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<section id='main' class="content"><pre class="line-numbers"><span id="1">1</span>
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</pre><pre class="rust ">
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">try_none</span> {
( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">x</span>:<span class="ident">expr</span> ) <span class="op">=></span> {{
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}
}}
}
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