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<h1 class='fqn'><span class='in-band'><a href='index.html'>log</a>::<wbr><a class='macro' href=''>warn!</a></span><span class='out-of-band'><span id='render-detail'>
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<pre class='rust macro'>
<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'>=></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'>=></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>);
)
}
</pre>
<div class='docblock'><p>Logs a message at the warn level.</p>
<p>Logging at this level is disabled if any of the following cfgs are present:
<code>log_level = "off"</code> or <code>log_level = "error"</code>.</p>
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