132 lines
5.7 KiB
HTML
132 lines
5.7 KiB
HTML
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<a href='../log/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a>
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<p class='location'><a href='index.html'>log</a></p><script>window.sidebarCurrent = {name: 'warn', ty: 'macro', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<h1 class='fqn'><span class='in-band'>Macro <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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</span><a class='srclink' href='../src/log/macros.rs.html#98-105' title='goto source code'>[src]</a></span></h1>
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<pre class="rust macro">
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<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">warn</span> {
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(<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="kw-2">*</span>) <span class="op">=></span> { ... };
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($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=></span> { ... };
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}</pre>
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<div class='docblock'><p>Logs a message at the warn level.</p>
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<p>Logging at this level is disabled if any of the following features are
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present: <code>max_level_off</code> or <code>max_level_error</code>.</p>
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<p>When building in release mode (i.e., without the <code>debug_assertions</code> option),
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logging at this level is also disabled if any of the following features are
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present: <code>release_max_level_off</code> or <code>max_level_error</code>.</p>
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<h1 id='examples' class='section-header'><a href='#examples'>Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">let</span> <span class="ident">warn_description</span> <span class="op">=</span> <span class="string">"Invalid Input"</span>;
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<span class="macro">warn</span><span class="macro">!</span>(<span class="string">"Warning! {}!"</span>, <span class="ident">warn_description</span>);
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<span class="macro">warn</span><span class="macro">!</span>(<span class="ident">target</span>: <span class="string">"input_events"</span>, <span class="string">"App received warning: {}"</span>, <span class="ident">warn_description</span>);</pre>
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