Update documentationgh-pages

author: 2015-06-29 20:16:15 +0000
committer: 2015-06-29 20:16:15 +0000
commit: 64106c4d3d4ddba8c7bc2af75376e6d3d3d75601 (patch)
tree: 8c64d6e8be006486d975a651505fbbde61365cd6 /src/log
download: irsc-gh-pages.tar.gz
irsc-gh-pages.tar.xz
irsc-gh-pages.zip
2 files changed, 2030 insertions, 0 deletions
diff --git a/src/log/lib.rs.html b/src/log/lib.rs.html
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@@ -0,0 +1,1643 @@
+<!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/log-0.3.1/src/lib.rs`.">
+    <meta name="keywords" content="rust, rustlang, rust-lang">
+
+    <title>lib.rs.html -- source</title>
+
+    <link rel="stylesheet" type="text/css" href="../../main.css">
+
+    <link rel="shortcut icon" href="http://www.rust-lang.org/favicon.ico">
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+</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]-->
+
+    
+
+    <section class="sidebar">
+        <a href='../../log/index.html'><img src='http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='' width='100'></a>
+        
+    </section>
+
+    <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">
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+        </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>
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+<span id="772">772</span>
+<span id="773">773</span>
+</pre><pre class='rust '>
+<span class='comment'>// Copyright 2015 The Rust Project Developers. See the COPYRIGHT</span>
+<span class='comment'>// file at the top-level directory of this distribution and at</span>
+<span class='comment'>// http://rust-lang.org/COPYRIGHT.</span>
+<span class='comment'>//</span>
+<span class='comment'>// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
+<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
+<span class='comment'>// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
+<span class='comment'>// option. This file may not be copied, modified, or distributed</span>
+<span class='comment'>// except according to those terms.</span>
+
+<span class='doccomment'>//! A lightweight logging facade.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! A logging facade provides a single logging API that abstracts over the</span>
+<span class='doccomment'>//! actual logging implementation. Libraries can use the logging API provided</span>
+<span class='doccomment'>//! by this crate, and the consumer of those libraries can choose the logging</span>
+<span class='doccomment'>//! framework that is most suitable for its use case.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! If no logging implementation is selected, the facade falls back to a &quot;noop&quot;</span>
+<span class='doccomment'>//! implementation that ignores all log messages. The overhead in this case</span>
+<span class='doccomment'>//! is very small - just an integer load, comparison and jump.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! A log request consists of a target, a level, and a body. A target is a</span>
+<span class='doccomment'>//! string which defaults to the module path of the location of the log</span>
+<span class='doccomment'>//! request, though that default may be overridden. Logger implementations</span>
+<span class='doccomment'>//! typically use the target to filter requests based on some user</span>
+<span class='doccomment'>//! configuration.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! # Use</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! ## In libraries</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! Libraries should link only to the `log` crate, and use the provided</span>
+<span class='doccomment'>//! macros to log whatever information will be useful to downstream consumers.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! ### Examples</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! ```rust</span>
+<span class='doccomment'>//! # #![allow(unstable)]</span>
+<span class='doccomment'>//! #[macro_use]</span>
+<span class='doccomment'>//! extern crate log;</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! # #[derive(Debug)] pub struct Yak(String);</span>
+<span class='doccomment'>//! # impl Yak { fn shave(&amp;self, _: u32) {} }</span>
+<span class='doccomment'>//! # fn find_a_razor() -&gt; Result&lt;u32, u32&gt; { Ok(1) }</span>
+<span class='doccomment'>//! pub fn shave_the_yak(yak: &amp;Yak) {</span>
+<span class='doccomment'>//!     info!(target: &quot;yak_events&quot;, &quot;Commencing yak shaving for {:?}&quot;, yak);</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//!     loop {</span>
+<span class='doccomment'>//!         match find_a_razor() {</span>
+<span class='doccomment'>//!             Ok(razor) =&gt; {</span>
+<span class='doccomment'>//!                 info!(&quot;Razor located: {}&quot;, razor);</span>
+<span class='doccomment'>//!                 yak.shave(razor);</span>
+<span class='doccomment'>//!                 break;</span>
+<span class='doccomment'>//!             }</span>
+<span class='doccomment'>//!             Err(err) =&gt; {</span>
+<span class='doccomment'>//!                 warn!(&quot;Unable to locate a razor: {}, retrying&quot;, err);</span>
+<span class='doccomment'>//!             }</span>
+<span class='doccomment'>//!         }</span>
+<span class='doccomment'>//!     }</span>
+<span class='doccomment'>//! }</span>
+<span class='doccomment'>//! # fn main() {}</span>
+<span class='doccomment'>//! ```</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! ## In executables</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! Executables should chose a logging framework and initialize it early in the</span>
+<span class='doccomment'>//! runtime of the program. Logging frameworks will typically include a</span>
+<span class='doccomment'>//! function to do this. Any log messages generated before the framework is</span>
+<span class='doccomment'>//! initialized will be ignored.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! The executable itself may use the `log` crate to log as well.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! ### Warning</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! The logging system may only be initialized once.</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! ### Examples</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! ```rust,ignore</span>
+<span class='doccomment'>//! #[macro_use]</span>
+<span class='doccomment'>//! extern crate log;</span>
+<span class='doccomment'>//! extern crate my_logger;</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! fn main() {</span>
+<span class='doccomment'>//!     my_logger::init();</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//!     info!(&quot;starting up&quot;);</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//!     // ...</span>
+<span class='doccomment'>//! }</span>
+<span class='doccomment'>//! ```</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! # Logger implementations</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! Loggers implement the `Log` trait. Here&#39;s a very basic example that simply</span>
+<span class='doccomment'>//! logs all messages at the `Error`, `Warn` or `Info` levels to stdout:</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! ```rust</span>
+<span class='doccomment'>//! extern crate log;</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! use log::{LogRecord, LogLevel, LogMetadata};</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! struct SimpleLogger;</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! impl log::Log for SimpleLogger {</span>
+<span class='doccomment'>//!     fn enabled(&amp;self, metadata: &amp;LogMetadata) -&gt; bool {</span>
+<span class='doccomment'>//!         metadata.level() &lt;= LogLevel::Info</span>
+<span class='doccomment'>//!     }</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//!     fn log(&amp;self, record: &amp;LogRecord) {</span>
+<span class='doccomment'>//!         if self.enabled(record.metadata()) {</span>
+<span class='doccomment'>//!             println!(&quot;{} - {}&quot;, record.level(), record.args());</span>
+<span class='doccomment'>//!         }</span>
+<span class='doccomment'>//!     }</span>
+<span class='doccomment'>//! }</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! # fn main() {}</span>
+<span class='doccomment'>//! ```</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! Loggers are installed by calling the `set_logger` function. It takes a</span>
+<span class='doccomment'>//! closure which is provided a `MaxLogLevel` token and returns a `Log` trait</span>
+<span class='doccomment'>//! object. The `MaxLogLevel` token controls the global maximum log level. The</span>
+<span class='doccomment'>//! logging facade uses this as an optimization to improve performance of log</span>
+<span class='doccomment'>//! messages at levels that are disabled. In the case of our example logger,</span>
+<span class='doccomment'>//! we&#39;ll want to set the maximum log level to `Info`, since we ignore any</span>
+<span class='doccomment'>//! `Debug` or `Trace` level log messages. A logging framework should provide a</span>
+<span class='doccomment'>//! function that wraps a call to `set_logger`, handling initialization of the</span>
+<span class='doccomment'>//! logger:</span>
+<span class='doccomment'>//!</span>
+<span class='doccomment'>//! ```rust</span>
+<span class='doccomment'>//! # extern crate log;</span>
+<span class='doccomment'>//! # use log::{LogLevel, LogLevelFilter, SetLoggerError, LogMetadata};</span>
+<span class='doccomment'>//! # struct SimpleLogger;</span>
+<span class='doccomment'>//! # impl log::Log for SimpleLogger {</span>
+<span class='doccomment'>//! #   fn enabled(&amp;self, _: &amp;LogMetadata) -&gt; bool { false }</span>
+<span class='doccomment'>//! #   fn log(&amp;self, _: &amp;log::LogRecord) {}</span>
+<span class='doccomment'>//! # }</span>
+<span class='doccomment'>//! # fn main() {}</span>
+<span class='doccomment'>//! pub fn init() -&gt; Result&lt;(), SetLoggerError&gt; {</span>
+<span class='doccomment'>//!     log::set_logger(|max_log_level| {</span>
+<span class='doccomment'>//!         max_log_level.set(LogLevelFilter::Info);</span>
+<span class='doccomment'>//!         Box::new(SimpleLogger)</span>
+<span class='doccomment'>//!     })</span>
+<span class='doccomment'>//! }</span>
+<span class='doccomment'>//! ```</span>
+
+<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>doc</span>(<span class='ident'>html_logo_url</span> <span class='op'>=</span> <span class='string'>&quot;http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png&quot;</span>,
+       <span class='ident'>html_favicon_url</span> <span class='op'>=</span> <span class='string'>&quot;http://www.rust-lang.org/favicon.ico&quot;</span>,
+       <span class='ident'>html_root_url</span> <span class='op'>=</span> <span class='string'>&quot;http://doc.rust-lang.org/log/&quot;</span>)]</span>
+<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>warn</span>(<span class='ident'>missing_docs</span>)]</span>
+
+<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>libc</span>;
+
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ascii</span>::<span class='ident'>AsciiExt</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>cmp</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>error</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fmt</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>mem</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'>str</span>::<span class='ident'>FromStr</span>;
+<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::<span class='ident'>atomic</span>::{<span class='ident'>AtomicUsize</span>, <span class='ident'>ATOMIC_USIZE_INIT</span>, <span class='ident'>Ordering</span>};
+<span class='kw'>mod</span> <span class='ident'>macros</span>;
+
+<span class='comment'>// The setup here is a bit weird to make at_exit work.</span>
+<span class='comment'>//</span>
+<span class='comment'>// There are four different states that we care about: the logger&#39;s</span>
+<span class='comment'>// uninitialized, the logger&#39;s initializing (set_logger&#39;s been called but</span>
+<span class='comment'>// LOGGER hasn&#39;t actually been set yet), the logger&#39;s active, or the logger&#39;s</span>
+<span class='comment'>// shutting down inside of at_exit.</span>
+<span class='comment'>//</span>
+<span class='comment'>// The LOGGER static is normally a Box&lt;Box&lt;Log&gt;&gt; with some special possible</span>
+<span class='comment'>// values as well. The uninitialized and initializing states are represented by</span>
+<span class='comment'>// the values 0 and 1 respectively. The shutting down state is also represented</span>
+<span class='comment'>// by 1. Any other value is a valid pointer to the logger.</span>
+<span class='comment'>//</span>
+<span class='comment'>// The at_exit routine needs to make sure that no threads are actively logging</span>
+<span class='comment'>// when it deallocates the logger. The number of actively logging threads is</span>
+<span class='comment'>// tracked in the REFCOUNT static. The routine first sets LOGGER back to 1.</span>
+<span class='comment'>// All logging calls past that point will immediately return without accessing</span>
+<span class='comment'>// the logger. At that point, the at_exit routine just waits for the refcount</span>
+<span class='comment'>// to reach 0 before deallocating the logger. Note that the refcount does not</span>
+<span class='comment'>// necessarily monotonically decrease at this point, as new log calls still</span>
+<span class='comment'>// increment and decrement it, but the interval in between is small enough that</span>
+<span class='comment'>// the wait is really just for the active log calls to finish.</span>
+<span class='kw'>static</span> <span class='ident'>LOGGER</span>: <span class='ident'>AtomicUsize</span> <span class='op'>=</span> <span class='ident'>ATOMIC_USIZE_INIT</span>;
+<span class='kw'>static</span> <span class='ident'>REFCOUNT</span>: <span class='ident'>AtomicUsize</span> <span class='op'>=</span> <span class='ident'>ATOMIC_USIZE_INIT</span>;
+
+<span class='kw'>const</span> <span class='ident'>UNINITIALIZED</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='number'>0</span>;
+<span class='kw'>const</span> <span class='ident'>INITIALIZING</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='number'>1</span>;
+
+<span class='kw'>static</span> <span class='ident'>MAX_LOG_LEVEL_FILTER</span>: <span class='ident'>AtomicUsize</span> <span class='op'>=</span> <span class='ident'>ATOMIC_USIZE_INIT</span>;
+
+<span class='kw'>static</span> <span class='ident'>LOG_LEVEL_NAMES</span>: [<span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> <span class='ident'>str</span>; <span class='number'>6</span>] <span class='op'>=</span> [<span class='string'>&quot;OFF&quot;</span>, <span class='string'>&quot;ERROR&quot;</span>, <span class='string'>&quot;WARN&quot;</span>, <span class='string'>&quot;INFO&quot;</span>,
+                                             <span class='string'>&quot;DEBUG&quot;</span>, <span class='string'>&quot;TRACE&quot;</span>];
+
+<span class='doccomment'>/// An enum representing the available verbosity levels of the logging framework</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// A `LogLevel` may be compared directly to a `LogLevelFilter`.</span>
+<span class='attribute'>#[<span class='ident'>repr</span>(<span class='ident'>usize</span>)]</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Copy</span>, <span class='ident'>Eq</span>, <span class='ident'>Debug</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>LogLevel</span> {
+    <span class='doccomment'>/// The &quot;error&quot; level.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// Designates very serious errors.</span>
+    <span class='ident'>Error</span> <span class='op'>=</span> <span class='number'>1</span>, <span class='comment'>// This way these line up with the discriminants for LogLevelFilter below</span>
+    <span class='doccomment'>/// The &quot;warn&quot; level.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// Designates hazardous situations.</span>
+    <span class='ident'>Warn</span>,
+    <span class='doccomment'>/// The &quot;info&quot; level.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// Designates useful information.</span>
+    <span class='ident'>Info</span>,
+    <span class='doccomment'>/// The &quot;debug&quot; level.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// Designates lower priority information.</span>
+    <span class='ident'>Debug</span>,
+    <span class='doccomment'>/// The &quot;trace&quot; level.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// Designates very low priority, often extremely verbose, information.</span>
+    <span class='ident'>Trace</span>,
+}
+
+<span class='kw'>impl</span> <span class='ident'>Clone</span> <span class='kw'>for</span> <span class='ident'>LogLevel</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</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'>LogLevel</span> {
+        <span class='op'>*</span><span class='self'>self</span>
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialEq</span> <span class='kw'>for</span> <span class='ident'>LogLevel</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>eq</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'>LogLevel</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span> <span class='op'>==</span> <span class='op'>*</span><span class='ident'>other</span> <span class='kw'>as</span> <span class='ident'>usize</span>
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialEq</span><span class='op'>&lt;</span><span class='ident'>LogLevelFilter</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>LogLevel</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>eq</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'>LogLevelFilter</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span> <span class='op'>==</span> <span class='op'>*</span><span class='ident'>other</span> <span class='kw'>as</span> <span class='ident'>usize</span>
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialOrd</span> <span class='kw'>for</span> <span class='ident'>LogLevel</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>partial_cmp</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'>LogLevel</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>cmp</span>::<span class='ident'>Ordering</span><span class='op'>&gt;</span> {
+        <span class='prelude-val'>Some</span>(<span class='self'>self</span>.<span class='ident'>cmp</span>(<span class='ident'>other</span>))
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialOrd</span><span class='op'>&lt;</span><span class='ident'>LogLevelFilter</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>LogLevel</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>partial_cmp</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'>LogLevelFilter</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>cmp</span>::<span class='ident'>Ordering</span><span class='op'>&gt;</span> {
+        <span class='prelude-val'>Some</span>((<span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span>).<span class='ident'>cmp</span>(<span class='kw-2'>&amp;</span>(<span class='op'>*</span><span class='ident'>other</span> <span class='kw'>as</span> <span class='ident'>usize</span>)))
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>Ord</span> <span class='kw'>for</span> <span class='ident'>LogLevel</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>cmp</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'>LogLevel</span>) <span class='op'>-&gt;</span> <span class='ident'>cmp</span>::<span class='ident'>Ordering</span> {
+        (<span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span>).<span class='ident'>cmp</span>(<span class='kw-2'>&amp;</span>(<span class='op'>*</span><span class='ident'>other</span> <span class='kw'>as</span> <span class='ident'>usize</span>))
+    }
+}
+
+<span class='kw'>fn</span> <span class='ident'>ok_or</span><span class='op'>&lt;</span><span class='ident'>T</span>, <span class='ident'>E</span><span class='op'>&gt;</span>(<span class='ident'>t</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>T</span><span class='op'>&gt;</span>, <span class='ident'>e</span>: <span class='ident'>E</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>T</span>, <span class='ident'>E</span><span class='op'>&gt;</span> {
+    <span class='kw'>match</span> <span class='ident'>t</span> {
+        <span class='prelude-val'>Some</span>(<span class='ident'>t</span>) <span class='op'>=&gt;</span> <span class='prelude-val'>Ok</span>(<span class='ident'>t</span>),
+        <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Err</span>(<span class='ident'>e</span>),
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>FromStr</span> <span class='kw'>for</span> <span class='ident'>LogLevel</span> {
+    <span class='kw'>type</span> <span class='prelude-val'>Err</span> <span class='op'>=</span> ();
+    <span class='kw'>fn</span> <span class='ident'>from_str</span>(<span class='ident'>level</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>LogLevel</span>, ()<span class='op'>&gt;</span> {
+        <span class='ident'>ok_or</span>(<span class='ident'>LOG_LEVEL_NAMES</span>.<span class='ident'>iter</span>()
+                    .<span class='ident'>position</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span><span class='ident'>name</span><span class='op'>|</span> <span class='ident'>name</span>.<span class='ident'>eq_ignore_ascii_case</span>(<span class='ident'>level</span>))
+                    .<span class='ident'>into_iter</span>()
+                    .<span class='ident'>filter</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span><span class='ident'>idx</span><span class='op'>|</span> <span class='ident'>idx</span> <span class='op'>!=</span> <span class='number'>0</span>)
+                    .<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>idx</span><span class='op'>|</span> <span class='ident'>LogLevel</span>::<span class='ident'>from_usize</span>(<span class='ident'>idx</span>).<span class='ident'>unwrap</span>())
+                    .<span class='ident'>next</span>(), ())
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>LogLevel</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='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+        <span class='ident'>fmt</span>.<span class='ident'>pad</span>(<span class='ident'>LOG_LEVEL_NAMES</span>[<span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span>])
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>LogLevel</span> {
+    <span class='kw'>fn</span> <span class='ident'>from_usize</span>(<span class='ident'>u</span>: <span class='ident'>usize</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>LogLevel</span><span class='op'>&gt;</span> {
+        <span class='kw'>match</span> <span class='ident'>u</span> {
+            <span class='number'>1</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Error</span>),
+            <span class='number'>2</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Warn</span>),
+            <span class='number'>3</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Info</span>),
+            <span class='number'>4</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Debug</span>),
+            <span class='number'>5</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Trace</span>),
+            _ <span class='op'>=&gt;</span> <span class='prelude-val'>None</span>
+        }
+    }
+
+    <span class='doccomment'>/// Returns the most verbose logging level.</span>
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>max</span>() <span class='op'>-&gt;</span> <span class='ident'>LogLevel</span> {
+        <span class='ident'>LogLevel</span>::<span class='ident'>Trace</span>
+    }
+
+    <span class='doccomment'>/// Converts the `LogLevel` to the equivalent `LogLevelFilter`.</span>
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>to_log_level_filter</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>LogLevelFilter</span> {
+        <span class='ident'>LogLevelFilter</span>::<span class='ident'>from_usize</span>(<span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span>).<span class='ident'>unwrap</span>()
+    }
+}
+
+<span class='doccomment'>/// An enum representing the available verbosity level filters of the logging</span>
+<span class='doccomment'>/// framework.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// A `LogLevelFilter` may be compared directly to a `LogLevel`.</span>
+<span class='attribute'>#[<span class='ident'>repr</span>(<span class='ident'>usize</span>)]</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Copy</span>, <span class='ident'>Eq</span>, <span class='ident'>Debug</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>LogLevelFilter</span> {
+    <span class='doccomment'>/// A level lower than all log levels.</span>
+    <span class='ident'>Off</span>,
+    <span class='doccomment'>/// Corresponds to the `Error` log level.</span>
+    <span class='ident'>Error</span>,
+    <span class='doccomment'>/// Corresponds to the `Warn` log level.</span>
+    <span class='ident'>Warn</span>,
+    <span class='doccomment'>/// Corresponds to the `Trace` log level.</span>
+    <span class='ident'>Info</span>,
+    <span class='doccomment'>/// Corresponds to the `Debug` log level.</span>
+    <span class='ident'>Debug</span>,
+    <span class='doccomment'>/// Corresponds to the `Trace` log level.</span>
+    <span class='ident'>Trace</span>,
+}
+
+<span class='comment'>// Deriving generates terrible impls of these traits</span>
+
+<span class='kw'>impl</span> <span class='ident'>Clone</span> <span class='kw'>for</span> <span class='ident'>LogLevelFilter</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</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'>LogLevelFilter</span> {
+        <span class='op'>*</span><span class='self'>self</span>
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialEq</span> <span class='kw'>for</span> <span class='ident'>LogLevelFilter</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>eq</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'>LogLevelFilter</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span> <span class='op'>==</span> <span class='op'>*</span><span class='ident'>other</span> <span class='kw'>as</span> <span class='ident'>usize</span>
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialEq</span><span class='op'>&lt;</span><span class='ident'>LogLevel</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>LogLevelFilter</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>eq</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'>LogLevel</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+        <span class='ident'>other</span>.<span class='ident'>eq</span>(<span class='self'>self</span>)
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialOrd</span> <span class='kw'>for</span> <span class='ident'>LogLevelFilter</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>partial_cmp</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'>LogLevelFilter</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>cmp</span>::<span class='ident'>Ordering</span><span class='op'>&gt;</span> {
+        <span class='prelude-val'>Some</span>(<span class='self'>self</span>.<span class='ident'>cmp</span>(<span class='ident'>other</span>))
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>PartialOrd</span><span class='op'>&lt;</span><span class='ident'>LogLevel</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='ident'>LogLevelFilter</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>partial_cmp</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'>LogLevel</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>cmp</span>::<span class='ident'>Ordering</span><span class='op'>&gt;</span> {
+        <span class='ident'>other</span>.<span class='ident'>partial_cmp</span>(<span class='self'>self</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='ident'>reverse</span>())
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>Ord</span> <span class='kw'>for</span> <span class='ident'>LogLevelFilter</span> {
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>fn</span> <span class='ident'>cmp</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'>LogLevelFilter</span>) <span class='op'>-&gt;</span> <span class='ident'>cmp</span>::<span class='ident'>Ordering</span> {
+        (<span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span>).<span class='ident'>cmp</span>(<span class='kw-2'>&amp;</span>(<span class='op'>*</span><span class='ident'>other</span> <span class='kw'>as</span> <span class='ident'>usize</span>))
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>FromStr</span> <span class='kw'>for</span> <span class='ident'>LogLevelFilter</span> {
+    <span class='kw'>type</span> <span class='prelude-val'>Err</span> <span class='op'>=</span> ();
+    <span class='kw'>fn</span> <span class='ident'>from_str</span>(<span class='ident'>level</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>LogLevelFilter</span>, ()<span class='op'>&gt;</span> {
+        <span class='ident'>ok_or</span>(<span class='ident'>LOG_LEVEL_NAMES</span>.<span class='ident'>iter</span>()
+                    .<span class='ident'>position</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span><span class='ident'>name</span><span class='op'>|</span> <span class='ident'>name</span>.<span class='ident'>eq_ignore_ascii_case</span>(<span class='ident'>level</span>))
+                    .<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>p</span><span class='op'>|</span> <span class='ident'>LogLevelFilter</span>::<span class='ident'>from_usize</span>(<span class='ident'>p</span>).<span class='ident'>unwrap</span>()), ())
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>LogLevelFilter</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='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+        <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>fmt</span>, <span class='string'>&quot;{}&quot;</span>, <span class='ident'>LOG_LEVEL_NAMES</span>[<span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span>])
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>LogLevelFilter</span> {
+    <span class='kw'>fn</span> <span class='ident'>from_usize</span>(<span class='ident'>u</span>: <span class='ident'>usize</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>LogLevelFilter</span><span class='op'>&gt;</span> {
+        <span class='kw'>match</span> <span class='ident'>u</span> {
+            <span class='number'>0</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Off</span>),
+            <span class='number'>1</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Error</span>),
+            <span class='number'>2</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Warn</span>),
+            <span class='number'>3</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Info</span>),
+            <span class='number'>4</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Debug</span>),
+            <span class='number'>5</span> <span class='op'>=&gt;</span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Trace</span>),
+            _ <span class='op'>=&gt;</span> <span class='prelude-val'>None</span>
+        }
+    }
+    <span class='doccomment'>/// Returns the most verbose logging level filter.</span>
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>max</span>() <span class='op'>-&gt;</span> <span class='ident'>LogLevelFilter</span> {
+        <span class='ident'>LogLevelFilter</span>::<span class='ident'>Trace</span>
+    }
+
+    <span class='doccomment'>/// Converts `self` to the equivalent `LogLevel`.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// Returns `None` if `self` is `LogLevelFilter::Off`.</span>
+    <span class='attribute'>#[<span class='ident'>inline</span>]</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>to_log_level</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'>LogLevel</span><span class='op'>&gt;</span> {
+        <span class='ident'>LogLevel</span>::<span class='ident'>from_usize</span>(<span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span>)
+    }
+}
+
+<span class='doccomment'>/// The &quot;payload&quot; of a log message.</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>LogRecord</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
+    <span class='ident'>metadata</span>: <span class='ident'>LogMetadata</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span>,
+    <span class='ident'>location</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>LogLocation</span>,
+    <span class='ident'>args</span>: <span class='ident'>fmt</span>::<span class='ident'>Arguments</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span>,
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>LogRecord</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
+    <span class='doccomment'>/// The message body.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>args</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'>fmt</span>::<span class='ident'>Arguments</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
+        <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>args</span>
+    }
+
+    <span class='doccomment'>/// Metadata about the log directive.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>metadata</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'>LogMetadata</span> {
+        <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='ident'>metadata</span>
+    }
+
+    <span class='doccomment'>/// The location of the log directive.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>location</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'>LogLocation</span> {
+        <span class='self'>self</span>.<span class='ident'>location</span>
+    }
+
+    <span class='doccomment'>/// The verbosity level of the message.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>level</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>LogLevel</span> {
+        <span class='self'>self</span>.<span class='ident'>metadata</span>.<span class='ident'>level</span>()
+    }
+
+    <span class='doccomment'>/// The name of the target of the directive.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>target</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'>str</span> {
+        <span class='self'>self</span>.<span class='ident'>metadata</span>.<span class='ident'>target</span>()
+    }
+}
+
+<span class='doccomment'>/// Metadata about a log message.</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>LogMetadata</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
+    <span class='ident'>level</span>: <span class='ident'>LogLevel</span>,
+    <span class='ident'>target</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>str</span>,
+}
+
+<span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>LogMetadata</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> {
+    <span class='doccomment'>/// The verbosity level of the message.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>level</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>LogLevel</span> {
+        <span class='self'>self</span>.<span class='ident'>level</span>
+    }
+
+    <span class='doccomment'>/// The name of the target of the directive.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>target</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'>str</span> {
+        <span class='self'>self</span>.<span class='ident'>target</span>
+    }
+}
+
+<span class='doccomment'>/// A trait encapsulating the operations required of a logger</span>
+<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>Log</span>: <span class='ident'>Sync</span><span class='op'>+</span><span class='ident'>Send</span> {
+    <span class='doccomment'>/// Determines if a log message with the specified metadata would be</span>
+    <span class='doccomment'>/// logged.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// This is used by the `log_enabled!` macro to allow callers to avoid</span>
+    <span class='doccomment'>/// expensive computation of log message arguments if the message would be</span>
+    <span class='doccomment'>/// discarded anyway.</span>
+    <span class='kw'>fn</span> <span class='ident'>enabled</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>metadata</span>: <span class='kw-2'>&amp;</span><span class='ident'>LogMetadata</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span>;
+
+    <span class='doccomment'>/// Logs the `LogRecord`.</span>
+    <span class='doccomment'>///</span>
+    <span class='doccomment'>/// Note that `enabled` is *not* necessarily called before this method.</span>
+    <span class='doccomment'>/// Implementations of `log` should perform all necessary filtering</span>
+    <span class='doccomment'>/// internally.</span>
+    <span class='kw'>fn</span> <span class='ident'>log</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>record</span>: <span class='kw-2'>&amp;</span><span class='ident'>LogRecord</span>);
+}
+
+<span class='doccomment'>/// The location of a log message.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// # Warning</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// The fields of this struct are public so that they may be initialized by the</span>
+<span class='doccomment'>/// `log!` macro. They are subject to change at any time and should never be</span>
+<span class='doccomment'>/// accessed directly.</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Copy</span>, <span class='ident'>Clone</span>, <span class='ident'>Debug</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>LogLocation</span> {
+    <span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
+    <span class='kw'>pub</span> <span class='ident'>__module_path</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> <span class='ident'>str</span>,
+    <span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
+    <span class='kw'>pub</span> <span class='ident'>__file</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> <span class='ident'>str</span>,
+    <span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
+    <span class='kw'>pub</span> <span class='ident'>__line</span>: <span class='ident'>u32</span>,
+}
+
+<span class='kw'>impl</span> <span class='ident'>LogLocation</span> {
+    <span class='doccomment'>/// The module path of the message.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>module_path</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'>str</span> {
+        <span class='self'>self</span>.<span class='ident'>__module_path</span>
+    }
+
+    <span class='doccomment'>/// The source file containing the message.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>file</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'>str</span> {
+        <span class='self'>self</span>.<span class='ident'>__file</span>
+    }
+
+    <span class='doccomment'>/// The line containing the message.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>line</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>u32</span> {
+        <span class='self'>self</span>.<span class='ident'>__line</span>
+    }
+}
+
+<span class='doccomment'>/// A token providing read and write access to the global maximum log level</span>
+<span class='doccomment'>/// filter.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// The maximum log level is used as an optimization to avoid evaluating log</span>
+<span class='doccomment'>/// messages that will be ignored by the logger. Any message with a level</span>
+<span class='doccomment'>/// higher than the maximum log level filter will be ignored. A logger should</span>
+<span class='doccomment'>/// make sure to keep the maximum log level filter in sync with its current</span>
+<span class='doccomment'>/// configuration.</span>
+<span class='attribute'>#[<span class='ident'>allow</span>(<span class='ident'>missing_copy_implementations</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>MaxLogLevelFilter</span>(());
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Debug</span> <span class='kw'>for</span> <span class='ident'>MaxLogLevelFilter</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='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+        <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>fmt</span>, <span class='string'>&quot;MaxLogLevelFilter&quot;</span>)
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>MaxLogLevelFilter</span> {
+    <span class='doccomment'>/// Gets the current maximum log level filter.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>get</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>LogLevelFilter</span> {
+        <span class='ident'>max_log_level</span>()
+    }
+
+    <span class='doccomment'>/// Sets the maximum log level.</span>
+    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>set</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>level</span>: <span class='ident'>LogLevelFilter</span>) {
+        <span class='ident'>MAX_LOG_LEVEL_FILTER</span>.<span class='ident'>store</span>(<span class='ident'>level</span> <span class='kw'>as</span> <span class='ident'>usize</span>, <span class='ident'>Ordering</span>::<span class='ident'>SeqCst</span>)
+    }
+}
+
+<span class='doccomment'>/// Returns the current maximum log level.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// The `log!`, `error!`, `warn!`, `info!`, `debug!`, and `trace!` macros check</span>
+<span class='doccomment'>/// this value and discard any message logged at a higher level. The maximum</span>
+<span class='doccomment'>/// log level is set by the `MaxLogLevel` token passed to loggers.</span>
+<span class='attribute'>#[<span class='ident'>inline</span>(<span class='ident'>always</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>max_log_level</span>() <span class='op'>-&gt;</span> <span class='ident'>LogLevelFilter</span> {
+    <span class='kw'>unsafe</span> { <span class='ident'>mem</span>::<span class='ident'>transmute</span>(<span class='ident'>MAX_LOG_LEVEL_FILTER</span>.<span class='ident'>load</span>(<span class='ident'>Ordering</span>::<span class='ident'>Relaxed</span>)) }
+}
+
+<span class='doccomment'>/// Sets the global logger.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// The `make_logger` closure is passed a `MaxLogLevel` object, which the</span>
+<span class='doccomment'>/// logger should use to keep the global maximum log level in sync with the</span>
+<span class='doccomment'>/// highest log level that the logger will not ignore.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// This function may only be called once in the lifetime of a program. Any log</span>
+<span class='doccomment'>/// events that occur before the call to `set_logger` completes will be</span>
+<span class='doccomment'>/// ignored.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// This function does not typically need to be called manually. Logger</span>
+<span class='doccomment'>/// implementations should provide an initialization method that calls</span>
+<span class='doccomment'>/// `set_logger` internally.</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>set_logger</span><span class='op'>&lt;</span><span class='ident'>M</span><span class='op'>&gt;</span>(<span class='ident'>make_logger</span>: <span class='ident'>M</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span>(), <span class='ident'>SetLoggerError</span><span class='op'>&gt;</span>
+        <span class='kw'>where</span> <span class='ident'>M</span>: <span class='ident'>FnOnce</span>(<span class='ident'>MaxLogLevelFilter</span>) <span class='op'>-&gt;</span> <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>Log</span><span class='op'>&gt;</span> {
+    <span class='kw'>if</span> <span class='ident'>LOGGER</span>.<span class='ident'>compare_and_swap</span>(<span class='ident'>UNINITIALIZED</span>, <span class='ident'>INITIALIZING</span>,
+                               <span class='ident'>Ordering</span>::<span class='ident'>SeqCst</span>) <span class='op'>!=</span> <span class='ident'>UNINITIALIZED</span> {
+        <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>SetLoggerError</span>(()));
+    }
+
+    <span class='kw'>let</span> <span class='ident'>logger</span> <span class='op'>=</span> <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>make_logger</span>(<span class='ident'>MaxLogLevelFilter</span>(())));
+    <span class='kw'>let</span> <span class='ident'>logger</span> <span class='op'>=</span> <span class='kw'>unsafe</span> { <span class='ident'>mem</span>::<span class='ident'>transmute</span>::<span class='op'>&lt;</span><span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>Log</span><span class='op'>&gt;&gt;</span>, <span class='ident'>usize</span><span class='op'>&gt;</span>(<span class='ident'>logger</span>) };
+    <span class='ident'>LOGGER</span>.<span class='ident'>store</span>(<span class='ident'>logger</span>, <span class='ident'>Ordering</span>::<span class='ident'>SeqCst</span>);
+
+    <span class='kw'>unsafe</span> {
+        <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>libc</span>::<span class='ident'>atexit</span>(<span class='ident'>shutdown</span>), <span class='number'>0</span>);
+    }
+    <span class='kw'>return</span> <span class='prelude-val'>Ok</span>(());
+
+    <span class='kw'>extern</span> <span class='kw'>fn</span> <span class='ident'>shutdown</span>() {
+        <span class='comment'>// Set to INITIALIZING to prevent re-initialization after</span>
+        <span class='kw'>let</span> <span class='ident'>logger</span> <span class='op'>=</span> <span class='ident'>LOGGER</span>.<span class='ident'>swap</span>(<span class='ident'>INITIALIZING</span>, <span class='ident'>Ordering</span>::<span class='ident'>SeqCst</span>);
+
+        <span class='kw'>while</span> <span class='ident'>REFCOUNT</span>.<span class='ident'>load</span>(<span class='ident'>Ordering</span>::<span class='ident'>SeqCst</span>) <span class='op'>!=</span> <span class='number'>0</span> {
+            <span class='comment'>// FIXME add a sleep here when it doesn&#39;t involve timers</span>
+        }
+
+        <span class='kw'>unsafe</span> { <span class='ident'>mem</span>::<span class='ident'>transmute</span>::<span class='op'>&lt;</span><span class='ident'>usize</span>, <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>Log</span><span class='op'>&gt;&gt;</span><span class='op'>&gt;</span>(<span class='ident'>logger</span>); }
+    }
+}
+
+<span class='doccomment'>/// The type returned by `set_logger` if `set_logger` has already been called.</span>
+<span class='attribute'>#[<span class='ident'>allow</span>(<span class='ident'>missing_copy_implementations</span>)]</span>
+<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>SetLoggerError</span>(());
+
+<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>SetLoggerError</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='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
+        <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>fmt</span>, <span class='string'>&quot;attempted to set a logger after the logging system \
+                     was already initialized&quot;</span>)
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>error</span>::<span class='ident'>Error</span> <span class='kw'>for</span> <span class='ident'>SetLoggerError</span> {
+    <span class='kw'>fn</span> <span class='ident'>description</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'>str</span> { <span class='string'>&quot;set_logger() called multiple times&quot;</span> }
+}
+
+<span class='kw'>struct</span> <span class='ident'>LoggerGuard</span>(<span class='ident'>usize</span>);
+
+<span class='kw'>impl</span> <span class='ident'>Drop</span> <span class='kw'>for</span> <span class='ident'>LoggerGuard</span> {
+    <span class='kw'>fn</span> <span class='ident'>drop</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) {
+        <span class='ident'>REFCOUNT</span>.<span class='ident'>fetch_sub</span>(<span class='number'>1</span>, <span class='ident'>Ordering</span>::<span class='ident'>SeqCst</span>);
+    }
+}
+
+<span class='kw'>impl</span> <span class='ident'>Deref</span> <span class='kw'>for</span> <span class='ident'>LoggerGuard</span> {
+    <span class='kw'>type</span> <span class='ident'>Target</span> <span class='op'>=</span> <span class='ident'>Box</span><span class='op'>&lt;</span><span class='ident'>Log</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'>Box</span><span class='op'>&lt;</span><span class='ident'>Log</span><span class='op'>+</span><span class='lifetime'>&#39;static</span><span class='op'>&gt;</span> {
+        <span class='kw'>unsafe</span> { <span class='ident'>mem</span>::<span class='ident'>transmute</span>(<span class='self'>self</span>.<span class='number'>0</span>) }
+    }
+}
+
+<span class='kw'>fn</span> <span class='ident'>logger</span>() <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>LoggerGuard</span><span class='op'>&gt;</span> {
+    <span class='ident'>REFCOUNT</span>.<span class='ident'>fetch_add</span>(<span class='number'>1</span>, <span class='ident'>Ordering</span>::<span class='ident'>SeqCst</span>);
+    <span class='kw'>let</span> <span class='ident'>logger</span> <span class='op'>=</span> <span class='ident'>LOGGER</span>.<span class='ident'>load</span>(<span class='ident'>Ordering</span>::<span class='ident'>SeqCst</span>);
+    <span class='kw'>if</span> <span class='ident'>logger</span> <span class='op'>==</span> <span class='ident'>UNINITIALIZED</span> <span class='op'>||</span> <span class='ident'>logger</span> <span class='op'>==</span> <span class='ident'>INITIALIZING</span> {
+        <span class='ident'>REFCOUNT</span>.<span class='ident'>fetch_sub</span>(<span class='number'>1</span>, <span class='ident'>Ordering</span>::<span class='ident'>SeqCst</span>);
+        <span class='prelude-val'>None</span>
+    } <span class='kw'>else</span> {
+        <span class='prelude-val'>Some</span>(<span class='ident'>LoggerGuard</span>(<span class='ident'>logger</span>))
+    }
+}
+
+<span class='comment'>// WARNING</span>
+<span class='comment'>// This is not considered part of the crate&#39;s public API. It is subject to</span>
+<span class='comment'>// change at any time.</span>
+<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>__enabled</span>(<span class='ident'>level</span>: <span class='ident'>LogLevel</span>, <span class='ident'>target</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
+    <span class='kw'>if</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>(<span class='ident'>logger</span>) <span class='op'>=</span> <span class='ident'>logger</span>() {
+        <span class='ident'>logger</span>.<span class='ident'>enabled</span>(<span class='kw-2'>&amp;</span><span class='ident'>LogMetadata</span> { <span class='ident'>level</span>: <span class='ident'>level</span>, <span class='ident'>target</span>: <span class='ident'>target</span> })
+    } <span class='kw'>else</span> {
+        <span class='boolval'>false</span>
+    }
+}
+
+<span class='comment'>// WARNING</span>
+<span class='comment'>// This is not considered part of the crate&#39;s public API. It is subject to</span>
+<span class='comment'>// change at any time.</span>
+<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
+<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>__log</span>(<span class='ident'>level</span>: <span class='ident'>LogLevel</span>, <span class='ident'>target</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>, <span class='ident'>loc</span>: <span class='kw-2'>&amp;</span><span class='ident'>LogLocation</span>,
+             <span class='ident'>args</span>: <span class='ident'>fmt</span>::<span class='ident'>Arguments</span>) {
+    <span class='kw'>if</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>(<span class='ident'>logger</span>) <span class='op'>=</span> <span class='ident'>logger</span>() {
+        <span class='kw'>let</span> <span class='ident'>record</span> <span class='op'>=</span> <span class='ident'>LogRecord</span> {
+            <span class='ident'>metadata</span>: <span class='ident'>LogMetadata</span> {
+                <span class='ident'>level</span>: <span class='ident'>level</span>,
+                <span class='ident'>target</span>: <span class='ident'>target</span>,
+            },
+            <span class='ident'>location</span>: <span class='ident'>loc</span>,
+            <span class='ident'>args</span>: <span class='ident'>args</span>
+        };
+        <span class='ident'>logger</span>.<span class='ident'>log</span>(<span class='kw-2'>&amp;</span><span class='ident'>record</span>)
+    }
+}
+
+<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
+<span class='kw'>mod</span> <span class='ident'>tests</span> {
+     <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>error</span>::<span class='ident'>Error</span>;
+     <span class='kw'>use</span> <span class='ident'>super</span>::{<span class='ident'>LogLevel</span>, <span class='ident'>LogLevelFilter</span>, <span class='ident'>SetLoggerError</span>};
+
+     <span class='attribute'>#[<span class='ident'>test</span>]</span>
+     <span class='kw'>fn</span> <span class='ident'>test_loglevelfilter_from_str</span>() {
+         <span class='kw'>let</span> <span class='ident'>tests</span> <span class='op'>=</span> [
+             (<span class='string'>&quot;off&quot;</span>,   <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Off</span>)),
+             (<span class='string'>&quot;error&quot;</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Error</span>)),
+             (<span class='string'>&quot;warn&quot;</span>,  <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Warn</span>)),
+             (<span class='string'>&quot;info&quot;</span>,  <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Info</span>)),
+             (<span class='string'>&quot;debug&quot;</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Debug</span>)),
+             (<span class='string'>&quot;trace&quot;</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Trace</span>)),
+             (<span class='string'>&quot;OFF&quot;</span>,   <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Off</span>)),
+             (<span class='string'>&quot;ERROR&quot;</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Error</span>)),
+             (<span class='string'>&quot;WARN&quot;</span>,  <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Warn</span>)),
+             (<span class='string'>&quot;INFO&quot;</span>,  <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Info</span>)),
+             (<span class='string'>&quot;DEBUG&quot;</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Debug</span>)),
+             (<span class='string'>&quot;TRACE&quot;</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Trace</span>)),
+             (<span class='string'>&quot;asdf&quot;</span>,  <span class='prelude-val'>Err</span>(())),
+         ];
+         <span class='kw'>for</span> <span class='kw-2'>&amp;</span>(<span class='ident'>s</span>, <span class='kw-2'>ref</span> <span class='ident'>expected</span>) <span class='kw'>in</span> <span class='kw-2'>&amp;</span><span class='ident'>tests</span> {
+             <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>expected</span>, <span class='kw-2'>&amp;</span><span class='ident'>s</span>.<span class='ident'>parse</span>());
+         }
+     }
+
+     <span class='attribute'>#[<span class='ident'>test</span>]</span>
+     <span class='kw'>fn</span> <span class='ident'>test_loglevel_from_str</span>() {
+         <span class='kw'>let</span> <span class='ident'>tests</span> <span class='op'>=</span> [
+             (<span class='string'>&quot;OFF&quot;</span>,   <span class='prelude-val'>Err</span>(())),
+             (<span class='string'>&quot;error&quot;</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Error</span>)),
+             (<span class='string'>&quot;warn&quot;</span>,  <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Warn</span>)),
+             (<span class='string'>&quot;info&quot;</span>,  <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Info</span>)),
+             (<span class='string'>&quot;debug&quot;</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Debug</span>)),
+             (<span class='string'>&quot;trace&quot;</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Trace</span>)),
+             (<span class='string'>&quot;ERROR&quot;</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Error</span>)),
+             (<span class='string'>&quot;WARN&quot;</span>,  <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Warn</span>)),
+             (<span class='string'>&quot;INFO&quot;</span>,  <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Info</span>)),
+             (<span class='string'>&quot;DEBUG&quot;</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Debug</span>)),
+             (<span class='string'>&quot;TRACE&quot;</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Trace</span>)),
+             (<span class='string'>&quot;asdf&quot;</span>,  <span class='prelude-val'>Err</span>(())),
+         ];
+         <span class='kw'>for</span> <span class='kw-2'>&amp;</span>(<span class='ident'>s</span>, <span class='kw-2'>ref</span> <span class='ident'>expected</span>) <span class='kw'>in</span> <span class='kw-2'>&amp;</span><span class='ident'>tests</span> {
+             <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>expected</span>, <span class='kw-2'>&amp;</span><span class='ident'>s</span>.<span class='ident'>parse</span>());
+         }
+     }
+
+     <span class='attribute'>#[<span class='ident'>test</span>]</span>
+     <span class='kw'>fn</span> <span class='ident'>test_loglevel_show</span>() {
+         <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>&quot;INFO&quot;</span>, <span class='ident'>LogLevel</span>::<span class='ident'>Info</span>.<span class='ident'>to_string</span>());
+         <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>&quot;ERROR&quot;</span>, <span class='ident'>LogLevel</span>::<span class='ident'>Error</span>.<span class='ident'>to_string</span>());
+     }
+
+     <span class='attribute'>#[<span class='ident'>test</span>]</span>
+     <span class='kw'>fn</span> <span class='ident'>test_loglevelfilter_show</span>() {
+         <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>&quot;OFF&quot;</span>, <span class='ident'>LogLevelFilter</span>::<span class='ident'>Off</span>.<span class='ident'>to_string</span>());
+         <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>&quot;ERROR&quot;</span>, <span class='ident'>LogLevelFilter</span>::<span class='ident'>Error</span>.<span class='ident'>to_string</span>());
+     }
+
+     <span class='attribute'>#[<span class='ident'>test</span>]</span>
+     <span class='kw'>fn</span> <span class='ident'>test_cross_cmp</span>() {
+         <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Debug</span> <span class='op'>&gt;</span> <span class='ident'>LogLevelFilter</span>::<span class='ident'>Error</span>);
+         <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Warn</span> <span class='op'>&lt;</span> <span class='ident'>LogLevel</span>::<span class='ident'>Trace</span>);
+         <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Off</span> <span class='op'>&lt;</span> <span class='ident'>LogLevel</span>::<span class='ident'>Error</span>);
+     }
+
+     <span class='attribute'>#[<span class='ident'>test</span>]</span>
+     <span class='kw'>fn</span> <span class='ident'>test_cross_eq</span>() {
+         <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Error</span> <span class='op'>==</span> <span class='ident'>LogLevelFilter</span>::<span class='ident'>Error</span>);
+         <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Off</span> <span class='op'>!=</span> <span class='ident'>LogLevel</span>::<span class='ident'>Error</span>);
+         <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Trace</span> <span class='op'>==</span> <span class='ident'>LogLevelFilter</span>::<span class='ident'>Trace</span>);
+     }
+
+     <span class='attribute'>#[<span class='ident'>test</span>]</span>
+     <span class='kw'>fn</span> <span class='ident'>test_to_log_level</span>() {
+         <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Error</span>), <span class='ident'>LogLevelFilter</span>::<span class='ident'>Error</span>.<span class='ident'>to_log_level</span>());
+         <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>None</span>, <span class='ident'>LogLevelFilter</span>::<span class='ident'>Off</span>.<span class='ident'>to_log_level</span>());
+         <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Debug</span>), <span class='ident'>LogLevelFilter</span>::<span class='ident'>Debug</span>.<span class='ident'>to_log_level</span>());
+     }
+
+     <span class='attribute'>#[<span class='ident'>test</span>]</span>
+     <span class='kw'>fn</span> <span class='ident'>test_to_log_level_filter</span>() {
+         <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Error</span>, <span class='ident'>LogLevel</span>::<span class='ident'>Error</span>.<span class='ident'>to_log_level_filter</span>());
+         <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Trace</span>, <span class='ident'>LogLevel</span>::<span class='ident'>Trace</span>.<span class='ident'>to_log_level_filter</span>());
+     }
+
+     <span class='attribute'>#[<span class='ident'>test</span>]</span>
+     <span class='kw'>fn</span> <span class='ident'>test_error_trait</span>() {
+         <span class='kw'>let</span> <span class='ident'>e</span> <span class='op'>=</span> <span class='ident'>SetLoggerError</span>(());
+         <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>e</span>.<span class='ident'>description</span>(), <span class='string'>&quot;set_logger() called multiple times&quot;</span>);
+     }
+}
+</pre>
+</section>
+    <section id='search' class="content hidden"></section>
+
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+
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+        <div class="shortcuts">
+            <h1>Keyboard shortcuts</h1>
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+                Prefix searches with a type followed by a colon (e.g.
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+                Accepted types are: <code>fn</code>, <code>mod</code>,
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+                Search functions by type signature (e.g.
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+\ No newline at end of file
diff --git a/src/log/macros.rs.html b/src/log/macros.rs.html
new file mode 100644
index 0000000..cd4dd2a
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+++ b/src/log/macros.rs.html
@@ -0,0 +1,387 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
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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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+        This old browser is unsupported and will most likely display funky
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+        <a href='../../log/index.html'><img src='http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='' width='100'></a>
+        
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+
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+                <input class="search-input" name="search"
+                       autocomplete="off"
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+                       type="search">
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+        </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>
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+<span id="98"> 98</span>
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+<span id="103">103</span>
+<span id="104">104</span>
+<span id="105">105</span>
+<span id="106">106</span>
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+<span id="109">109</span>
+<span id="110">110</span>
+<span id="111">111</span>
+<span id="112">112</span>
+<span id="113">113</span>
+<span id="114">114</span>
+<span id="115">115</span>
+<span id="116">116</span>
+<span id="117">117</span>
+<span id="118">118</span>
+<span id="119">119</span>
+<span id="120">120</span>
+<span id="121">121</span>
+<span id="122">122</span>
+<span id="123">123</span>
+<span id="124">124</span>
+<span id="125">125</span>
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+<span id="141">141</span>
+<span id="142">142</span>
+<span id="143">143</span>
+<span id="144">144</span>
+<span id="145">145</span>
+</pre><pre class='rust '>
+<span class='comment'>// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT</span>
+<span class='comment'>// file at the top-level directory of this distribution and at</span>
+<span class='comment'>// http://rust-lang.org/COPYRIGHT.</span>
+<span class='comment'>//</span>
+<span class='comment'>// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
+<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
+<span class='comment'>// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
+<span class='comment'>// option. This file may not be copied, modified, or distributed</span>
+<span class='comment'>// except according to those terms.</span>
+<span class='doccomment'>/// The standard logging macro.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// This macro will generically log with the specified `LogLevel` and `format!`</span>
+<span class='doccomment'>/// based argument list.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// The `log_level` cfg can be used to statically disable logging at various</span>
+<span class='doccomment'>/// levels.</span>
+<span class='attribute'>#[<span class='ident'>macro_export</span>]</span>
+<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>log</span> {
+    (<span class='ident'>target</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>:<span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>lvl</span>:<span class='ident'>expr</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>tt</span>)<span class='op'>+</span>) <span class='op'>=&gt;</span> ({
+        <span class='kw'>static</span> <span class='ident'>LOC</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLocation</span> <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLocation</span> {
+            <span class='ident'>__line</span>: <span class='macro'>line</span><span class='macro'>!</span>(),
+            <span class='ident'>__file</span>: <span class='macro'>file</span><span class='macro'>!</span>(),
+            <span class='ident'>__module_path</span>: <span class='macro'>module_path</span><span class='macro'>!</span>(),
+        };
+        <span class='kw'>let</span> <span class='ident'>lvl</span> <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>lvl</span>;
+        <span class='kw'>if</span> <span class='op'>!</span><span class='macro'>cfg</span><span class='macro'>!</span>(<span class='ident'>log_level</span> <span class='op'>=</span> <span class='string'>&quot;off&quot;</span>) <span class='op'>&amp;&amp;</span>
+                (<span class='ident'>lvl</span> <span class='op'>&lt;=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Error</span> <span class='op'>||</span> <span class='op'>!</span><span class='macro'>cfg</span><span class='macro'>!</span>(<span class='ident'>log_level</span> <span class='op'>=</span> <span class='string'>&quot;error&quot;</span>)) <span class='op'>&amp;&amp;</span>
+                (<span class='ident'>lvl</span> <span class='op'>&lt;=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Warn</span> <span class='op'>||</span> <span class='op'>!</span><span class='macro'>cfg</span><span class='macro'>!</span>(<span class='ident'>log_level</span> <span class='op'>=</span> <span class='string'>&quot;warn&quot;</span>)) <span class='op'>&amp;&amp;</span>
+                (<span class='ident'>lvl</span> <span class='op'>&lt;=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Debug</span> <span class='op'>||</span> <span class='op'>!</span><span class='macro'>cfg</span><span class='macro'>!</span>(<span class='ident'>log_level</span> <span class='op'>=</span> <span class='string'>&quot;debug&quot;</span>)) <span class='op'>&amp;&amp;</span>
+                (<span class='ident'>lvl</span> <span class='op'>&lt;=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Info</span> <span class='op'>||</span> <span class='op'>!</span><span class='macro'>cfg</span><span class='macro'>!</span>(<span class='ident'>log_level</span> <span class='op'>=</span> <span class='string'>&quot;info&quot;</span>)) <span class='op'>&amp;&amp;</span>
+                <span class='ident'>lvl</span> <span class='op'>&lt;=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>max_log_level</span>() {
+            <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>__log</span>(<span class='ident'>lvl</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>, <span class='kw-2'>&amp;</span><span class='ident'>LOC</span>, <span class='macro'>format_args</span><span class='macro'>!</span>($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='op'>+</span>))
+        }
+    });
+    (<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>lvl</span>:<span class='ident'>expr</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>tt</span>)<span class='op'>+</span>) <span class='op'>=&gt;</span> (<span class='macro'>log</span><span class='macro'>!</span>(<span class='ident'>target</span>: <span class='macro'>module_path</span><span class='macro'>!</span>(), <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>lvl</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='op'>+</span>))
+}
+
+<span class='doccomment'>/// Logs a message at the error level.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Logging at this level is disabled if the `log_level = &quot;off&quot;` cfg is</span>
+<span class='doccomment'>/// present.</span>
+<span class='attribute'>#[<span class='ident'>macro_export</span>]</span>
+<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>error</span> {
+    (<span class='ident'>target</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>:<span class='ident'>expr</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>tt</span>)<span class='op'>*</span>) <span class='op'>=&gt;</span> (
+        <span class='macro'>log</span><span class='macro'>!</span>(<span class='ident'>target</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Error</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='op'>*</span>);
+    );
+    ($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>tt</span>)<span class='op'>*</span>) <span class='op'>=&gt;</span> (
+        <span class='macro'>log</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Error</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='op'>*</span>);
+    )
+}
+
+<span class='doccomment'>/// Logs a message at the warn level.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Logging at this level is disabled if any of the following cfgs are present:</span>
+<span class='doccomment'>/// `log_level = &quot;off&quot;` or `log_level = &quot;error&quot;`.</span>
+<span class='attribute'>#[<span class='ident'>macro_export</span>]</span>
+<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>warn</span> {
+    (<span class='ident'>target</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>:<span class='ident'>expr</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>tt</span>)<span class='op'>*</span>) <span class='op'>=&gt;</span> (
+        <span class='macro'>log</span><span class='macro'>!</span>(<span class='ident'>target</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Warn</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='op'>*</span>);
+    );
+    ($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>tt</span>)<span class='op'>*</span>) <span class='op'>=&gt;</span> (
+        <span class='macro'>log</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Warn</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='op'>*</span>);
+    )
+}
+
+<span class='doccomment'>/// Logs a message at the info level.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Logging at this level is disabled if any of the following cfgs are present:</span>
+<span class='doccomment'>/// `log_level = &quot;off&quot;`, `log_level = &quot;error&quot;`, or</span>
+<span class='doccomment'>/// `log_level = &quot;warn&quot;`.</span>
+<span class='attribute'>#[<span class='ident'>macro_export</span>]</span>
+<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>info</span> {
+    (<span class='ident'>target</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>:<span class='ident'>expr</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>tt</span>)<span class='op'>*</span>) <span class='op'>=&gt;</span> (
+        <span class='macro'>log</span><span class='macro'>!</span>(<span class='ident'>target</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Info</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='op'>*</span>);
+    );
+    ($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>tt</span>)<span class='op'>*</span>) <span class='op'>=&gt;</span> (
+        <span class='macro'>log</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Info</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='op'>*</span>);
+    )
+}
+
+<span class='doccomment'>/// Logs a message at the debug level.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Logging at this level is disabled if any of the following cfgs are present:</span>
+<span class='doccomment'>/// `log_level = &quot;off&quot;`, `log_level = &quot;error&quot;`, `log_level = &quot;warn&quot;`,</span>
+<span class='doccomment'>/// or `log_level = &quot;info&quot;`.</span>
+<span class='attribute'>#[<span class='ident'>macro_export</span>]</span>
+<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>debug</span> {
+    (<span class='ident'>target</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>:<span class='ident'>expr</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>tt</span>)<span class='op'>*</span>) <span class='op'>=&gt;</span> (
+        <span class='macro'>log</span><span class='macro'>!</span>(<span class='ident'>target</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Debug</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='op'>*</span>);
+    );
+    ($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>tt</span>)<span class='op'>*</span>) <span class='op'>=&gt;</span> (
+        <span class='macro'>log</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Debug</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='op'>*</span>);
+    )
+}
+
+<span class='doccomment'>/// Logs a message at the trace level.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// Logging at this level is disabled if any of the following cfgs are present:</span>
+<span class='doccomment'>/// `log_level = &quot;off&quot;`, `log_level = &quot;error&quot;`, `log_level = &quot;warn&quot;`,</span>
+<span class='doccomment'>/// `log_level = &quot;info&quot;`, or `log_level = &quot;debug&quot;`.</span>
+<span class='attribute'>#[<span class='ident'>macro_export</span>]</span>
+<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>trace</span> {
+    (<span class='ident'>target</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>:<span class='ident'>expr</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>tt</span>)<span class='op'>*</span>) <span class='op'>=&gt;</span> (
+        <span class='macro'>log</span><span class='macro'>!</span>(<span class='ident'>target</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Trace</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='op'>*</span>);
+    );
+    ($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>tt</span>)<span class='op'>*</span>) <span class='op'>=&gt;</span> (
+        <span class='macro'>log</span><span class='macro'>!</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Trace</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>)<span class='op'>*</span>);
+    )
+}
+
+<span class='doccomment'>/// Determines if a message logged at the specified level in that module will</span>
+<span class='doccomment'>/// be logged.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// This can be used to avoid expensive computation of log message arguments if</span>
+<span class='doccomment'>/// the message would be ignored anyway.</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// # Examples</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// ```rust</span>
+<span class='doccomment'>/// # #[macro_use]</span>
+<span class='doccomment'>/// # extern crate log;</span>
+<span class='doccomment'>/// use log::LogLevel::Debug;</span>
+<span class='doccomment'>///</span>
+<span class='doccomment'>/// # fn foo() {</span>
+<span class='doccomment'>/// if log_enabled!(Debug) {</span>
+<span class='doccomment'>///     debug!(&quot;expensive debug data: {}&quot;, expensive_call());</span>
+<span class='doccomment'>/// }</span>
+<span class='doccomment'>/// # }</span>
+<span class='doccomment'>/// # fn expensive_call() -&gt; u32 { 0 }</span>
+<span class='doccomment'>/// # fn main() {}</span>
+<span class='doccomment'>/// ```</span>
+<span class='attribute'>#[<span class='ident'>macro_export</span>]</span>
+<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>log_enabled</span> {
+    (<span class='ident'>target</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>:<span class='ident'>expr</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>lvl</span>:<span class='ident'>expr</span>) <span class='op'>=&gt;</span> ({
+        <span class='kw'>let</span> <span class='ident'>lvl</span> <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>lvl</span>;
+        <span class='op'>!</span><span class='macro'>cfg</span><span class='macro'>!</span>(<span class='ident'>log_level</span> <span class='op'>=</span> <span class='string'>&quot;off&quot;</span>) <span class='op'>&amp;&amp;</span>
+            (<span class='ident'>lvl</span> <span class='op'>&lt;=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Error</span> <span class='op'>||</span> <span class='op'>!</span><span class='macro'>cfg</span><span class='macro'>!</span>(<span class='ident'>log_level</span> <span class='op'>=</span> <span class='string'>&quot;error&quot;</span>)) <span class='op'>&amp;&amp;</span>
+            (<span class='ident'>lvl</span> <span class='op'>&lt;=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Warn</span> <span class='op'>||</span> <span class='op'>!</span><span class='macro'>cfg</span><span class='macro'>!</span>(<span class='ident'>log_level</span> <span class='op'>=</span> <span class='string'>&quot;warn&quot;</span>)) <span class='op'>&amp;&amp;</span>
+            (<span class='ident'>lvl</span> <span class='op'>&lt;=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Debug</span> <span class='op'>||</span> <span class='op'>!</span><span class='macro'>cfg</span><span class='macro'>!</span>(<span class='ident'>log_level</span> <span class='op'>=</span> <span class='string'>&quot;debug&quot;</span>)) <span class='op'>&amp;&amp;</span>
+            (<span class='ident'>lvl</span> <span class='op'>&lt;=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>LogLevel</span>::<span class='ident'>Info</span> <span class='op'>||</span> <span class='op'>!</span><span class='macro'>cfg</span><span class='macro'>!</span>(<span class='ident'>log_level</span> <span class='op'>=</span> <span class='string'>&quot;info&quot;</span>)) <span class='op'>&amp;&amp;</span>
+            <span class='ident'>lvl</span> <span class='op'>&lt;=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>max_log_level</span>() <span class='op'>&amp;&amp;</span>
+            <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>crate</span>::<span class='ident'>__enabled</span>(<span class='ident'>lvl</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>target</span>)
+    });
+    (<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>lvl</span>:<span class='ident'>expr</span>) <span class='op'>=&gt;</span> (<span class='macro'>log_enabled</span><span class='macro'>!</span>(<span class='ident'>target</span>: <span class='macro'>module_path</span><span class='macro'>!</span>(), <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>lvl</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.
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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/log
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