction.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>sample_raw</span><span class='op'>&lt;</span><span class='ident'>A</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span>(<span class='ident'>signal</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>A</span> {
+    <span class='ident'>signal</span>.<span class='ident'>current</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>().<span class='ident'>call</span>()
+}
+
+
+<span class='doccomment'>/// A continuous signal that changes over time.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Signals can be thought of as values that change over time. They have both a</span>
+<span class='doccomment'>/// continuous and a discrete component. This means that their current value is</span>
+<span class='doccomment'>/// defined by a function that can be called at any time. That function is only</span>
+<span class='doccomment'>/// evaluated on-demand, when the signal&#39;s current value is sampled. (This is</span>
+<span class='doccomment'>/// also called pull semantics in the literature on FRP.)</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// In addition, the current function used to sample a signal may change</span>
+<span class='doccomment'>/// discretely in reaction to some event. For instance, it is possible to create</span>
+<span class='doccomment'>/// a signal from an event stream, by holding the last event occurence as the</span>
+<span class='doccomment'>/// current value of the stream.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// # Algebraic laws</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Signals come with some primitive methods to compose them with each other and</span>
+<span class='doccomment'>/// with streams. Some of these primitives give the signals an algebraic</span>
+<span class='doccomment'>/// structure.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// ## Functor</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Signals form a functor under unary lifting. Thus, the following laws hold:</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// - Preservation of identity: `lift!(|x| x, &amp;a) == a`,</span>
+<span class='doccomment'>/// - Function composition: `lift!(|x| g(f(x)), &amp;a) == lift!(g, &amp;lift!(f, &amp;a))`.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// ## Applicative functor</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// By extension, using the notion of a signal of a function, signals also</span>
+<span class='doccomment'>/// become an [applicative][ghc-applicative] using `Signal::new` as `pure` and</span>
+<span class='doccomment'>/// `|sf, sa| lift!(|f, a| f(a), &amp;sf, &amp;sa)` as `&lt;*&gt;`.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// *TODO: Expand on this and replace the Haskell reference.*</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// [ghc-applicative]: https://downloads.haskell.org/~ghc/latest/docs/html/libraries/base/Control-Applicative.html</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='ident'>current</span>: <span class='ident'>Arc</span><span class='op'>&lt;</span><span class='ident'>RwLock</span><span class='op'>&lt;</span><span class='ident'>Pending</span><span class='op'>&lt;</span><span class='ident'>SignalFn</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;&gt;</span><span class='op'>&gt;&gt;</span>,
+    <span class='ident'>source</span>: <span class='ident'>Arc</span><span class='op'>&lt;</span><span class='ident'>RwLock</span><span class='op'>&lt;</span><span class='ident'>Source</span><span class='op'>&lt;</span>()<span class='op'>&gt;&gt;</span><span class='op'>&gt;</span>,
+    <span class='attribute'>#[<span class='ident'>allow</span>(<span class='ident'>dead_code</span>)]</span>
+    <span class='ident'>keep_alive</span>: <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>BoxClone</span><span class='op'>&gt;</span>,
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> <span class='ident'>Clone</span> <span class='kw'>for</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='kw'>fn</span> <span class='ident'>clone</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='ident'>Signal</span> {
+            <span class='ident'>current</span>: <span class='self'>self</span>.<span class='ident'>current</span>.<span class='ident'>clone</span>(),
+            <span class='ident'>source</span>: <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>clone</span>(),
+            <span class='ident'>keep_alive</span>: <span class='self'>self</span>.<span class='ident'>keep_alive</span>.<span class='ident'>box_clone</span>(),
+        }
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='kw'>fn</span> <span class='ident'>build</span><span class='op'>&lt;</span><span class='ident'>K</span><span class='op'>&gt;</span>(<span class='ident'>func</span>: <span class='ident'>SignalFn</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>, <span class='ident'>keep_alive</span>: <span class='ident'>K</span>) <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>
+        <span class='kw'>where</span> <span class='ident'>K</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>
+    {
+        <span class='ident'>Signal</span> {
+            <span class='ident'>current</span>: <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Pending</span>::<span class='ident'>new</span>(<span class='ident'>func</span>))),
+            <span class='ident'>source</span>: <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Source</span>::<span class='ident'>new</span>())),
+            <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>keep_alive</span>),
+        }
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='doccomment'>/// Create a constant signal.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>a</span>: <span class='ident'>A</span>) <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='ident'>Signal</span>::<span class='ident'>build</span>(<span class='ident'>SignalFn</span>::<span class='ident'>Const</span>(<span class='ident'>a</span>), ())
+    }
+
+    <span class='doccomment'>/// Sample the current value of the signal.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>sample</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>A</span> {
+        <span class='ident'>commit</span>(<span class='op'>||</span> <span class='ident'>sample_raw</span>(<span class='self'>self</span>))
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='doccomment'>/// Create a signal with a cyclic definition.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// The closure gets an undefined forward-declaration of a signal. It is</span>
+    <span class='doccomment'>/// supposed to return a self-referential definition of the same signal.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// Sampling the forward-declared signal, before it is properly defined,</span>
+    <span class='doccomment'>/// will cause a run-time panic.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// This pattern is useful to implement accumulators, counters and other</span>
+    <span class='doccomment'>/// loops that depend on the sampling behaviour of a signal before a</span>
+    <span class='doccomment'>/// transaction.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>cyclic</span><span class='op'>&lt;</span><span class='ident'>F</span><span class='op'>&gt;</span>(<span class='ident'>def</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>
+        <span class='kw'>where</span> <span class='ident'>F</span>: <span class='ident'>FnOnce</span>(<span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>
+    {
+        <span class='ident'>commit</span>(<span class='op'>||</span> {
+            <span class='kw'>let</span> <span class='ident'>cycle</span> <span class='op'>=</span> <span class='ident'>SignalCycle</span>::<span class='ident'>new</span>();
+            <span class='kw'>let</span> <span class='ident'>finished</span> <span class='op'>=</span> <span class='ident'>def</span>(<span class='kw-2'>&amp;</span><span class='ident'>cycle</span>);
+            <span class='ident'>cycle</span>.<span class='ident'>define</span>(<span class='ident'>finished</span>)
+        })
+    }
+
+    <span class='doccomment'>/// Combine the signal with a stream in a snapshot.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// `snapshot` creates a new stream given a signal and a stream. Whenever</span>
+    <span class='doccomment'>/// the input stream fires an event, the output stream fires an event</span>
+    <span class='doccomment'>/// created from the signal&#39;s current value and that event using the</span>
+    <span class='doccomment'>/// supplied function.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='doccomment'>/// # use carboxyl::Sink;</span>
+    <span class='doccomment'>/// let sink1: Sink&lt;i32&gt; = Sink::new();</span>
+    <span class='doccomment'>/// let sink2: Sink&lt;f64&gt; = Sink::new();</span>
+    <span class='doccomment'>/// let mut events = sink1.stream().hold(1)</span>
+    <span class='doccomment'>///     .snapshot(&amp;sink2.stream(), |a, b| (a, b))</span>
+    <span class='doccomment'>///     .events();</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// // Updating its signal does not cause the snapshot to fire</span>
+    <span class='doccomment'>/// sink1.send(4);</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// // However sending an event down the stream does</span>
+    <span class='doccomment'>/// sink2.send(3.0);</span>
+    <span class='doccomment'>/// assert_eq!(events.next(), Some((4, 3.0)));</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>snapshot</span><span class='op'>&lt;</span><span class='ident'>B</span>, <span class='ident'>C</span>, <span class='ident'>F</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>stream</span>: <span class='kw-2'>&amp;</span><span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>C</span><span class='op'>&gt;</span>
+        <span class='kw'>where</span> <span class='ident'>B</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+              <span class='ident'>C</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+              <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='ident'>A</span>, <span class='ident'>B</span>) <span class='op'>-&gt;</span> <span class='ident'>C</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+    {
+        <span class='ident'>stream</span>::<span class='ident'>snapshot</span>(<span class='self'>self</span>, <span class='ident'>stream</span>, <span class='ident'>f</span>)
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;&gt;</span> {
+    <span class='doccomment'>/// Switch between signals.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// This transforms a `Signal&lt;Signal&lt;A&gt;&gt;` into a `Signal&lt;A&gt;`. The nested</span>
+    <span class='doccomment'>/// signal can be thought of as a representation of a switch between different</span>
+    <span class='doccomment'>/// input signals, that allows one to change the structure of the dependency</span>
+    <span class='doccomment'>/// graph at run-time. `switch` provides a way to access the inner value of</span>
+    <span class='doccomment'>/// the currently active signal.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// The following example demonstrates how to use this to switch between two</span>
+    <span class='doccomment'>/// input signals based on a `Button` event stream:</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='doccomment'>/// # use carboxyl::Sink;</span>
+    <span class='doccomment'>/// // Button type</span>
+    <span class='doccomment'>/// #[derive(Clone, Show)]</span>
+    <span class='doccomment'>/// enum Button { A, B };</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// // The input sinks</span>
+    <span class='doccomment'>/// let sink_a = Sink::&lt;i32&gt;::new();</span>
+    <span class='doccomment'>/// let sink_b = Sink::&lt;i32&gt;::new();</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// // The button sink</span>
+    <span class='doccomment'>/// let sink_button = Sink::&lt;Button&gt;::new();</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// // Create the output</span>
+    <span class='doccomment'>/// let output = {</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>///     // Hold input sinks in a signal with some initials</span>
+    <span class='doccomment'>///     let channel_a = sink_a.stream().hold(1);</span>
+    <span class='doccomment'>///     let channel_b = sink_b.stream().hold(2);</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>///     // A trivial default channel used before any button event</span>
+    <span class='doccomment'>///     let default_channel = Sink::new().stream().hold(0);</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>///     // Map button to the channel signals, hold with the default channel as</span>
+    <span class='doccomment'>///     // initial value and switch between the signals</span>
+    <span class='doccomment'>///     sink_button</span>
+    <span class='doccomment'>///         .stream()</span>
+    <span class='doccomment'>///         .map(move |b| match b {</span>
+    <span class='doccomment'>///             Button::A =&gt; channel_a.clone(),</span>
+    <span class='doccomment'>///             Button::B =&gt; channel_b.clone(),</span>
+    <span class='doccomment'>///         })</span>
+    <span class='doccomment'>///         .hold(default_channel)</span>
+    <span class='doccomment'>///         .switch()</span>
+    <span class='doccomment'>/// };</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// // In the beginning, output will come from the default channel</span>
+    <span class='doccomment'>/// assert_eq!(output.sample(), 0);</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// // Let&#39;s switch to channel A</span>
+    <span class='doccomment'>/// sink_button.send(Button::A);</span>
+    <span class='doccomment'>/// assert_eq!(output.sample(), 1);</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// // And to channel B</span>
+    <span class='doccomment'>/// sink_button.send(Button::B);</span>
+    <span class='doccomment'>/// assert_eq!(output.sample(), 2);</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// // The channels can change, too, of course</span>
+    <span class='doccomment'>/// for k in 4..13 {</span>
+    <span class='doccomment'>///     sink_b.send(k);</span>
+    <span class='doccomment'>///     assert_eq!(output.sample(), k);</span>
+    <span class='doccomment'>/// }</span>
+    <span class='doccomment'>/// sink_button.send(Button::A);</span>
+    <span class='doccomment'>/// for k in 21..77 {</span>
+    <span class='doccomment'>///     sink_a.send(k);</span>
+    <span class='doccomment'>///     assert_eq!(output.sample(), k);</span>
+    <span class='doccomment'>/// }</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>switch</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='kw'>fn</span> <span class='ident'>make_callback</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>(<span class='ident'>parent</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>SignalFn</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>
+            <span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+        {
+            <span class='comment'>// TODO: use information on inner value</span>
+            <span class='kw'>let</span> <span class='ident'>current_signal</span> <span class='op'>=</span> <span class='ident'>parent</span>.<span class='ident'>current</span>.<span class='ident'>clone</span>();
+            <span class='ident'>SignalFn</span>::<span class='ident'>from_fn</span>(<span class='kw'>move</span> <span class='op'>||</span>
+                <span class='ident'>sample_raw</span>(<span class='kw-2'>&amp;</span><span class='ident'>current_signal</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>().<span class='ident'>call</span>())
+            )
+        }
+        <span class='ident'>commit</span>(<span class='op'>||</span> {
+            <span class='kw'>let</span> <span class='ident'>signal</span> <span class='op'>=</span> <span class='ident'>Signal</span>::<span class='ident'>build</span>(<span class='ident'>make_callback</span>(<span class='self'>self</span>), ());
+            <span class='kw'>let</span> <span class='ident'>parent</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>clone</span>();
+            <span class='ident'>reg_signal</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>(), <span class='kw-2'>&amp;</span><span class='ident'>signal</span>,
+                <span class='kw'>move</span> <span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>make_callback</span>(<span class='kw-2'>&amp;</span><span class='ident'>parent</span>));
+            <span class='ident'>signal</span>
+        })
+    }
+}
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>ArcFn</span><span class='op'>&lt;</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>&gt;&gt;</span>
+    <span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+          <span class='ident'>B</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+{
+    <span class='doccomment'>/// Applicative functionality. Applies a signal of function to a signal of</span>
+    <span class='doccomment'>/// its argument.</span>
+    <span class='kw'>fn</span> <span class='ident'>apply</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>signal</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span> {
+        <span class='ident'>lift</span>::<span class='ident'>lift2</span>(<span class='op'>|</span><span class='ident'>f</span>, <span class='ident'>a</span><span class='op'>|</span> <span class='ident'>f</span>(<span class='ident'>a</span>), <span class='self'>self</span>, <span class='ident'>signal</span>)
+    }
+}
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span>: <span class='ident'>Arbitrary</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span> <span class='ident'>Arbitrary</span> <span class='kw'>for</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='kw'>fn</span> <span class='ident'>arbitrary</span><span class='op'>&lt;</span><span class='ident'>G</span>: <span class='ident'>Gen</span><span class='op'>&gt;</span>(<span class='ident'>g</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>G</span>) <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='kw'>let</span> <span class='ident'>values</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>::<span class='ident'>arbitrary</span>(<span class='ident'>g</span>);
+        <span class='kw'>if</span> <span class='ident'>values</span>.<span class='ident'>is_empty</span>() {
+            <span class='ident'>Signal</span>::<span class='ident'>new</span>(<span class='ident'>Arbitrary</span>::<span class='ident'>arbitrary</span>(<span class='ident'>g</span>))
+        } <span class='kw'>else</span> {
+            <span class='kw'>let</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='ident'>Mutex</span>::<span class='ident'>new</span>(<span class='number'>0</span>);
+            <span class='ident'>lift</span>::<span class='ident'>lift0</span>(<span class='kw'>move</span> <span class='op'>||</span> {
+                <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='ident'>n</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>();
+                <span class='op'>*</span><span class='ident'>n</span> <span class='op'>+=</span> <span class='number'>1</span>;
+                <span class='kw'>if</span> <span class='op'>*</span><span class='ident'>n</span> <span class='op'>&gt;=</span> <span class='ident'>values</span>.<span class='ident'>len</span>() { <span class='op'>*</span><span class='ident'>n</span> <span class='op'>=</span> <span class='number'>0</span> }
+                <span class='ident'>values</span>[<span class='op'>*</span><span class='ident'>n</span>].<span class='ident'>clone</span>()
+            })
+        }
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span>: <span class='ident'>fmt</span>::<span class='ident'>Debug</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span> <span class='ident'>fmt</span>::<span class='ident'>Debug</span> <span class='kw'>for</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>fmt</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span>(), <span class='ident'>fmt</span>::<span class='ident'>Error</span><span class='op'>&gt;</span> {
+        <span class='ident'>commit</span>(<span class='op'>||</span> <span class='kw'>match</span> <span class='op'>*</span><span class='op'>*</span><span class='self'>self</span>.<span class='ident'>current</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>() {
+            <span class='ident'>SignalFn</span>::<span class='ident'>Const</span>(<span class='kw-2'>ref</span> <span class='ident'>a</span>) <span class='op'>=&gt;</span>
+                <span class='ident'>fmt</span>.<span class='ident'>debug_struct</span>(<span class='string'>&quot;Signal::const&quot;</span>).<span class='ident'>field</span>(<span class='string'>&quot;value&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>a</span>).<span class='ident'>finish</span>(),
+            <span class='ident'>SignalFn</span>::<span class='ident'>Func</span>(<span class='kw-2'>ref</span> <span class='ident'>f</span>) <span class='op'>=&gt;</span>
+                <span class='ident'>fmt</span>.<span class='ident'>debug_struct</span>(<span class='string'>&quot;Signal::fn&quot;</span>).<span class='ident'>field</span>(<span class='string'>&quot;current&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>f</span>.<span class='ident'>call</span>()).<span class='ident'>finish</span>(),
+        })
+    }
+}
+
+
+<span class='doccomment'>/// Forward declaration of a signal to create value loops.</span>
+<span class='kw'>struct</span> <span class='ident'>SignalCycle</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='ident'>signal</span>: <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>,
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span> <span class='ident'>SignalCycle</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='doccomment'>/// Forward-declare a new signal.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-&gt;</span> <span class='ident'>SignalCycle</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='kw'>const</span> <span class='ident'>ERR</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> <span class='ident'>str</span> <span class='op'>=</span> <span class='string'>&quot;sampled on forward-declaration of signal&quot;</span>;
+        <span class='ident'>SignalCycle</span> { <span class='ident'>signal</span>: <span class='ident'>Signal</span>::<span class='ident'>build</span>(<span class='ident'>SignalFn</span>::<span class='ident'>from_fn</span>(<span class='op'>||</span> <span class='macro'>panic</span><span class='macro'>!</span>(<span class='ident'>ERR</span>)), ()) }
+    }
+
+    <span class='doccomment'>/// Provide the signal with a definition.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>define</span>(<span class='self'>self</span>, <span class='ident'>definition</span>: <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='doccomment'>/// Generate a callback from the signal definition&#39;s current value.</span>
+        <span class='kw'>fn</span> <span class='ident'>make_callback</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>(<span class='ident'>current_def</span>: <span class='kw-2'>&amp;</span><span class='ident'>Arc</span><span class='op'>&lt;</span><span class='ident'>RwLock</span><span class='op'>&lt;</span><span class='ident'>Pending</span><span class='op'>&lt;</span><span class='ident'>SignalFn</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;&gt;</span><span class='op'>&gt;&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>SignalFn</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>
+            <span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>
+        {
+            <span class='kw'>match</span> <span class='op'>*</span><span class='ident'>current_def</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>().<span class='ident'>future</span>() {
+                <span class='ident'>SignalFn</span>::<span class='ident'>Const</span>(<span class='kw-2'>ref</span> <span class='ident'>a</span>) <span class='op'>=&gt;</span> <span class='ident'>SignalFn</span>::<span class='ident'>Const</span>(<span class='ident'>a</span>.<span class='ident'>clone</span>()),
+                <span class='ident'>SignalFn</span>::<span class='ident'>Func</span>(_) <span class='op'>=&gt;</span> <span class='ident'>SignalFn</span>::<span class='ident'>from_fn</span>({
+                    <span class='kw'>let</span> <span class='ident'>sig</span> <span class='op'>=</span> <span class='ident'>current_def</span>.<span class='ident'>downgrade</span>();
+                    <span class='kw'>move</span> <span class='op'>||</span> {
+                        <span class='kw'>let</span> <span class='ident'>strong</span> <span class='op'>=</span> <span class='ident'>sig</span>.<span class='ident'>upgrade</span>().<span class='ident'>unwrap</span>();
+                        <span class='kw'>let</span> <span class='ident'>ret</span> <span class='op'>=</span> <span class='ident'>strong</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>().<span class='ident'>call</span>();
+                        <span class='ident'>ret</span>
+                    }
+                }),
+            }
+        }
+        <span class='ident'>commit</span>(<span class='kw'>move</span> <span class='op'>||</span> {
+            <span class='op'>*</span><span class='self'>self</span>.<span class='ident'>signal</span>.<span class='ident'>current</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>() <span class='op'>=</span> <span class='ident'>Pending</span>::<span class='ident'>new</span>(<span class='ident'>make_callback</span>(<span class='kw-2'>&amp;</span><span class='ident'>definition</span>.<span class='ident'>current</span>));
+            <span class='kw'>let</span> <span class='ident'>weak_parent</span> <span class='op'>=</span> <span class='ident'>definition</span>.<span class='ident'>current</span>.<span class='ident'>downgrade</span>();
+            <span class='ident'>reg_signal</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>definition</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>(), <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>signal</span>,
+                <span class='kw'>move</span> <span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>make_callback</span>(<span class='kw-2'>&amp;</span><span class='ident'>weak_parent</span>.<span class='ident'>upgrade</span>().<span class='ident'>unwrap</span>()));
+            <span class='ident'>Signal</span> { <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>definition</span>), ..<span class='self'>self</span>.<span class='ident'>signal</span> }
+        })
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> <span class='ident'>Deref</span> <span class='kw'>for</span> <span class='ident'>SignalCycle</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='kw'>type</span> <span class='ident'>Target</span> <span class='op'>=</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>;
+    <span class='kw'>fn</span> <span class='ident'>deref</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> { <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>signal</span> }
+}
+
+
+<span class='doccomment'>/// Signal variant using inner mutability for efficient in-place updates.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// This is the only kind of primitive that allows non-`Clone` types to be</span>
+<span class='doccomment'>/// wrapped into functional reactive abstractions. The API is somewhat different</span>
+<span class='doccomment'>/// from that of a regular signal to accommodate this.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// One cannot directly sample a `SignalMut` as this would require a clone.</span>
+<span class='doccomment'>/// Instead it comes with a couple of adaptor methods that mimick a subset of</span>
+<span class='doccomment'>/// the `Signal` API. However, all functions passed to these methods take the</span>
+<span class='doccomment'>/// argument coming from the `SignalMut` by reference.</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>SignalMut</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='ident'>inner</span>: <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>ReadOnly</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;&gt;</span>,
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span> <span class='ident'>SignalMut</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='doccomment'>/// Semantically the same as `Signal::snapshot`</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// The key difference here is, that the combining function takes its first</span>
+    <span class='doccomment'>/// argument by reference, as it can&#39;t be moved out of the `SignalMut`.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// # Example</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='doccomment'>/// # use carboxyl::Sink;</span>
+    <span class='doccomment'>/// let sink1 = Sink::new();</span>
+    <span class='doccomment'>/// let sink2 = Sink::new();</span>
+    <span class='doccomment'>/// // Collect values in a mutable `Vec`</span>
+    <span class='doccomment'>/// let values = sink1.stream().scan_mut(vec![], |v, a| v.push(a));</span>
+    <span class='doccomment'>/// // Snapshot some value from it</span>
+    <span class='doccomment'>/// let mut index = values.snapshot(&amp;sink2.stream(),</span>
+    <span class='doccomment'>///     |v, k| v.get(k).map(|x| *x)</span>
+    <span class='doccomment'>/// ).events();</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// sink1.send(4);</span>
+    <span class='doccomment'>/// sink1.send(5);</span>
+    <span class='doccomment'>/// sink2.send(0);</span>
+    <span class='doccomment'>/// assert_eq!(index.next(), Some(Some(4)));</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// sink2.send(1);</span>
+    <span class='doccomment'>/// assert_eq!(index.next(), Some(Some(5)));</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// sink2.send(2);</span>
+    <span class='doccomment'>/// assert_eq!(index.next(), Some(None));</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>snapshot</span><span class='op'>&lt;</span><span class='ident'>B</span>, <span class='ident'>C</span>, <span class='ident'>F</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>stream</span>: <span class='kw-2'>&amp;</span><span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>C</span><span class='op'>&gt;</span>
+        <span class='kw'>where</span> <span class='ident'>B</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+              <span class='ident'>C</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+              <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='kw-2'>&amp;</span><span class='ident'>A</span>, <span class='ident'>B</span>) <span class='op'>-&gt;</span> <span class='ident'>C</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+    {
+        <span class='self'>self</span>.<span class='ident'>inner</span>.<span class='ident'>snapshot</span>(<span class='ident'>stream</span>, <span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> <span class='ident'>f</span>(<span class='kw-2'>&amp;</span><span class='ident'>a</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>(), <span class='ident'>b</span>))
+    }
+
+    <span class='doccomment'>/// Similar to `lift2`. Combines a `SignalMut` with a `Signal` using a</span>
+    <span class='doccomment'>/// function. The function takes its first argument by reference.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>combine</span><span class='op'>&lt;</span><span class='ident'>B</span>, <span class='ident'>C</span>, <span class='ident'>F</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>signal</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>C</span><span class='op'>&gt;</span>
+        <span class='kw'>where</span> <span class='ident'>B</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+              <span class='ident'>C</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+              <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='kw-2'>&amp;</span><span class='ident'>A</span>, <span class='ident'>B</span>) <span class='op'>-&gt;</span> <span class='ident'>C</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+    {
+        <span class='ident'>lift</span>::<span class='ident'>lift2</span>(
+            <span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> <span class='ident'>f</span>(<span class='kw-2'>&amp;</span><span class='ident'>a</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>(), <span class='ident'>b</span>),
+            <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>inner</span>, <span class='kw-2'>&amp;</span><span class='ident'>signal</span>
+        )
+    }
+
+    <span class='doccomment'>/// Similar to `lift2`, but combines two `SignalMut` using a function. The</span>
+    <span class='doccomment'>/// supplied function takes both arguments by reference.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// # Example</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='doccomment'>/// # use carboxyl::Sink;</span>
+    <span class='doccomment'>/// let sink: Sink&lt;i32&gt; = Sink::new();</span>
+    <span class='doccomment'>/// let sum = sink.stream().scan_mut(0, |sum, a| *sum += a);</span>
+    <span class='doccomment'>/// let product = sink.stream().scan_mut(1, |prod, a| *prod *= a);</span>
+    <span class='doccomment'>/// let combo = sum.combine_mut(&amp;product, |s, p| (*s, *p));</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// sink.send(1);</span>
+    <span class='doccomment'>/// assert_eq!(combo.sample(), (1, 1));</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// sink.send(3);</span>
+    <span class='doccomment'>/// assert_eq!(combo.sample(), (4, 3));</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// sink.send(5);</span>
+    <span class='doccomment'>/// assert_eq!(combo.sample(), (9, 15));</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>combine_mut</span><span class='op'>&lt;</span><span class='ident'>B</span>, <span class='ident'>C</span>, <span class='ident'>F</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>SignalMut</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>C</span><span class='op'>&gt;</span>
+        <span class='kw'>where</span> <span class='ident'>B</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+              <span class='ident'>C</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+              <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='kw-2'>&amp;</span><span class='ident'>A</span>, <span class='kw-2'>&amp;</span><span class='ident'>B</span>) <span class='op'>-&gt;</span> <span class='ident'>C</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+    {
+        <span class='ident'>lift</span>::<span class='ident'>lift2</span>(
+            <span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> <span class='ident'>f</span>(<span class='kw-2'>&amp;</span><span class='ident'>a</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>(), <span class='kw-2'>&amp;</span><span class='ident'>b</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>()),
+            <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>inner</span>, <span class='kw-2'>&amp;</span><span class='ident'>other</span>.<span class='ident'>inner</span>
+        )
+    }
+}
+
+
+<span class='doccomment'>/// Same as Stream::hold.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>hold</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>(<span class='ident'>initial</span>: <span class='ident'>A</span>, <span class='ident'>stream</span>: <span class='kw-2'>&amp;</span><span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>
+    <span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+{
+    <span class='ident'>commit</span>(<span class='op'>||</span> {
+        <span class='kw'>let</span> <span class='ident'>signal</span> <span class='op'>=</span> <span class='ident'>Signal</span>::<span class='ident'>build</span>(<span class='ident'>SignalFn</span>::<span class='ident'>Const</span>(<span class='ident'>initial</span>), <span class='ident'>stream</span>.<span class='ident'>clone</span>());
+        <span class='ident'>reg_signal</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>stream</span>::<span class='ident'>source</span>(<span class='kw-2'>&amp;</span><span class='ident'>stream</span>).<span class='ident'>write</span>().<span class='ident'>unwrap</span>(), <span class='kw-2'>&amp;</span><span class='ident'>signal</span>, <span class='ident'>SignalFn</span>::<span class='ident'>Const</span>);
+        <span class='ident'>signal</span>
+    })
+}
+
+
+<span class='doccomment'>/// Same as Stream::scan_mut.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>scan_mut</span><span class='op'>&lt;</span><span class='ident'>A</span>, <span class='ident'>B</span>, <span class='ident'>F</span><span class='op'>&gt;</span>(<span class='ident'>stream</span>: <span class='kw-2'>&amp;</span><span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>, <span class='ident'>initial</span>: <span class='ident'>B</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>SignalMut</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span>
+    <span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+          <span class='ident'>B</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+          <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>B</span>, <span class='ident'>A</span>) <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+{
+    <span class='ident'>commit</span>(<span class='kw'>move</span> <span class='op'>||</span> {
+        <span class='kw'>let</span> <span class='ident'>state</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>initial</span>));
+        <span class='kw'>let</span> <span class='ident'>signal</span> <span class='op'>=</span> <span class='ident'>Signal</span>::<span class='ident'>build</span>(<span class='ident'>SignalFn</span>::<span class='ident'>Const</span>(<span class='ident'>readonly</span>::<span class='ident'>create</span>(<span class='ident'>state</span>.<span class='ident'>clone</span>())), <span class='ident'>stream</span>.<span class='ident'>clone</span>());
+        <span class='ident'>reg_signal</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>stream</span>::<span class='ident'>source</span>(<span class='kw-2'>&amp;</span><span class='ident'>stream</span>).<span class='ident'>write</span>().<span class='ident'>unwrap</span>(), <span class='kw-2'>&amp;</span><span class='ident'>signal</span>,
+            <span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> { <span class='ident'>f</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>state</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>(), <span class='ident'>a</span>); <span class='ident'>SignalFn</span>::<span class='ident'>Const</span>(<span class='ident'>readonly</span>::<span class='ident'>create</span>(<span class='ident'>state</span>.<span class='ident'>clone</span>())) });
+        <span class='ident'>SignalMut</span> { <span class='ident'>inner</span>: <span class='ident'>signal</span> }
+    })
+}
+
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>mod</span> <span class='ident'>test</span> {
+    <span class='kw'>use</span> <span class='ident'>quickcheck</span>::<span class='ident'>quickcheck</span>;
+
+    <span class='kw'>use</span> ::<span class='ident'>stream</span>::<span class='ident'>Sink</span>;
+    <span class='kw'>use</span> ::<span class='ident'>signal</span>::{ <span class='self'>self</span>, <span class='ident'>Signal</span>, <span class='ident'>SignalCycle</span> };
+    <span class='kw'>use</span> ::<span class='ident'>lift</span>::<span class='ident'>lift1</span>;
+    <span class='kw'>use</span> ::<span class='ident'>testing</span>::{ <span class='ident'>ArcFn</span>, <span class='ident'>signal_eq</span>, <span class='ident'>id</span>, <span class='ident'>pure_fn</span>, <span class='ident'>partial_comp</span> };
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>functor_identity</span>() {
+        <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>signal</span>: <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+            <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>signal_eq</span>(<span class='kw-2'>&amp;</span><span class='ident'>signal</span>, <span class='kw-2'>&amp;</span><span class='ident'>lift1</span>(<span class='ident'>id</span>, <span class='kw-2'>&amp;</span><span class='ident'>signal</span>));
+            (<span class='number'>0</span>..<span class='number'>10</span>).<span class='ident'>all</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>eq</span>.<span class='ident'>sample</span>())
+        }
+        <span class='ident'>quickcheck</span>(<span class='ident'>check</span> <span class='kw'>as</span> <span class='kw'>fn</span>(<span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>functor_composition</span>() {
+        <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>signal</span>: <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+            <span class='kw'>fn</span> <span class='ident'>f</span>(<span class='ident'>n</span>: <span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='ident'>i32</span> { <span class='number'>3</span> <span class='op'>*</span> <span class='ident'>n</span> }
+            <span class='kw'>fn</span> <span class='ident'>g</span>(<span class='ident'>n</span>: <span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='ident'>i32</span> { <span class='ident'>n</span> <span class='op'>+</span> <span class='number'>2</span> }
+            <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>signal_eq</span>(
+                <span class='kw-2'>&amp;</span><span class='ident'>lift1</span>(<span class='op'>|</span><span class='ident'>n</span><span class='op'>|</span> <span class='ident'>f</span>(<span class='ident'>g</span>(<span class='ident'>n</span>)), <span class='kw-2'>&amp;</span><span class='ident'>signal</span>),
+                <span class='kw-2'>&amp;</span><span class='ident'>lift1</span>(<span class='ident'>f</span>, <span class='kw-2'>&amp;</span><span class='ident'>lift1</span>(<span class='ident'>g</span>, <span class='kw-2'>&amp;</span><span class='ident'>signal</span>))
+            );
+            (<span class='number'>0</span>..<span class='number'>10</span>).<span class='ident'>all</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>eq</span>.<span class='ident'>sample</span>())
+        }
+        <span class='ident'>quickcheck</span>(<span class='ident'>check</span> <span class='kw'>as</span> <span class='kw'>fn</span>(<span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>applicative_identity</span>() {
+        <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>signal</span>: <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+            <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>signal_eq</span>(<span class='kw-2'>&amp;</span><span class='ident'>pure_fn</span>(<span class='ident'>id</span>).<span class='ident'>apply</span>(<span class='kw-2'>&amp;</span><span class='ident'>signal</span>), <span class='kw-2'>&amp;</span><span class='ident'>signal</span>);
+            (<span class='number'>0</span>..<span class='number'>10</span>).<span class='ident'>all</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>eq</span>.<span class='ident'>sample</span>())
+        }
+        <span class='ident'>quickcheck</span>(<span class='ident'>check</span> <span class='kw'>as</span> <span class='kw'>fn</span>(<span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>applicative_composition</span>() {
+        <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>signal</span>: <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+            <span class='kw'>fn</span> <span class='ident'>f</span>(<span class='ident'>n</span>: <span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='ident'>i32</span> { <span class='ident'>n</span> <span class='op'>*</span> <span class='number'>4</span> }
+            <span class='kw'>fn</span> <span class='ident'>g</span>(<span class='ident'>n</span>: <span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='ident'>i32</span> { <span class='ident'>n</span> <span class='op'>-</span> <span class='number'>3</span> }
+            <span class='kw'>let</span> <span class='ident'>u</span> <span class='op'>=</span> <span class='ident'>pure_fn</span>(<span class='ident'>f</span>);
+            <span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='ident'>pure_fn</span>(<span class='ident'>g</span>);
+            <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>signal_eq</span>(
+                <span class='kw-2'>&amp;</span><span class='ident'>pure_fn</span>(<span class='ident'>partial_comp</span>).<span class='ident'>apply</span>(<span class='kw-2'>&amp;</span><span class='ident'>u</span>).<span class='ident'>apply</span>(<span class='kw-2'>&amp;</span><span class='ident'>v</span>).<span class='ident'>apply</span>(<span class='kw-2'>&amp;</span><span class='ident'>signal</span>),
+                <span class='kw-2'>&amp;</span><span class='ident'>u</span>.<span class='ident'>apply</span>(<span class='kw-2'>&amp;</span><span class='ident'>v</span>.<span class='ident'>apply</span>(<span class='kw-2'>&amp;</span><span class='ident'>signal</span>))
+            );
+            (<span class='number'>0</span>..<span class='number'>10</span>).<span class='ident'>all</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>eq</span>.<span class='ident'>sample</span>())
+        }
+        <span class='ident'>quickcheck</span>(<span class='ident'>check</span> <span class='kw'>as</span> <span class='kw'>fn</span>(<span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>applicative_homomorphism</span>() {
+        <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>x</span>: <span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+            <span class='kw'>fn</span> <span class='ident'>f</span>(<span class='ident'>x</span>: <span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='ident'>i32</span> { <span class='ident'>x</span> <span class='op'>*</span> (<span class='op'>-</span><span class='number'>5</span>) }
+            <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>signal_eq</span>(
+                <span class='kw-2'>&amp;</span><span class='ident'>pure_fn</span>(<span class='ident'>f</span>).<span class='ident'>apply</span>(<span class='kw-2'>&amp;</span><span class='ident'>Signal</span>::<span class='ident'>new</span>(<span class='ident'>x</span>)),
+                <span class='kw-2'>&amp;</span><span class='ident'>Signal</span>::<span class='ident'>new</span>(<span class='ident'>f</span>(<span class='ident'>x</span>))
+            );
+            (<span class='number'>0</span>..<span class='number'>10</span>).<span class='ident'>all</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>eq</span>.<span class='ident'>sample</span>())
+        }
+        <span class='ident'>quickcheck</span>(<span class='ident'>check</span> <span class='kw'>as</span> <span class='kw'>fn</span>(<span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>applicative_interchange</span>() {
+        <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>x</span>: <span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+            <span class='kw'>fn</span> <span class='ident'>f</span>(<span class='ident'>x</span>: <span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='ident'>i32</span> { <span class='ident'>x</span> <span class='op'>*</span> <span class='number'>2</span> <span class='op'>-</span> <span class='number'>7</span> }
+            <span class='kw'>let</span> <span class='ident'>u</span> <span class='op'>=</span> <span class='ident'>pure_fn</span>(<span class='ident'>f</span>);
+            <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>signal_eq</span>(
+                <span class='kw-2'>&amp;</span><span class='ident'>u</span>.<span class='ident'>apply</span>(<span class='kw-2'>&amp;</span><span class='ident'>Signal</span>::<span class='ident'>new</span>(<span class='ident'>x</span>)),
+                <span class='kw-2'>&amp;</span><span class='ident'>pure_fn</span>(<span class='kw'>move</span> <span class='op'>|</span><span class='ident'>f</span>: <span class='ident'>ArcFn</span><span class='op'>&lt;</span><span class='ident'>i32</span>, <span class='ident'>i32</span><span class='op'>&gt;</span><span class='op'>|</span> <span class='ident'>f</span>(<span class='ident'>x</span>)).<span class='ident'>apply</span>(<span class='kw-2'>&amp;</span><span class='ident'>u</span>)
+            );
+            (<span class='number'>0</span>..<span class='number'>10</span>).<span class='ident'>all</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>eq</span>.<span class='ident'>sample</span>())
+        }
+        <span class='ident'>quickcheck</span>(<span class='ident'>check</span> <span class='kw'>as</span> <span class='kw'>fn</span>(<span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>clone</span>() {
+        <span class='kw'>let</span> <span class='ident'>b</span> <span class='op'>=</span> <span class='ident'>Signal</span>::<span class='ident'>new</span>(<span class='number'>3</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>b</span>.<span class='ident'>clone</span>().<span class='ident'>sample</span>(), <span class='number'>3</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>hold</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>signal</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='number'>3</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>signal</span>.<span class='ident'>sample</span>(), <span class='number'>3</span>);
+        <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>4</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>signal</span>.<span class='ident'>sample</span>(), <span class='number'>4</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>hold_implicit_stream</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>signal</span> <span class='op'>=</span> <span class='ident'>signal</span>::<span class='ident'>hold</span>(<span class='number'>0</span>, <span class='kw-2'>&amp;</span><span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>n</span><span class='op'>|</span> <span class='number'>2</span> <span class='op'>*</span> <span class='ident'>n</span>));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>signal</span>.<span class='ident'>sample</span>(), <span class='number'>0</span>);
+        <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>4</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>signal</span>.<span class='ident'>sample</span>(), <span class='number'>8</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>snapshot</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink1</span>: <span class='ident'>Sink</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>sink2</span>: <span class='ident'>Sink</span><span class='op'>&lt;</span><span class='ident'>f64</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>snap_events</span> <span class='op'>=</span> <span class='ident'>sink1</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='number'>1</span>)
+            .<span class='ident'>snapshot</span>(<span class='kw-2'>&amp;</span><span class='ident'>sink2</span>.<span class='ident'>stream</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span> <span class='op'>+</span> <span class='number'>3.0</span>), <span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> (<span class='ident'>a</span>, <span class='ident'>b</span>))
+            .<span class='ident'>events</span>();
+        <span class='ident'>sink2</span>.<span class='ident'>send</span>(<span class='number'>4.0</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>snap_events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>((<span class='number'>1</span>, <span class='number'>7.0</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>snapshot_2</span>() {
+        <span class='kw'>let</span> <span class='ident'>ev1</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>beh1</span> <span class='op'>=</span> <span class='ident'>ev1</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='number'>5</span>);
+        <span class='kw'>let</span> <span class='ident'>ev2</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>snap</span> <span class='op'>=</span> <span class='ident'>beh1</span>.<span class='ident'>snapshot</span>(<span class='kw-2'>&amp;</span><span class='ident'>ev2</span>.<span class='ident'>stream</span>(), <span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> (<span class='ident'>a</span>, <span class='ident'>b</span>));
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>snap</span>.<span class='ident'>events</span>();
+        <span class='ident'>ev2</span>.<span class='ident'>send</span>(<span class='number'>4</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>((<span class='number'>5</span>, <span class='number'>4</span>)));
+        <span class='ident'>ev1</span>.<span class='ident'>send</span>(<span class='op'>-</span><span class='number'>2</span>);
+        <span class='ident'>ev2</span>.<span class='ident'>send</span>(<span class='number'>6</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>((<span class='op'>-</span><span class='number'>2</span>, <span class='number'>6</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>cyclic_snapshot_accum</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>stream</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>();
+        <span class='kw'>let</span> <span class='ident'>accum</span> <span class='op'>=</span> <span class='ident'>SignalCycle</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>def</span> <span class='op'>=</span> <span class='ident'>accum</span>.<span class='ident'>snapshot</span>(<span class='kw-2'>&amp;</span><span class='ident'>stream</span>, <span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>s</span><span class='op'>|</span> <span class='ident'>a</span> <span class='op'>+</span> <span class='ident'>s</span>).<span class='ident'>hold</span>(<span class='number'>0</span>);
+        <span class='kw'>let</span> <span class='ident'>accum</span> <span class='op'>=</span> <span class='ident'>accum</span>.<span class='ident'>define</span>(<span class='ident'>def</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>accum</span>.<span class='ident'>sample</span>(), <span class='number'>0</span>);
+        <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>3</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>accum</span>.<span class='ident'>sample</span>(), <span class='number'>3</span>);
+        <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>7</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>accum</span>.<span class='ident'>sample</span>(), <span class='number'>10</span>);
+        <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='op'>-</span><span class='number'>21</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>accum</span>.<span class='ident'>sample</span>(), <span class='op'>-</span><span class='number'>11</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>snapshot_order_standard</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>signal</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='number'>0</span>);
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>signal</span>
+            .<span class='ident'>snapshot</span>(<span class='kw-2'>&amp;</span><span class='ident'>sink</span>.<span class='ident'>stream</span>(), <span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> (<span class='ident'>a</span>, <span class='ident'>b</span>))
+            .<span class='ident'>events</span>();
+        <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>1</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>((<span class='number'>0</span>, <span class='number'>1</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>snapshot_lift_order_standard</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>signal</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='number'>0</span>);
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>lift1</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span>, <span class='kw-2'>&amp;</span><span class='ident'>signal</span>)
+            .<span class='ident'>snapshot</span>(<span class='kw-2'>&amp;</span><span class='ident'>sink</span>.<span class='ident'>stream</span>(), <span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> (<span class='ident'>a</span>, <span class='ident'>b</span>))
+            .<span class='ident'>events</span>();
+        <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>1</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>((<span class='number'>0</span>, <span class='number'>1</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>snapshot_order_alternative</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='comment'>// Invert the &quot;natural&quot; order of the registry by declaring the stream before</span>
+        <span class='comment'>// the signal, which are both used by the snapshot.</span>
+        <span class='kw'>let</span> <span class='ident'>first</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span>);
+        <span class='kw'>let</span> <span class='ident'>signal</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>hold</span>(<span class='number'>0</span>);
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>signal</span>.<span class='ident'>snapshot</span>(<span class='kw-2'>&amp;</span><span class='ident'>first</span>, <span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> (<span class='ident'>a</span>, <span class='ident'>b</span>)).<span class='ident'>events</span>();
+        <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>1</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>((<span class='number'>0</span>, <span class='number'>1</span>)));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>cyclic_signal_intermediate</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>stream</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>();
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>snap</span> <span class='op'>=</span> <span class='prelude-val'>None</span>;
+        <span class='kw'>let</span> <span class='ident'>sum</span> <span class='op'>=</span> <span class='ident'>Signal</span>::<span class='ident'>cyclic</span>(<span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> {
+            <span class='kw'>let</span> <span class='ident'>my_snap</span> <span class='op'>=</span> <span class='ident'>a</span>.<span class='ident'>snapshot</span>(<span class='kw-2'>&amp;</span><span class='ident'>stream</span>, <span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>e</span><span class='op'>|</span> <span class='ident'>e</span> <span class='op'>+</span> <span class='ident'>a</span>);
+            <span class='ident'>snap</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='ident'>my_snap</span>.<span class='ident'>clone</span>());
+            <span class='ident'>my_snap</span>.<span class='ident'>hold</span>(<span class='number'>0</span>)
+        });
+        <span class='kw'>let</span> <span class='ident'>snap</span> <span class='op'>=</span> <span class='ident'>snap</span>.<span class='ident'>unwrap</span>();
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>snap</span>.<span class='ident'>events</span>();
+
+        <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>3</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>sum</span>.<span class='ident'>sample</span>(), <span class='number'>3</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>3</span>));
+    }
+}
+</pre>
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diff --git a/src/carboxyl/source.rs.html b/src/carboxyl/source.rs.html
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+    <section id='main' class="content source"><pre class="line-numbers"><span id="1">  1</span>
+<span id="2">  2</span>
+<span id="3">  3</span>
+<span id="4">  4</span>
+<span id="5">  5</span>
+<span id="6">  6</span>
+<span id="7">  7</span>
+<span id="8">  8</span>
+<span id="9">  9</span>
+<span id="10"> 10</span>
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+</pre><pre class='rust '>
+<span class='doccomment'>//! Event sources and callbacks.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! This is a light-weight implementation of the observer pattern. Subjects are</span>
+<span class='doccomment'>//! modelled as the `Source` type and observers as boxed closures.</span>
+
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::{ <span class='ident'>RwLock</span>, <span class='ident'>Weak</span> };
+
+<span class='doccomment'>/// An error that can occur with a weakly referenced callback.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>PartialEq</span>, <span class='ident'>Eq</span>, <span class='ident'>Clone</span>, <span class='ident'>Copy</span>, <span class='ident'>Debug</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>CallbackError</span> {
+    <span class='ident'>Disappeared</span>,
+    <span class='ident'>Poisoned</span>,
+}
+
+<span class='doccomment'>/// Shorthand for common callback results.</span>
+<span class='kw'>pub</span> <span class='kw'>type</span> <span class='ident'>CallbackResult</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>=</span>()<span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>T</span>, <span class='ident'>CallbackError</span><span class='op'>&gt;</span>;
+
+<span class='doccomment'>/// A boxed callback.</span>
+<span class='kw'>type</span> <span class='ident'>Callback</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>FnMut</span>(<span class='ident'>A</span>) <span class='op'>-&gt;</span> <span class='ident'>CallbackResult</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span>;
+
+
+<span class='doccomment'>/// Perform some callback on a weak reference to a mutex and handle errors</span>
+<span class='doccomment'>/// gracefully.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>with_weak</span><span class='op'>&lt;</span><span class='ident'>T</span>, <span class='ident'>U</span>, <span class='ident'>F</span>: <span class='ident'>FnOnce</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>T</span>) <span class='op'>-&gt;</span> <span class='ident'>U</span><span class='op'>&gt;</span>(<span class='ident'>weak</span>: <span class='kw-2'>&amp;</span><span class='ident'>Weak</span><span class='op'>&lt;</span><span class='ident'>RwLock</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;&gt;</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>CallbackResult</span><span class='op'>&lt;</span><span class='ident'>U</span><span class='op'>&gt;</span> {
+    <span class='ident'>weak</span>.<span class='ident'>upgrade</span>()
+        .<span class='ident'>ok_or</span>(<span class='ident'>CallbackError</span>::<span class='ident'>Disappeared</span>)
+        .<span class='ident'>and_then</span>(<span class='op'>|</span><span class='ident'>mutex</span><span class='op'>|</span> <span class='ident'>mutex</span>.<span class='ident'>write</span>()
+            .<span class='ident'>map</span>(<span class='op'>|</span><span class='kw-2'>mut</span> <span class='ident'>t</span><span class='op'>|</span> <span class='ident'>f</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>t</span>))
+            .<span class='ident'>map_err</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>CallbackError</span>::<span class='ident'>Poisoned</span>)
+        )
+}
+
+
+<span class='doccomment'>/// An event source.</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Source</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='ident'>callbacks</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>Callback</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;&gt;</span>,
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> <span class='ident'>Source</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='doccomment'>/// Create a new source.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-&gt;</span> <span class='ident'>Source</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='ident'>Source</span> { <span class='ident'>callbacks</span>: <span class='macro'>vec</span><span class='macro'>!</span>[] }
+    }
+
+    <span class='doccomment'>/// Register a callback. The callback will be a mutable closure that takes</span>
+    <span class='doccomment'>/// an event and must return a result. To unsubscribe from further events,</span>
+    <span class='doccomment'>/// the callback has to return an error.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>register</span><span class='op'>&lt;</span><span class='ident'>F</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>callback</span>: <span class='ident'>F</span>)
+        <span class='kw'>where</span> <span class='ident'>F</span>: <span class='ident'>FnMut</span>(<span class='ident'>A</span>) <span class='op'>-&gt;</span> <span class='ident'>CallbackResult</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>
+    {
+        <span class='self'>self</span>.<span class='ident'>callbacks</span>.<span class='ident'>push</span>(<span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>callback</span>));
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span> <span class='ident'>Source</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='doccomment'>/// Make the source send an event to all its observers.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>send</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>a</span>: <span class='ident'>A</span>) {
+        <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>mem</span>;
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>new_callbacks</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>();
+        <span class='ident'>mem</span>::<span class='ident'>swap</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>new_callbacks</span>, <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>.<span class='ident'>callbacks</span>);
+        <span class='self'>self</span>.<span class='ident'>callbacks</span> <span class='op'>=</span> <span class='ident'>new_callbacks</span>
+            .<span class='ident'>into_iter</span>()
+            .<span class='ident'>filter_map</span>(<span class='op'>|</span><span class='kw-2'>mut</span> <span class='ident'>callback</span><span class='op'>|</span> {
+                <span class='kw'>let</span> <span class='ident'>result</span> <span class='op'>=</span> <span class='ident'>callback</span>(<span class='ident'>a</span>.<span class='ident'>clone</span>());
+                <span class='kw'>match</span> <span class='ident'>result</span> {
+                    <span class='prelude-val'>Ok</span>(_) <span class='op'>=&gt;</span> <span class='prelude-val'>Some</span>(<span class='ident'>callback</span>),
+                    <span class='prelude-val'>Err</span>(_) <span class='op'>=&gt;</span> <span class='prelude-val'>None</span>,
+                }
+            })
+            .<span class='ident'>collect</span>();
+    }
+}
+
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>mod</span> <span class='ident'>test</span> {
+    <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::{ <span class='ident'>Arc</span>, <span class='ident'>RwLock</span> };
+    <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>thread</span>;
+    <span class='kw'>use</span> <span class='ident'>super</span>::<span class='op'>*</span>;
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>with_weak_no_error</span>() {
+        <span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='number'>3</span>));
+        <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>a</span>.<span class='ident'>downgrade</span>();
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>with_weak</span>(<span class='kw-2'>&amp;</span><span class='ident'>weak</span>, <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> { <span class='op'>*</span><span class='ident'>a</span> <span class='op'>=</span> <span class='number'>4</span>; }), <span class='prelude-val'>Ok</span>(()));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='op'>*</span><span class='ident'>a</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>(), <span class='number'>4</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>with_weak_disappeared</span>() {
+        <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='number'>3</span>)).<span class='ident'>downgrade</span>();
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>with_weak</span>(<span class='kw-2'>&amp;</span><span class='ident'>weak</span>, <span class='op'>|</span>_<span class='op'>|</span> ()), <span class='prelude-val'>Err</span>(<span class='ident'>CallbackError</span>::<span class='ident'>Disappeared</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>with_weak_poisoned</span>() {
+        <span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='number'>3</span>));
+        <span class='kw'>let</span> <span class='ident'>a2</span> <span class='op'>=</span> <span class='ident'>a</span>.<span class='ident'>clone</span>();
+        <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>a</span>.<span class='ident'>downgrade</span>();
+        <span class='kw'>let</span> _ <span class='op'>=</span> <span class='ident'>thread</span>::<span class='ident'>spawn</span>(<span class='kw'>move</span> <span class='op'>||</span> {
+            <span class='kw'>let</span> <span class='ident'>_g</span> <span class='op'>=</span> <span class='ident'>a2</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>();
+            <span class='macro'>panic</span><span class='macro'>!</span>();
+        }).<span class='ident'>join</span>();
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>with_weak</span>(<span class='kw-2'>&amp;</span><span class='ident'>weak</span>, <span class='op'>|</span>_<span class='op'>|</span> ()), <span class='prelude-val'>Err</span>(<span class='ident'>CallbackError</span>::<span class='ident'>Poisoned</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>source_register_and_send</span>() {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>src</span> <span class='op'>=</span> <span class='ident'>Source</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='number'>3</span>));
+        {
+            <span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>a</span>.<span class='ident'>clone</span>();
+            <span class='ident'>src</span>.<span class='ident'>register</span>(<span class='kw'>move</span> <span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> {
+                <span class='op'>*</span><span class='ident'>a</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>() <span class='op'>=</span> <span class='ident'>x</span>;
+                <span class='prelude-val'>Ok</span>(())
+            });
+        }
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>src</span>.<span class='ident'>callbacks</span>.<span class='ident'>len</span>(), <span class='number'>1</span>);
+        <span class='ident'>src</span>.<span class='ident'>send</span>(<span class='number'>4</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='op'>*</span><span class='ident'>a</span>.<span class='ident'>read</span>().<span class='ident'>unwrap</span>(), <span class='number'>4</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>source_unregister</span>() {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>src</span> <span class='op'>=</span> <span class='ident'>Source</span>::<span class='ident'>new</span>();
+        <span class='ident'>src</span>.<span class='ident'>register</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='prelude-val'>Err</span>(<span class='ident'>CallbackError</span>::<span class='ident'>Disappeared</span>));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>src</span>.<span class='ident'>callbacks</span>.<span class='ident'>len</span>(), <span class='number'>1</span>);
+        <span class='ident'>src</span>.<span class='ident'>send</span>(());
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>src</span>.<span class='ident'>callbacks</span>.<span class='ident'>len</span>(), <span class='number'>0</span>);
+    }
+}
+</pre>
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+
+    <section id='main' class="content source"><pre class="line-numbers"><span id="1">  1</span>
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+<span id="774">774</span>
+</pre><pre class='rust '>
+<span class='doccomment'>//! Streams of discrete events</span>
+
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::{ <span class='ident'>Arc</span>, <span class='ident'>RwLock</span>, <span class='ident'>Mutex</span>, <span class='ident'>Weak</span> };
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::<span class='ident'>mpsc</span>::{ <span class='ident'>Receiver</span>, <span class='ident'>channel</span> };
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>thread</span>;
+<span class='kw'>use</span> <span class='ident'>source</span>::{ <span class='ident'>Source</span>, <span class='ident'>CallbackError</span>, <span class='ident'>CallbackResult</span>, <span class='ident'>with_weak</span> };
+<span class='kw'>use</span> <span class='ident'>signal</span>::{ <span class='self'>self</span>, <span class='ident'>Signal</span>, <span class='ident'>SignalMut</span>, <span class='ident'>sample_raw</span> };
+<span class='kw'>use</span> <span class='ident'>transaction</span>::{ <span class='ident'>commit</span>, <span class='ident'>later</span> };
+
+
+<span class='doccomment'>/// An event sink.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// This primitive is a way of generating streams of events. One can send</span>
+<span class='doccomment'>/// input values into a sink and generate a stream that fires all these inputs</span>
+<span class='doccomment'>/// as events:</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// ```</span>
+<span class='doccomment'>/// # use carboxyl::Sink;</span>
+<span class='doccomment'>/// // A new sink</span>
+<span class='doccomment'>/// let sink = Sink::new();</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// // Make an iterator over a stream.</span>
+<span class='doccomment'>/// let mut events = sink.stream().events();</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// // Send a value into the sink</span>
+<span class='doccomment'>/// sink.send(5);</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// // The stream</span>
+<span class='doccomment'>/// assert_eq!(events.next(), Some(5));</span>
+<span class='doccomment'>/// ```</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// You can also feed a sink with an iterator:</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// ```</span>
+<span class='doccomment'>/// # use carboxyl::Sink;</span>
+<span class='doccomment'>/// # let sink = Sink::new();</span>
+<span class='doccomment'>/// # let mut events = sink.stream().events();</span>
+<span class='doccomment'>/// sink.feed(20..40);</span>
+<span class='doccomment'>/// assert_eq!(events.take(4).collect::&lt;Vec&lt;_&gt;&gt;(), vec![20, 21, 22, 23]);</span>
+<span class='doccomment'>/// ```</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// # Asynchronous calls</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// It is possible to send events into the sink asynchronously using the methods</span>
+<span class='doccomment'>/// `send_async` and `feed_async`. Note though, that this will void some</span>
+<span class='doccomment'>/// guarantees on the order of events. In the following example, it is unclear,</span>
+<span class='doccomment'>/// which event is the first in the stream:</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// ```</span>
+<span class='doccomment'>/// # use carboxyl::Sink;</span>
+<span class='doccomment'>/// let sink = Sink::new();</span>
+<span class='doccomment'>/// let mut events = sink.stream().events();</span>
+<span class='doccomment'>/// sink.send_async(13);</span>
+<span class='doccomment'>/// sink.send_async(22);</span>
+<span class='doccomment'>/// let first = events.next().unwrap();</span>
+<span class='doccomment'>/// assert!(first == 13 || first == 22);</span>
+<span class='doccomment'>/// ```</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// `feed_async` provides a workaround, as it preserves the order of events from</span>
+<span class='doccomment'>/// the iterator. However, any event sent into the sink after a call to it, may</span>
+<span class='doccomment'>/// come at any point between the iterator events.</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Sink</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='ident'>source</span>: <span class='ident'>Arc</span><span class='op'>&lt;</span><span class='ident'>RwLock</span><span class='op'>&lt;</span><span class='ident'>Source</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;&gt;</span><span class='op'>&gt;</span>,
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> <span class='ident'>Clone</span> <span class='kw'>for</span> <span class='ident'>Sink</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='kw'>fn</span> <span class='ident'>clone</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Sink</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='ident'>Sink</span> { <span class='ident'>source</span>: <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>clone</span>() }
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span><span class='op'>&gt;</span> <span class='ident'>Sink</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='doccomment'>/// Create a new sink.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-&gt;</span> <span class='ident'>Sink</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='ident'>Sink</span> { <span class='ident'>source</span>: <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Source</span>::<span class='ident'>new</span>())) }
+    }
+
+    <span class='doccomment'>/// Generate a stream that fires all events sent into the sink.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>stream</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='ident'>Stream</span> { <span class='ident'>source</span>: <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>clone</span>(), <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(()), }
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span> <span class='ident'>Sink</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='doccomment'>/// Asynchronous send.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// Same as `send`, but it spawns a new thread to process the updates to</span>
+    <span class='doccomment'>/// dependent streams and signals.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>send_async</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>a</span>: <span class='ident'>A</span>) {
+        <span class='kw'>let</span> <span class='ident'>clone</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>clone</span>();
+        <span class='ident'>thread</span>::<span class='ident'>spawn</span>(<span class='kw'>move</span> <span class='op'>||</span> <span class='ident'>clone</span>.<span class='ident'>send</span>(<span class='ident'>a</span>));
+    }
+
+    <span class='doccomment'>/// Feed values from an iterator into the sink.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// This method feeds events into the sink from an iterator.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>feed</span><span class='op'>&lt;</span><span class='ident'>I</span>: <span class='ident'>IntoIterator</span><span class='op'>&lt;</span><span class='ident'>Item</span><span class='op'>=</span><span class='ident'>A</span><span class='op'>&gt;&gt;</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>iterator</span>: <span class='ident'>I</span>) {
+        <span class='kw'>for</span> <span class='ident'>event</span> <span class='kw'>in</span> <span class='ident'>iterator</span> {
+            <span class='self'>self</span>.<span class='ident'>send</span>(<span class='ident'>event</span>);
+        }
+    }
+
+    <span class='doccomment'>/// Asynchronous feed.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// This is the same as `feed`, but it does not block, since it spawns the</span>
+    <span class='doccomment'>/// feeding as a new task. This is useful, if the provided iterator is large</span>
+    <span class='doccomment'>/// or even infinite (e.g. an I/O event loop).</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>feed_async</span><span class='op'>&lt;</span><span class='ident'>I</span>: <span class='ident'>IntoIterator</span><span class='op'>&lt;</span><span class='ident'>Item</span><span class='op'>=</span><span class='ident'>A</span><span class='op'>&gt;</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>iterator</span>: <span class='ident'>I</span>) {
+        <span class='kw'>let</span> <span class='ident'>clone</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>clone</span>();
+        <span class='ident'>thread</span>::<span class='ident'>spawn</span>(<span class='kw'>move</span> <span class='op'>||</span> <span class='ident'>clone</span>.<span class='ident'>feed</span>(<span class='ident'>iterator</span>));
+    }
+
+    <span class='doccomment'>/// Send a value into the sink.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// When a value is sent into the sink, an event is fired in all dependent</span>
+    <span class='doccomment'>/// streams.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>send</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>a</span>: <span class='ident'>A</span>) {
+        <span class='ident'>commit</span>(<span class='op'>||</span> <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>().<span class='ident'>send</span>(<span class='ident'>a</span>))
+    }
+}
+
+
+<span class='doccomment'>/// Trait to wrap cloning of boxed values in a object-safe manner</span>
+<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>BoxClone</span>: <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Send</span> {
+    <span class='doccomment'>/// Clone the object as a boxed trait object</span>
+    <span class='kw'>fn</span> <span class='ident'>box_clone</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>BoxClone</span><span class='op'>&gt;</span>; 
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>T</span>: <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span> <span class='ident'>BoxClone</span> <span class='kw'>for</span> <span class='ident'>T</span> {
+    <span class='kw'>fn</span> <span class='ident'>box_clone</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>BoxClone</span><span class='op'>&gt;</span> {
+        <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='self'>self</span>.<span class='ident'>clone</span>())
+    }
+}
+
+
+<span class='doccomment'>/// Access a stream&#39;s source.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// This is not defined as a method, so that it can be public to other modules</span>
+<span class='doccomment'>/// in this crate while being private outside the crate.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>source</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>(<span class='ident'>stream</span>: <span class='kw-2'>&amp;</span><span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='kw-2'>&amp;</span><span class='ident'>Arc</span><span class='op'>&lt;</span><span class='ident'>RwLock</span><span class='op'>&lt;</span><span class='ident'>Source</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;&gt;</span><span class='op'>&gt;</span> {
+    <span class='kw-2'>&amp;</span><span class='ident'>stream</span>.<span class='ident'>source</span>
+}
+
+
+<span class='doccomment'>/// A stream of events.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Conceptually a stream can be thought of as a series of discrete events that</span>
+<span class='doccomment'>/// occur at specific times. They are ordered by a transaction system. This</span>
+<span class='doccomment'>/// means that firings of disjoint events can not interfere with each other. The</span>
+<span class='doccomment'>/// consequences of one event are atomically reflected in dependent quantities.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Streams provide a number of primitive operations. These can be used to</span>
+<span class='doccomment'>/// compose streams and combine them with signals. For instance, streams can be</span>
+<span class='doccomment'>/// mapped over with a function, merged with another stream of the same type or</span>
+<span class='doccomment'>/// filtered by some predicate.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// # Algebraic laws</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Furthermore, streams satisfy certain algebraic properties that are useful to</span>
+<span class='doccomment'>/// reason about them.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// ## Monoid</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// For once, streams of the same type form a **monoid** under merging. The</span>
+<span class='doccomment'>/// neutral element in this context is `Stream::never()`. So the following laws</span>
+<span class='doccomment'>/// always hold for streams `a`, `b` and `c` of the same type:</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// - Left identity: `Stream::never().merge(&amp;a) == a`,</span>
+<span class='doccomment'>/// - Right identity: `a.merge(&amp;Stream::never()) == a`,</span>
+<span class='doccomment'>/// - Associativity: `a.merge(&amp;b).merge(&amp;c) == a.merge(&amp;b.merge(&amp;c))`.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// *Note that equality in this context is not actually implemented as such,</span>
+<span class='doccomment'>/// since comparing two (potentially infinite) streams is a prohibitive</span>
+<span class='doccomment'>/// operation. Instead, the expressions above can be used interchangably and</span>
+<span class='doccomment'>/// behave identically.*</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// ## Functor</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Under the mapping operation streams also become a functor. A functor is a</span>
+<span class='doccomment'>/// generic type like `Stream` with some mapping operation that takes a function</span>
+<span class='doccomment'>/// `Fn(A) -&gt; B` to map a `Stream&lt;A&gt;` to a `Stream&lt;B&gt;`. Algebraically it</span>
+<span class='doccomment'>/// satisfies the following laws:</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// - The identity function is preserved: `a.map(|x| x) == a`,</span>
+<span class='doccomment'>/// - Function composition is respected: `a.map(f).map(g) == a.map(|x| g(f(x)))`.</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='ident'>source</span>: <span class='ident'>Arc</span><span class='op'>&lt;</span><span class='ident'>RwLock</span><span class='op'>&lt;</span><span class='ident'>Source</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;&gt;</span><span class='op'>&gt;</span>,
+    <span class='attribute'>#[<span class='ident'>allow</span>(<span class='ident'>dead_code</span>)]</span>
+    <span class='ident'>keep_alive</span>: <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>BoxClone</span><span class='op'>&gt;</span>,
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> <span class='ident'>Clone</span> <span class='kw'>for</span> <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='kw'>fn</span> <span class='ident'>clone</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='ident'>Stream</span> {
+            <span class='ident'>source</span>: <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>clone</span>(),
+            <span class='ident'>keep_alive</span>: <span class='self'>self</span>.<span class='ident'>keep_alive</span>.<span class='ident'>box_clone</span>(),
+        }
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span> <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='doccomment'>/// Create a stream that never fires. This can be useful in certain</span>
+    <span class='doccomment'>/// situations, where a stream is logically required, but no events are</span>
+    <span class='doccomment'>/// expected.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>never</span>() <span class='op'>-&gt;</span> <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='ident'>Stream</span> {
+            <span class='ident'>source</span>: <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Source</span>::<span class='ident'>new</span>())),
+            <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(()) 
+        }
+    }
+
+    <span class='doccomment'>/// Map the stream to another stream using a function.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// `map` applies a function to every event fired in this stream to create a</span>
+    <span class='doccomment'>/// new stream of type `B`.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='doccomment'>/// # use carboxyl::Sink;</span>
+    <span class='doccomment'>/// let sink: Sink&lt;i32&gt; = Sink::new();</span>
+    <span class='doccomment'>/// let mut events = sink.stream().map(|x| x + 4).events();</span>
+    <span class='doccomment'>/// sink.send(3);</span>
+    <span class='doccomment'>/// assert_eq!(events.next(), Some(7));</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>map</span><span class='op'>&lt;</span><span class='ident'>B</span>, <span class='ident'>F</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span>
+        <span class='kw'>where</span> <span class='ident'>B</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+              <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='ident'>A</span>) <span class='op'>-&gt;</span> <span class='ident'>B</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+    {
+        <span class='ident'>commit</span>(<span class='op'>||</span> {
+            <span class='kw'>let</span> <span class='ident'>src</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Source</span>::<span class='ident'>new</span>()));
+            <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>src</span>.<span class='ident'>downgrade</span>();
+            <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>()
+                .<span class='ident'>register</span>(<span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> <span class='ident'>with_weak</span>(<span class='kw-2'>&amp;</span><span class='ident'>weak</span>, <span class='op'>|</span><span class='ident'>src</span><span class='op'>|</span> <span class='ident'>src</span>.<span class='ident'>send</span>(<span class='ident'>f</span>(<span class='ident'>a</span>))));
+            <span class='ident'>Stream</span> {
+                <span class='ident'>source</span>: <span class='ident'>src</span>,
+                <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='self'>self</span>.<span class='ident'>clone</span>()),
+            }
+        })
+    }
+
+    <span class='doccomment'>/// Filter a stream according to a predicate.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// `filter` creates a new stream that only fires those events from the</span>
+    <span class='doccomment'>/// original stream that satisfy the predicate.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='doccomment'>/// # use carboxyl::Sink;</span>
+    <span class='doccomment'>/// let sink: Sink&lt;i32&gt; = Sink::new();</span>
+    <span class='doccomment'>/// let mut events = sink.stream()</span>
+    <span class='doccomment'>///     .filter(|&amp;x| (x &gt;= 4) &amp;&amp; (x &lt;= 10))</span>
+    <span class='doccomment'>///     .events();</span>
+    <span class='doccomment'>/// sink.send(2); // won&#39;t arrive</span>
+    <span class='doccomment'>/// sink.send(5); // will arrive</span>
+    <span class='doccomment'>/// assert_eq!(events.next(), Some(5));</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>filter</span><span class='op'>&lt;</span><span class='ident'>F</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>
+        <span class='kw'>where</span> <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='kw-2'>&amp;</span><span class='ident'>A</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+    {
+        <span class='self'>self</span>.<span class='ident'>filter_map</span>(<span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> <span class='kw'>if</span> <span class='ident'>f</span>(<span class='kw-2'>&amp;</span><span class='ident'>a</span>) { <span class='prelude-val'>Some</span>(<span class='ident'>a</span>) } <span class='kw'>else</span> { <span class='prelude-val'>None</span> })
+    }
+
+    <span class='doccomment'>/// Both filter and map a stream.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// This is equivalent to `.map(f).filter_some()`.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='doccomment'>/// # use carboxyl::Sink;</span>
+    <span class='doccomment'>/// let sink = Sink::new();</span>
+    <span class='doccomment'>/// let mut events = sink.stream()</span>
+    <span class='doccomment'>///     .filter_map(|i| if i &gt; 3 { Some(i + 2) } else { None })</span>
+    <span class='doccomment'>///     .events();</span>
+    <span class='doccomment'>/// sink.send(2);</span>
+    <span class='doccomment'>/// sink.send(4);</span>
+    <span class='doccomment'>/// assert_eq!(events.next(), Some(6));</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>filter_map</span><span class='op'>&lt;</span><span class='ident'>B</span>, <span class='ident'>F</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span>
+        <span class='kw'>where</span> <span class='ident'>B</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+              <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='ident'>A</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+    {
+        <span class='self'>self</span>.<span class='ident'>map</span>(<span class='ident'>f</span>).<span class='ident'>filter_some</span>()
+    }
+
+    <span class='doccomment'>/// Merge with another stream.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// `merge` takes two streams and creates a new stream that fires events</span>
+    <span class='doccomment'>/// from both input streams.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='doccomment'>/// # use carboxyl::Sink;</span>
+    <span class='doccomment'>/// let sink_1 = Sink::&lt;i32&gt;::new();</span>
+    <span class='doccomment'>/// let sink_2 = Sink::&lt;i32&gt;::new();</span>
+    <span class='doccomment'>/// let mut events = sink_1.stream().merge(&amp;sink_2.stream()).events();</span>
+    <span class='doccomment'>/// sink_1.send(2);</span>
+    <span class='doccomment'>/// assert_eq!(events.next(), Some(2));</span>
+    <span class='doccomment'>/// sink_2.send(4);</span>
+    <span class='doccomment'>/// assert_eq!(events.next(), Some(4));</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>merge</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&amp;</span><span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='ident'>commit</span>(<span class='op'>||</span> {
+            <span class='kw'>let</span> <span class='ident'>src</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Source</span>::<span class='ident'>new</span>()));
+            <span class='kw'>for</span> <span class='ident'>parent</span> <span class='kw'>in</span> [<span class='self'>self</span>, <span class='ident'>other</span>].<span class='ident'>iter</span>() {
+                <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>src</span>.<span class='ident'>downgrade</span>();
+                <span class='ident'>parent</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>()
+                    .<span class='ident'>register</span>(<span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> <span class='ident'>with_weak</span>(<span class='kw-2'>&amp;</span><span class='ident'>weak</span>, <span class='op'>|</span><span class='ident'>src</span><span class='op'>|</span> <span class='ident'>src</span>.<span class='ident'>send</span>(<span class='ident'>a</span>)));
+            }
+            <span class='ident'>Stream</span> {
+                <span class='ident'>source</span>: <span class='ident'>src</span>,
+                <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>((<span class='self'>self</span>.<span class='ident'>clone</span>(), <span class='ident'>other</span>.<span class='ident'>clone</span>())),
+            }
+        })
+    }
+
+    <span class='doccomment'>/// Coalesce multiple event firings within the same transaction into a</span>
+    <span class='doccomment'>/// single event.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// The function should ideally commute, as the order of events within a</span>
+    <span class='doccomment'>/// transaction is not well-defined.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>coalesce</span><span class='op'>&lt;</span><span class='ident'>F</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>
+        <span class='kw'>where</span> <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='ident'>A</span>, <span class='ident'>A</span>) <span class='op'>-&gt;</span> <span class='ident'>A</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+    {
+        <span class='ident'>commit</span>(<span class='op'>||</span> {
+            <span class='kw'>let</span> <span class='ident'>src</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Source</span>::<span class='ident'>new</span>()));
+            <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>src</span>.<span class='ident'>downgrade</span>();
+            <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>().<span class='ident'>register</span>({
+                <span class='kw'>let</span> <span class='ident'>mutex</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>Mutex</span>::<span class='ident'>new</span>(<span class='prelude-val'>None</span>));
+                <span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> {
+                    <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>inner</span> <span class='op'>=</span> <span class='ident'>mutex</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>();
+                    <span class='op'>*</span><span class='ident'>inner</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='kw'>match</span> <span class='ident'>inner</span>.<span class='ident'>take</span>() {
+                        <span class='prelude-val'>Some</span>(<span class='ident'>b</span>) <span class='op'>=&gt;</span> <span class='ident'>f</span>(<span class='ident'>a</span>, <span class='ident'>b</span>),
+                        <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='ident'>a</span>,
+                    });
+                    <span class='comment'>// Send the updated value later</span>
+                    <span class='ident'>later</span>({
+                        <span class='kw'>let</span> <span class='ident'>mutex</span> <span class='op'>=</span> <span class='ident'>mutex</span>.<span class='ident'>clone</span>();
+                        <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>weak</span>.<span class='ident'>clone</span>();
+                        <span class='kw'>move</span> <span class='op'>||</span> {
+                            <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>inner</span> <span class='op'>=</span> <span class='ident'>mutex</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>();
+                            <span class='comment'>// Take it out and map, so that it does not happen twice</span>
+                            <span class='ident'>inner</span>.<span class='ident'>take</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>value</span><span class='op'>|</span>
+                                <span class='ident'>with_weak</span>(<span class='kw-2'>&amp;</span><span class='ident'>weak</span>, <span class='op'>|</span><span class='ident'>src</span><span class='op'>|</span> <span class='ident'>src</span>.<span class='ident'>send</span>(<span class='ident'>value</span>))
+                            );
+                        }
+                    });
+                    <span class='prelude-val'>Ok</span>(())
+                }
+            });
+            <span class='ident'>Stream</span> { <span class='ident'>source</span>: <span class='ident'>src</span>, <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='self'>self</span>.<span class='ident'>clone</span>()) }
+        })
+    }
+
+    <span class='doccomment'>/// Hold an event in a signal.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// The resulting signal `hold`s the value of the last event fired by the</span>
+    <span class='doccomment'>/// stream.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='doccomment'>/// # use carboxyl::Sink;</span>
+    <span class='doccomment'>/// let sink = Sink::new();</span>
+    <span class='doccomment'>/// let signal = sink.stream().hold(0);</span>
+    <span class='doccomment'>/// assert_eq!(signal.sample(), 0);</span>
+    <span class='doccomment'>/// sink.send(2);</span>
+    <span class='doccomment'>/// assert_eq!(signal.sample(), 2);</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>hold</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>initial</span>: <span class='ident'>A</span>) <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='ident'>signal</span>::<span class='ident'>hold</span>(<span class='ident'>initial</span>, <span class='self'>self</span>)
+    }
+
+    <span class='doccomment'>/// A blocking iterator over the stream.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>events</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Events</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> { <span class='ident'>Events</span>::<span class='ident'>new</span>(<span class='self'>self</span>) }
+
+    <span class='doccomment'>/// Scan a stream and accumulate its event firings in a signal.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// Starting at some initial value, each new event changes the value of the</span>
+    <span class='doccomment'>/// resulting signal as prescribed by the supplied function.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='doccomment'>/// # use carboxyl::Sink;</span>
+    <span class='doccomment'>/// let sink = Sink::new();</span>
+    <span class='doccomment'>/// let sum = sink.stream().scan(0, |a, b| a + b);</span>
+    <span class='doccomment'>/// assert_eq!(sum.sample(), 0);</span>
+    <span class='doccomment'>/// sink.send(2);</span>
+    <span class='doccomment'>/// assert_eq!(sum.sample(), 2);</span>
+    <span class='doccomment'>/// sink.send(4);</span>
+    <span class='doccomment'>/// assert_eq!(sum.sample(), 6);</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>scan</span><span class='op'>&lt;</span><span class='ident'>B</span>, <span class='ident'>F</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>initial</span>: <span class='ident'>B</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span>
+        <span class='kw'>where</span> <span class='ident'>B</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+              <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='ident'>B</span>, <span class='ident'>A</span>) <span class='op'>-&gt;</span> <span class='ident'>B</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+    {
+        <span class='ident'>Signal</span>::<span class='ident'>cyclic</span>(<span class='op'>|</span><span class='ident'>scan</span><span class='op'>|</span> <span class='ident'>scan</span>.<span class='ident'>snapshot</span>(<span class='self'>self</span>, <span class='ident'>f</span>).<span class='ident'>hold</span>(<span class='ident'>initial</span>))
+    }
+
+    <span class='doccomment'>/// Scan a stream and accumulate its event firings in some mutable state.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// Semantically this is equivalent to `scan`. However, it allows one to use</span>
+    <span class='doccomment'>/// a non-Clone type as an accumulator and update it with efficient in-place</span>
+    <span class='doccomment'>/// operations.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// The resulting `SignalMut` does have a slightly different API from a</span>
+    <span class='doccomment'>/// regular `Signal` as it does not allow clones.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// # Example</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='doccomment'>/// # use carboxyl::{ Sink, Signal };</span>
+    <span class='doccomment'>/// let sink: Sink&lt;i32&gt; = Sink::new();</span>
+    <span class='doccomment'>/// let sum = sink.stream()</span>
+    <span class='doccomment'>///     .scan_mut(0, |sum, a| *sum += a)</span>
+    <span class='doccomment'>///     .combine(&amp;Signal::new(()), |sum, ()| *sum);</span>
+    <span class='doccomment'>/// assert_eq!(sum.sample(), 0);</span>
+    <span class='doccomment'>/// sink.send(2);</span>
+    <span class='doccomment'>/// assert_eq!(sum.sample(), 2);</span>
+    <span class='doccomment'>/// sink.send(4);</span>
+    <span class='doccomment'>/// assert_eq!(sum.sample(), 6);</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>scan_mut</span><span class='op'>&lt;</span><span class='ident'>B</span>, <span class='ident'>F</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>initial</span>: <span class='ident'>B</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>SignalMut</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span>
+        <span class='kw'>where</span> <span class='ident'>B</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+              <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>B</span>, <span class='ident'>A</span>) <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+    {
+        <span class='ident'>signal</span>::<span class='ident'>scan_mut</span>(<span class='self'>self</span>, <span class='ident'>initial</span>, <span class='ident'>f</span>)
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span> <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;&gt;</span> {
+    <span class='doccomment'>/// Filter a stream of options.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// `filter_some` creates a new stream that only fires the unwrapped</span>
+    <span class='doccomment'>/// `Some(…)` events from the original stream omitting any `None` events.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='doccomment'>/// # use carboxyl::Sink;</span>
+    <span class='doccomment'>/// let sink = Sink::new();</span>
+    <span class='doccomment'>/// let mut events = sink.stream().filter_some().events();</span>
+    <span class='doccomment'>/// sink.send(None); // won&#39;t arrive</span>
+    <span class='doccomment'>/// sink.send(Some(5)); // will arrive</span>
+    <span class='doccomment'>/// assert_eq!(events.next(), Some(5));</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>filter_some</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='ident'>commit</span>(<span class='op'>||</span> {
+            <span class='kw'>let</span> <span class='ident'>src</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Source</span>::<span class='ident'>new</span>()));
+            <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>src</span>.<span class='ident'>downgrade</span>();
+            <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>()
+                .<span class='ident'>register</span>(<span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> <span class='ident'>a</span>.<span class='ident'>map_or</span>(
+                    <span class='prelude-val'>Ok</span>(()),
+                    <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> <span class='ident'>with_weak</span>(<span class='kw-2'>&amp;</span><span class='ident'>weak</span>, <span class='op'>|</span><span class='ident'>src</span><span class='op'>|</span> <span class='ident'>src</span>.<span class='ident'>send</span>(<span class='ident'>a</span>))
+                ));
+            <span class='ident'>Stream</span> {
+                <span class='ident'>source</span>: <span class='ident'>src</span>,
+                <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='self'>self</span>.<span class='ident'>clone</span>())
+            }
+        })
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span> <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;&gt;</span> {
+    <span class='doccomment'>/// Switch between streams.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// This takes a stream of streams and maps it to a new stream, which fires</span>
+    <span class='doccomment'>/// all events from the most recent stream fired into it.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// # Example</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='doccomment'>/// # use carboxyl::{ Sink, Stream };</span>
+    <span class='doccomment'>/// // Create sinks</span>
+    <span class='doccomment'>/// let stream_sink: Sink&lt;Stream&lt;i32&gt;&gt; = Sink::new();</span>
+    <span class='doccomment'>/// let sink1: Sink&lt;i32&gt; = Sink::new();</span>
+    <span class='doccomment'>/// let sink2: Sink&lt;i32&gt; = Sink::new();</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// // Switch and listen</span>
+    <span class='doccomment'>/// let switched = stream_sink.stream().switch();</span>
+    <span class='doccomment'>/// let mut events = switched.events();</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// // Should not receive events from either sink</span>
+    <span class='doccomment'>/// sink1.send(1); sink2.send(2);</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// // Now switch to sink 2</span>
+    <span class='doccomment'>/// stream_sink.send(sink2.stream());</span>
+    <span class='doccomment'>/// sink1.send(3); sink2.send(4);</span>
+    <span class='doccomment'>/// assert_eq!(events.next(), Some(4));</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// // And then to sink 1</span>
+    <span class='doccomment'>/// stream_sink.send(sink1.stream());</span>
+    <span class='doccomment'>/// sink1.send(5); sink2.send(6);</span>
+    <span class='doccomment'>/// assert_eq!(events.next(), Some(5));</span>
+    <span class='doccomment'>/// ```</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>switch</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='kw'>fn</span> <span class='ident'>rewire_callbacks</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>(<span class='ident'>new_stream</span>: <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>, <span class='ident'>source</span>: <span class='ident'>Weak</span><span class='op'>&lt;</span><span class='ident'>RwLock</span><span class='op'>&lt;</span><span class='ident'>Source</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;&gt;</span><span class='op'>&gt;</span>,
+                               <span class='ident'>terminate</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Arc</span><span class='op'>&lt;</span>()<span class='op'>&gt;</span>)
+            <span class='op'>-&gt;</span> <span class='ident'>CallbackResult</span>
+            <span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='ident'>Clone</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+        {
+            <span class='op'>*</span><span class='ident'>terminate</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(());
+            <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>terminate</span>.<span class='ident'>downgrade</span>();
+            <span class='ident'>new_stream</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>().<span class='ident'>register</span>(<span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span>
+                <span class='ident'>weak</span>.<span class='ident'>upgrade</span>()
+                    .<span class='ident'>ok_or</span>(<span class='ident'>CallbackError</span>::<span class='ident'>Disappeared</span>)
+                    .<span class='ident'>and_then</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>with_weak</span>(<span class='kw-2'>&amp;</span><span class='ident'>source</span>, <span class='op'>|</span><span class='ident'>src</span><span class='op'>|</span> <span class='ident'>src</span>.<span class='ident'>send</span>(<span class='ident'>a</span>)))
+            );
+            <span class='prelude-val'>Ok</span>(())
+        }
+        <span class='ident'>commit</span>(<span class='op'>||</span> {
+            <span class='kw'>let</span> <span class='ident'>src</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Source</span>::<span class='ident'>new</span>()));
+            <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>src</span>.<span class='ident'>downgrade</span>();
+            <span class='self'>self</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>().<span class='ident'>register</span>({
+                <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>terminate</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(());
+                <span class='kw'>move</span> <span class='op'>|</span><span class='ident'>stream</span><span class='op'>|</span> <span class='ident'>rewire_callbacks</span>(<span class='ident'>stream</span>, <span class='ident'>weak</span>.<span class='ident'>clone</span>(), <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>terminate</span>)
+            });
+            <span class='ident'>Stream</span> {
+                <span class='ident'>source</span>: <span class='ident'>src</span>,
+                <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='self'>self</span>.<span class='ident'>clone</span>()),
+            }
+        })
+    }
+}
+
+
+<span class='doccomment'>/// Make a snapshot of a signal, whenever a stream fires an event.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>snapshot</span><span class='op'>&lt;</span><span class='ident'>A</span>, <span class='ident'>B</span>, <span class='ident'>C</span>, <span class='ident'>F</span><span class='op'>&gt;</span>(<span class='ident'>signal</span>: <span class='kw-2'>&amp;</span><span class='ident'>Signal</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>, <span class='ident'>stream</span>: <span class='kw-2'>&amp;</span><span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>B</span><span class='op'>&gt;</span>, <span class='ident'>f</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>C</span><span class='op'>&gt;</span>
+    <span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+          <span class='ident'>B</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+          <span class='ident'>C</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+          <span class='ident'>F</span>: <span class='ident'>Fn</span>(<span class='ident'>A</span>, <span class='ident'>B</span>) <span class='op'>-&gt;</span> <span class='ident'>C</span> <span class='op'>+</span> <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span>,
+{
+    <span class='ident'>commit</span>(<span class='op'>||</span> {
+        <span class='kw'>let</span> <span class='ident'>src</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>RwLock</span>::<span class='ident'>new</span>(<span class='ident'>Source</span>::<span class='ident'>new</span>()));
+        <span class='kw'>let</span> <span class='ident'>weak</span> <span class='op'>=</span> <span class='ident'>src</span>.<span class='ident'>downgrade</span>();
+        <span class='ident'>stream</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>().<span class='ident'>register</span>({
+            <span class='kw'>let</span> <span class='ident'>signal</span> <span class='op'>=</span> <span class='ident'>signal</span>.<span class='ident'>clone</span>();
+            <span class='kw'>move</span> <span class='op'>|</span><span class='ident'>b</span><span class='op'>|</span> <span class='ident'>with_weak</span>(<span class='kw-2'>&amp;</span><span class='ident'>weak</span>, <span class='op'>|</span><span class='ident'>src</span><span class='op'>|</span> <span class='ident'>src</span>.<span class='ident'>send</span>(<span class='ident'>f</span>(<span class='ident'>sample_raw</span>(<span class='kw-2'>&amp;</span><span class='ident'>signal</span>), <span class='ident'>b</span>)))
+        });
+        <span class='ident'>Stream</span> {
+            <span class='ident'>source</span>: <span class='ident'>src</span>,
+            <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>((<span class='ident'>stream</span>.<span class='ident'>clone</span>(), <span class='ident'>signal</span>.<span class='ident'>clone</span>())),
+        }
+    })
+}
+
+
+<span class='doccomment'>/// A blocking iterator over events in a stream.</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Events</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='ident'>receiver</span>: <span class='ident'>Receiver</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>,
+    <span class='attribute'>#[<span class='ident'>allow</span>(<span class='ident'>dead_code</span>)]</span>
+    <span class='ident'>keep_alive</span>: <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>BoxClone</span><span class='op'>&gt;</span>,
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span> <span class='ident'>Events</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='doccomment'>/// Create a new events iterator.</span>
+    <span class='kw'>fn</span> <span class='ident'>new</span>(<span class='ident'>stream</span>: <span class='kw-2'>&amp;</span><span class='ident'>Stream</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='ident'>Events</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+        <span class='ident'>commit</span>(<span class='op'>||</span> {
+            <span class='kw'>let</span> (<span class='ident'>tx</span>, <span class='ident'>rx</span>) <span class='op'>=</span> <span class='ident'>channel</span>();
+            <span class='kw'>let</span> <span class='ident'>tx</span> <span class='op'>=</span> <span class='ident'>Mutex</span>::<span class='ident'>new</span>(<span class='ident'>tx</span>);
+            <span class='ident'>stream</span>.<span class='ident'>source</span>.<span class='ident'>write</span>().<span class='ident'>unwrap</span>().<span class='ident'>register</span>(
+                <span class='kw'>move</span> <span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> <span class='ident'>tx</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>().<span class='ident'>send</span>(<span class='ident'>a</span>).<span class='ident'>map_err</span>(<span class='op'>|</span>_<span class='op'>|</span> <span class='ident'>CallbackError</span>::<span class='ident'>Disappeared</span>)
+            );
+            <span class='ident'>Events</span> {
+                <span class='ident'>receiver</span>: <span class='ident'>rx</span>,
+                <span class='ident'>keep_alive</span>: <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>stream</span>.<span class='ident'>clone</span>()),
+            }
+        })
+    }
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='ident'>A</span>: <span class='ident'>Send</span> <span class='op'>+</span> <span class='ident'>Sync</span> <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>Events</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> {
+    <span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>A</span>;
+    <span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>A</span><span class='op'>&gt;</span> { <span class='self'>self</span>.<span class='ident'>receiver</span>.<span class='ident'>recv</span>().<span class='ident'>ok</span>() }
+}
+
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>mod</span> <span class='ident'>test</span> {
+    <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>thread</span>;
+    <span class='kw'>use</span> <span class='ident'>quickcheck</span>::<span class='ident'>quickcheck</span>;
+
+    <span class='kw'>use</span> <span class='ident'>testing</span>::{ <span class='ident'>id</span>, <span class='ident'>stream_eq</span> };
+    <span class='kw'>use</span> <span class='ident'>super</span>::<span class='op'>*</span>;
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>sink</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>events</span>();
+        <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>1</span>);
+        <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>2</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>1</span>));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>2</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>map</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>triple</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='number'>3</span> <span class='op'>*</span> <span class='ident'>x</span>);
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>triple</span>.<span class='ident'>events</span>();
+        <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>1</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>3</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>filter_some</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>small</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>filter_some</span>();
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>small</span>.<span class='ident'>events</span>();
+        <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='prelude-val'>None</span>);
+        <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='prelude-val'>Some</span>(<span class='number'>9</span>));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>9</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>chain_1</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span>: <span class='ident'>Sink</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>chain</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>()
+            .<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span> <span class='op'>/</span> <span class='number'>2</span>)
+            .<span class='ident'>filter</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span> <span class='op'>&lt;</span> <span class='number'>3</span>);
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>chain</span>.<span class='ident'>events</span>();
+        <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>7</span>);
+        <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>4</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>2</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>merge</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink1</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>sink2</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>sink1</span>.<span class='ident'>stream</span>().<span class='ident'>merge</span>(<span class='kw-2'>&amp;</span><span class='ident'>sink2</span>.<span class='ident'>stream</span>()).<span class='ident'>events</span>();
+        <span class='ident'>sink1</span>.<span class='ident'>send</span>(<span class='number'>12</span>);
+        <span class='ident'>sink2</span>.<span class='ident'>send</span>(<span class='number'>9</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>12</span>));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>9</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>chain_2</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink1</span>: <span class='ident'>Sink</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>sink2</span>: <span class='ident'>Sink</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>sink1</span>.<span class='ident'>stream</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span> <span class='op'>+</span> <span class='number'>4</span>)
+            .<span class='ident'>merge</span>(
+                <span class='kw-2'>&amp;</span><span class='ident'>sink2</span>.<span class='ident'>stream</span>()
+                .<span class='ident'>filter_map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='kw'>if</span> <span class='ident'>x</span> <span class='op'>&lt;</span> <span class='number'>4</span> { <span class='prelude-val'>Some</span>(<span class='ident'>x</span>) } <span class='kw'>else</span> { <span class='prelude-val'>None</span> })
+                .<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span> <span class='op'>*</span> <span class='number'>5</span>))
+            .<span class='ident'>events</span>();
+        <span class='ident'>sink1</span>.<span class='ident'>send</span>(<span class='number'>12</span>);
+        <span class='ident'>sink2</span>.<span class='ident'>send</span>(<span class='number'>3</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>16</span>));
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>15</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>move_closure</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>x</span> <span class='op'>=</span> <span class='number'>3</span>;
+        <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>map</span>(<span class='kw'>move</span> <span class='op'>|</span><span class='ident'>y</span><span class='op'>|</span> <span class='ident'>y</span> <span class='op'>+</span> <span class='ident'>x</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>scan_race_condition</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='comment'>// Feed the sink in the background</span>
+        <span class='ident'>sink</span>.<span class='ident'>feed_async</span>(<span class='number'>0</span>..<span class='number'>100000</span>);
+        <span class='comment'>// Try it multiple times to increase failure probability, when a data</span>
+        <span class='comment'>// race can potentially happen.</span>
+        <span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>10</span> {
+            <span class='kw'>let</span> <span class='ident'>_sum</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>scan</span>(<span class='number'>0</span>, <span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> <span class='ident'>a</span> <span class='op'>+</span> <span class='ident'>b</span>);
+        }
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>sink_send_async</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>events</span>();
+        <span class='ident'>sink</span>.<span class='ident'>send_async</span>(<span class='number'>1</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>1</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>sink_feed</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>events</span>();
+        <span class='ident'>sink</span>.<span class='ident'>feed</span>(<span class='number'>0</span>..<span class='number'>10</span>);
+        <span class='kw'>for</span> (<span class='ident'>n</span>, <span class='ident'>m</span>) <span class='kw'>in</span> <span class='ident'>events</span>.<span class='ident'>take</span>(<span class='number'>10</span>).<span class='ident'>enumerate</span>() {
+            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>n</span> <span class='kw'>as</span> <span class='ident'>i32</span>, <span class='ident'>m</span>);
+        }
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>sink_feed_async</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>().<span class='ident'>events</span>();
+        <span class='ident'>sink</span>.<span class='ident'>feed_async</span>(<span class='number'>0</span>..<span class='number'>10</span>);
+        <span class='kw'>for</span> (<span class='ident'>n</span>, <span class='ident'>m</span>) <span class='kw'>in</span> <span class='ident'>events</span>.<span class='ident'>take</span>(<span class='number'>10</span>).<span class='ident'>enumerate</span>() {
+            <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>n</span> <span class='kw'>as</span> <span class='ident'>i32</span>, <span class='ident'>m</span>);
+        }
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>coalesce</span>() {
+        <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+        <span class='kw'>let</span> <span class='ident'>stream</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>()
+            .<span class='ident'>merge</span>(<span class='kw-2'>&amp;</span><span class='ident'>sink</span>.<span class='ident'>stream</span>())
+            .<span class='ident'>coalesce</span>(<span class='op'>|</span><span class='ident'>a</span>, <span class='ident'>b</span><span class='op'>|</span> <span class='ident'>a</span> <span class='op'>+</span> <span class='ident'>b</span>);
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>events</span> <span class='op'>=</span> <span class='ident'>stream</span>.<span class='ident'>events</span>();
+
+        <span class='ident'>sink</span>.<span class='ident'>send</span>(<span class='number'>1</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>events</span>.<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='number'>2</span>));
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>monoid_left_identity</span>() {
+        <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>input</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>&gt;</span> {
+            <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+            <span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>();
+            <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>stream_eq</span>(<span class='kw-2'>&amp;</span><span class='ident'>Stream</span>::<span class='ident'>never</span>().<span class='ident'>merge</span>(<span class='kw-2'>&amp;</span><span class='ident'>a</span>), <span class='kw-2'>&amp;</span><span class='ident'>a</span>);
+            <span class='ident'>sink</span>.<span class='ident'>feed</span>(<span class='ident'>input</span>.<span class='ident'>into_iter</span>());
+            <span class='ident'>eq</span>.<span class='ident'>sample</span>()
+        }
+        <span class='ident'>quickcheck</span>(<span class='ident'>check</span> <span class='kw'>as</span> <span class='kw'>fn</span>(<span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>&gt;</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>monoid_right_identity</span>() {
+        <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>input</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>&gt;</span> {
+            <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+            <span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>();
+            <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>stream_eq</span>(<span class='kw-2'>&amp;</span><span class='ident'>a</span>.<span class='ident'>merge</span>(<span class='kw-2'>&amp;</span><span class='ident'>Stream</span>::<span class='ident'>never</span>()), <span class='kw-2'>&amp;</span><span class='ident'>a</span>);
+            <span class='ident'>sink</span>.<span class='ident'>feed</span>(<span class='ident'>input</span>.<span class='ident'>into_iter</span>());
+            <span class='ident'>eq</span>.<span class='ident'>sample</span>()
+        }
+        <span class='ident'>quickcheck</span>(<span class='ident'>check</span> <span class='kw'>as</span> <span class='kw'>fn</span>(<span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>&gt;</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>monoid_associative</span>() {
+        <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>input_a</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>, <span class='ident'>input_b</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>, <span class='ident'>input_c</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>&gt;</span> {
+            <span class='kw'>let</span> <span class='ident'>sink_a</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+            <span class='kw'>let</span> <span class='ident'>sink_b</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+            <span class='kw'>let</span> <span class='ident'>sink_c</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+            <span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>sink_a</span>.<span class='ident'>stream</span>();
+            <span class='kw'>let</span> <span class='ident'>b</span> <span class='op'>=</span> <span class='ident'>sink_b</span>.<span class='ident'>stream</span>();
+            <span class='kw'>let</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>sink_c</span>.<span class='ident'>stream</span>();
+            <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>stream_eq</span>(<span class='kw-2'>&amp;</span><span class='ident'>a</span>.<span class='ident'>merge</span>(<span class='kw-2'>&amp;</span><span class='ident'>b</span>.<span class='ident'>merge</span>(<span class='kw-2'>&amp;</span><span class='ident'>c</span>)), <span class='kw-2'>&amp;</span><span class='ident'>a</span>.<span class='ident'>merge</span>(<span class='kw-2'>&amp;</span><span class='ident'>b</span>).<span class='ident'>merge</span>(<span class='kw-2'>&amp;</span><span class='ident'>c</span>));
+            <span class='comment'>/* feed in parallel */</span> {
+                <span class='kw'>let</span> <span class='ident'>_g1</span> <span class='op'>=</span> <span class='ident'>thread</span>::<span class='ident'>scoped</span>(<span class='op'>||</span> <span class='ident'>sink_a</span>.<span class='ident'>feed</span>(<span class='ident'>input_a</span>.<span class='ident'>into_iter</span>()));
+                <span class='kw'>let</span> <span class='ident'>_g2</span> <span class='op'>=</span> <span class='ident'>thread</span>::<span class='ident'>scoped</span>(<span class='op'>||</span> <span class='ident'>sink_b</span>.<span class='ident'>feed</span>(<span class='ident'>input_b</span>.<span class='ident'>into_iter</span>()));
+                <span class='kw'>let</span> <span class='ident'>_g3</span> <span class='op'>=</span> <span class='ident'>thread</span>::<span class='ident'>scoped</span>(<span class='op'>||</span> <span class='ident'>sink_c</span>.<span class='ident'>feed</span>(<span class='ident'>input_c</span>.<span class='ident'>into_iter</span>()));
+            }
+            <span class='ident'>eq</span>.<span class='ident'>sample</span>()
+        }
+        <span class='ident'>quickcheck</span>(<span class='ident'>check</span> <span class='kw'>as</span> <span class='kw'>fn</span>(<span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>, <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>, <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>&gt;</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>functor_identity</span>() {
+        <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>input</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>&gt;</span> {
+            <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+            <span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>();
+            <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>stream_eq</span>(<span class='kw-2'>&amp;</span><span class='ident'>a</span>.<span class='ident'>map</span>(<span class='ident'>id</span>), <span class='kw-2'>&amp;</span><span class='ident'>a</span>);
+            <span class='ident'>sink</span>.<span class='ident'>feed</span>(<span class='ident'>input</span>.<span class='ident'>into_iter</span>());
+            <span class='ident'>eq</span>.<span class='ident'>sample</span>()
+        }
+        <span class='ident'>quickcheck</span>(<span class='ident'>check</span> <span class='kw'>as</span> <span class='kw'>fn</span>(<span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>&gt;</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>functor_composition</span>() {
+        <span class='kw'>fn</span> <span class='ident'>check</span>(<span class='ident'>input</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>&gt;</span> {
+            <span class='kw'>fn</span> <span class='ident'>f</span>(<span class='ident'>n</span>: <span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='ident'>i64</span> { (<span class='ident'>n</span> <span class='op'>+</span> <span class='number'>3</span>) <span class='kw'>as</span> <span class='ident'>i64</span> }
+            <span class='kw'>fn</span> <span class='ident'>g</span>(<span class='ident'>n</span>: <span class='ident'>i64</span>) <span class='op'>-&gt;</span> <span class='ident'>f64</span> { <span class='ident'>n</span> <span class='kw'>as</span> <span class='ident'>f64</span> <span class='op'>/</span> <span class='number'>2.5</span> }
+
+            <span class='kw'>let</span> <span class='ident'>sink</span> <span class='op'>=</span> <span class='ident'>Sink</span>::<span class='ident'>new</span>();
+            <span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>sink</span>.<span class='ident'>stream</span>();
+            <span class='kw'>let</span> <span class='ident'>eq</span> <span class='op'>=</span> <span class='ident'>stream_eq</span>(<span class='kw-2'>&amp;</span><span class='ident'>a</span>.<span class='ident'>map</span>(<span class='ident'>f</span>).<span class='ident'>map</span>(<span class='ident'>g</span>), <span class='kw-2'>&amp;</span><span class='ident'>a</span>.<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>n</span><span class='op'>|</span> <span class='ident'>g</span>(<span class='ident'>f</span>(<span class='ident'>n</span>))));
+            <span class='ident'>sink</span>.<span class='ident'>feed</span>(<span class='ident'>input</span>.<span class='ident'>into_iter</span>());
+            <span class='ident'>eq</span>.<span class='ident'>sample</span>()
+        }
+        <span class='ident'>quickcheck</span>(<span class='ident'>check</span> <span class='kw'>as</span> <span class='kw'>fn</span>(<span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>bool</span>, <span class='ident'>String</span><span class='op'>&gt;</span>);
+    }
+}
+</pre>
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diff --git a/src/carboxyl/transaction.rs.html b/src/carboxyl/transaction.rs.html
new file mode 100644
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+    <section id='main' class="content source"><pre class="line-numbers"><span id="1">  1</span>
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+</pre><pre class='rust '>
+<span class='doccomment'>//! A trivial global lock transaction system.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! At the moment, this is really just a global static mutex, that needs to be</span>
+<span class='doccomment'>//! locked, to ensure the atomicity of a transaction.</span>
+
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::<span class='ident'>Mutex</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>cell</span>::<span class='ident'>RefCell</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>boxed</span>::<span class='ident'>FnBox</span>;
+
+
+<span class='doccomment'>/// The global transaction lock.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// TODO: revert this to use a static mutex, as soon as that is stabilized in</span>
+<span class='doccomment'>/// the standard library.</span>
+<span class='macro'>lazy_static</span><span class='macro'>!</span> {
+    <span class='kw'>static</span> <span class='kw-2'>ref</span> <span class='ident'>TRANSACTION_MUTEX</span>: <span class='ident'>Mutex</span><span class='op'>&lt;</span>()<span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Mutex</span>::<span class='ident'>new</span>(());
+}
+
+<span class='doccomment'>/// Registry for callbacks to be executed at the end of a transaction.</span>
+<span class='macro'>thread_local</span><span class='macro'>!</span>(
+    <span class='kw'>static</span> <span class='ident'>CURRENT_TRANSACTION</span>: <span class='ident'>RefCell</span><span class='op'>&lt;</span><span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Transaction</span><span class='op'>&gt;&gt;</span> <span class='op'>=</span>
+        <span class='ident'>RefCell</span>::<span class='ident'>new</span>(<span class='prelude-val'>None</span>)
+);
+
+
+<span class='doccomment'>/// A callback.</span>
+<span class='kw'>type</span> <span class='ident'>Callback</span> <span class='op'>=</span> <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>FnBox</span>() <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span>;
+
+
+<span class='doccomment'>/// A transaction.</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Transaction</span> {
+    <span class='ident'>intermediate</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>Callback</span><span class='op'>&gt;</span>,
+    <span class='ident'>finalizers</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>Callback</span><span class='op'>&gt;</span>,
+}
+
+<span class='kw'>impl</span> <span class='ident'>Transaction</span> {
+    <span class='doccomment'>/// Create a new transaction</span>
+    <span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-&gt;</span> <span class='ident'>Transaction</span> {
+        <span class='ident'>Transaction</span> {
+            <span class='ident'>intermediate</span>: <span class='macro'>vec</span><span class='macro'>!</span>[],
+            <span class='ident'>finalizers</span>: <span class='macro'>vec</span><span class='macro'>!</span>[],
+        }
+    }
+
+    <span class='doccomment'>/// Add a callback that will be called, when the transaction is done</span>
+    <span class='doccomment'>/// except for finalizers.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>later</span><span class='op'>&lt;</span><span class='ident'>F</span>: <span class='ident'>FnOnce</span>() <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>callback</span>: <span class='ident'>F</span>) {
+        <span class='self'>self</span>.<span class='ident'>intermediate</span>.<span class='ident'>push</span>(<span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>callback</span>));
+    }
+
+    <span class='doccomment'>/// Add a finalizing callback. This should not have far reaching</span>
+    <span class='doccomment'>/// side-effects, and in particular not commit by itself. Typical operations</span>
+    <span class='doccomment'>/// for a finalizer are executing queued state updates.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>end</span><span class='op'>&lt;</span><span class='ident'>F</span>: <span class='ident'>FnOnce</span>() <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>callback</span>: <span class='ident'>F</span>) {
+        <span class='self'>self</span>.<span class='ident'>finalizers</span>.<span class='ident'>push</span>(<span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>callback</span>));
+    }
+
+    <span class='doccomment'>/// Advance transactions by moving out intermediate stage callbacks.</span>
+    <span class='kw'>fn</span> <span class='ident'>advance</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>Callback</span><span class='op'>&gt;</span> {
+        <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>mem</span>;
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>intermediate</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[];
+        <span class='ident'>mem</span>::<span class='ident'>swap</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>intermediate</span>, <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>.<span class='ident'>intermediate</span>);
+        <span class='ident'>intermediate</span>
+    }
+
+    <span class='doccomment'>/// Finalize the transaction</span>
+    <span class='kw'>fn</span> <span class='ident'>finalize</span>(<span class='self'>self</span>) {
+        <span class='kw'>for</span> <span class='ident'>finalizer</span> <span class='kw'>in</span> <span class='self'>self</span>.<span class='ident'>finalizers</span> {
+            <span class='ident'>finalizer</span>.<span class='ident'>call_box</span>(());
+        }
+    }
+}
+
+
+<span class='doccomment'>/// Commit a transaction.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// If the thread is not running any transactions currently, the global lock is</span>
+<span class='doccomment'>/// acquired. Otherwise a new transaction begins, since given the interface of</span>
+<span class='doccomment'>/// this module it is safely assumed that the lock is already held.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>commit</span><span class='op'>&lt;</span><span class='ident'>A</span>, <span class='ident'>F</span>: <span class='ident'>FnOnce</span>() <span class='op'>-&gt;</span> <span class='ident'>A</span><span class='op'>&gt;</span>(<span class='ident'>body</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>A</span> {
+    <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>mem</span>;
+    <span class='comment'>// Begin a new transaction</span>
+    <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>prev</span> <span class='op'>=</span> <span class='ident'>CURRENT_TRANSACTION</span>.<span class='ident'>with</span>(<span class='op'>|</span><span class='ident'>current</span><span class='op'>|</span> {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>prev</span> <span class='op'>=</span> <span class='prelude-val'>Some</span>(<span class='ident'>Transaction</span>::<span class='ident'>new</span>());
+        <span class='ident'>mem</span>::<span class='ident'>swap</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>prev</span>, <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>current</span>.<span class='ident'>borrow_mut</span>());
+        <span class='ident'>prev</span>
+    });
+    <span class='comment'>// Acquire global lock if necessary</span>
+    <span class='kw'>let</span> <span class='ident'>_lock</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>prev</span> {
+        <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Some</span>(<span class='ident'>TRANSACTION_MUTEX</span>.<span class='ident'>lock</span>().<span class='ident'>ok</span>()
+                .<span class='ident'>expect</span>(<span class='string'>&quot;global transaction mutex poisoned&quot;</span>)
+        ),
+        <span class='prelude-val'>Some</span>(_) <span class='op'>=&gt;</span> <span class='prelude-val'>None</span>,
+    };
+    <span class='comment'>// Perform the main body of the transaction</span>
+    <span class='kw'>let</span> <span class='ident'>result</span> <span class='op'>=</span> <span class='ident'>body</span>();
+    <span class='comment'>// Advance the transaction as long as necessary</span>
+    <span class='kw'>loop</span> {
+        <span class='kw'>let</span> <span class='ident'>callbacks</span> <span class='op'>=</span> <span class='ident'>with_current</span>(<span class='ident'>Transaction</span>::<span class='ident'>advance</span>);
+        <span class='kw'>if</span> <span class='ident'>callbacks</span>.<span class='ident'>is_empty</span>() { <span class='kw'>break</span> }
+        <span class='kw'>for</span> <span class='ident'>callback</span> <span class='kw'>in</span> <span class='ident'>callbacks</span> {
+            <span class='ident'>callback</span>.<span class='ident'>call_box</span>(());
+        }
+    }
+    <span class='comment'>// Call all finalizers and drop the transaction</span>
+    <span class='ident'>CURRENT_TRANSACTION</span>.<span class='ident'>with</span>(<span class='op'>|</span><span class='ident'>current</span><span class='op'>|</span>
+        <span class='ident'>mem</span>::<span class='ident'>swap</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>prev</span>, <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>current</span>.<span class='ident'>borrow_mut</span>())
+    );
+    <span class='ident'>prev</span>.<span class='ident'>unwrap</span>().<span class='ident'>finalize</span>();
+    <span class='comment'>// Return</span>
+    <span class='ident'>result</span>
+}
+
+
+<span class='doccomment'>/// Register a callback during a transaction.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>with_current</span><span class='op'>&lt;</span><span class='ident'>A</span>, <span class='ident'>F</span>: <span class='ident'>FnOnce</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>Transaction</span>) <span class='op'>-&gt;</span> <span class='ident'>A</span><span class='op'>&gt;</span>(<span class='ident'>action</span>: <span class='ident'>F</span>) <span class='op'>-&gt;</span> <span class='ident'>A</span> {
+    <span class='ident'>CURRENT_TRANSACTION</span>.<span class='ident'>with</span>(<span class='op'>|</span><span class='ident'>current</span><span class='op'>|</span>
+        <span class='kw'>match</span> <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='op'>*</span><span class='ident'>current</span>.<span class='ident'>borrow_mut</span>() {
+            <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='prelude-val'>Some</span>(<span class='kw-2'>ref</span> <span class='kw-2'>mut</span> <span class='ident'>trans</span>) <span class='op'>=&gt;</span> <span class='ident'>action</span>(<span class='ident'>trans</span>),
+            _ <span class='op'>=&gt;</span> <span class='macro'>panic</span><span class='macro'>!</span>(<span class='string'>&quot;there is no active transaction to register a callback&quot;</span>),
+        }
+    )
+}
+
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>later</span><span class='op'>&lt;</span><span class='ident'>F</span>: <span class='ident'>FnOnce</span>() <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span>(<span class='ident'>action</span>: <span class='ident'>F</span>) {
+    <span class='ident'>with_current</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span>.<span class='ident'>later</span>(<span class='ident'>action</span>))
+}
+
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>end</span><span class='op'>&lt;</span><span class='ident'>F</span>: <span class='ident'>FnOnce</span>() <span class='op'>+</span> <span class='lifetime'>&#39;static</span><span class='op'>&gt;</span>(<span class='ident'>action</span>: <span class='ident'>F</span>) {
+    <span class='ident'>with_current</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span>.<span class='ident'>end</span>(<span class='ident'>action</span>))
+}
+
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>mod</span> <span class='ident'>test</span> {
+    <span class='kw'>use</span> <span class='ident'>super</span>::<span class='op'>*</span>;
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>commit_single</span>() {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='number'>3</span>;
+        <span class='ident'>commit</span>(<span class='op'>||</span> <span class='ident'>v</span> <span class='op'>+=</span> <span class='number'>5</span>);
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, <span class='number'>8</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>commit_nested</span>() {
+        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='number'>3</span>;
+        <span class='ident'>commit</span>(<span class='op'>||</span> {
+            <span class='ident'>commit</span>(<span class='op'>||</span> <span class='ident'>v</span> <span class='op'>*=</span> <span class='number'>2</span>);
+            <span class='ident'>v</span> <span class='op'>+=</span> <span class='number'>4</span>;
+        });
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, <span class='number'>10</span>);
+    }
+
+    <span class='attribute'>#[<span class='ident'>test</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>commits_parallel</span>() {
+        <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::{<span class='ident'>Arc</span>, <span class='ident'>Mutex</span>};
+        <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>thread</span>;
+
+        <span class='comment'>// Set up a ref-counted value</span>
+        <span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>Mutex</span>::<span class='ident'>new</span>(<span class='number'>3</span>));
+        <span class='comment'>// Spawn a couple of scoped threads performing atomic operations on it</span>
+        <span class='kw'>let</span> <span class='ident'>guards</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span>_<span class='op'>&gt;</span> <span class='op'>=</span> (<span class='number'>0</span>..<span class='number'>3</span>)
+            .<span class='ident'>map</span>(<span class='op'>|</span>_<span class='op'>|</span> {
+                <span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='ident'>v</span>.<span class='ident'>clone</span>();
+                <span class='ident'>thread</span>::<span class='ident'>spawn</span>(<span class='kw'>move</span> <span class='op'>||</span> <span class='ident'>commit</span>(<span class='kw'>move</span> <span class='op'>||</span> {
+                    <span class='comment'>// Acquire locks independently, s.t. commit atomicity does</span>
+                    <span class='comment'>// not rely on the local locks here</span>
+                    <span class='op'>*</span><span class='ident'>v</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>() <span class='op'>*=</span> <span class='number'>2</span>;
+                    <span class='comment'>// …and sleep for a bit</span>
+                    <span class='ident'>thread</span>::<span class='ident'>sleep_ms</span>(<span class='number'>1</span>);
+                    <span class='op'>*</span><span class='ident'>v</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>() <span class='op'>-=</span> <span class='number'>1</span>;
+                }))
+            })
+            .<span class='ident'>collect</span>();
+        <span class='comment'>// Rejoin with all guards</span>
+        <span class='kw'>for</span> <span class='ident'>guard</span> <span class='kw'>in</span> <span class='ident'>guards</span> { <span class='ident'>guard</span>.<span class='ident'>join</span>().<span class='ident'>ok</span>().<span class='ident'>expect</span>(<span class='string'>&quot;thread failed&quot;</span>); }
+        <span class='comment'>// Check result</span>
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='kw-2'>&amp;</span><span class='op'>*</span><span class='ident'>v</span>.<span class='ident'>lock</span>().<span class='ident'>unwrap</span>(), <span class='kw-2'>&amp;</span><span class='number'>17</span>);
+    }
+}
+</pre>
+</section>
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author		2015-06-29 20:16:15 +0000
committer		2015-06-29 20:16:15 +0000
commit	64106c4d3d4ddba8c7bc2af75376e6d3d3d75601 (patch)
tree	8c64d6e8be006486d975a651505fbbde61365cd6 /src/carboxyl
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