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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">/// A macro for defining #[cfg] if-else statements.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is similar to the `if/elif` C preprocessor macro by allowing definition</span>
<span class="doccomment">/// of a cascade of `#[cfg]` cases, emitting the implementation which matches</span>
<span class="doccomment">/// first.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This allows you to conveniently provide a long list #[cfg]'d blocks of code</span>
<span class="doccomment">/// without having to rewrite each clause multiple times.</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_macros</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">cfg_if</span> {
<span class="comment">// match if/else chains with a final `else`</span>
($(
<span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">meta</span>:<span class="ident">meta</span>),<span class="kw-2">*</span>)]</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">it</span>:<span class="ident">item</span>)<span class="op">*</span> }
) <span class="kw">else</span> <span class="op">*</span> <span class="kw">else</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">it2</span>:<span class="ident">item</span>)<span class="op">*</span>
}) <span class="op">=</span><span class="op">></span> {
<span class="macro">cfg_if</span><span class="macro">!</span> {
@<span class="ident">__items</span>
() ;
$( ( ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">meta</span>),<span class="kw-2">*</span>) ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">it</span>)<span class="kw-2">*</span>) ), )<span class="op">*</span>
( () ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">it2</span>)<span class="kw-2">*</span>) ),
}
};
<span class="comment">// match if/else chains lacking a final `else`</span>
(
<span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i_met</span>:<span class="ident">meta</span>),<span class="kw-2">*</span>)]</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i_it</span>:<span class="ident">item</span>)<span class="op">*</span> }
$(
<span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e_met</span>:<span class="ident">meta</span>),<span class="kw-2">*</span>)]</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e_it</span>:<span class="ident">item</span>)<span class="op">*</span> }
)<span class="op">*</span>
) <span class="op">=</span><span class="op">></span> {
<span class="macro">cfg_if</span><span class="macro">!</span> {
@<span class="ident">__items</span>
() ;
( ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i_met</span>),<span class="kw-2">*</span>) ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i_it</span>)<span class="kw-2">*</span>) ),
$( ( ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e_met</span>),<span class="kw-2">*</span>) ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e_it</span>)<span class="kw-2">*</span>) ), )<span class="op">*</span>
( () () ),
}
};
<span class="comment">// Internal and recursive macro to emit all the items</span>
<span class="comment">//</span>
<span class="comment">// Collects all the negated `cfg`s in a list at the beginning and after the</span>
<span class="comment">// semicolon is all the remaining items</span>
(@<span class="ident">__items</span> ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">not</span>:<span class="ident">meta</span>,)<span class="kw-2">*</span>) ; ) <span class="op">=</span><span class="op">></span> {};
(@<span class="ident">__items</span> ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">not</span>:<span class="ident">meta</span>,)<span class="kw-2">*</span>) ; ( ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">m</span>:<span class="ident">meta</span>),<span class="kw-2">*</span>) ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">it</span>:<span class="ident">item</span>)<span class="kw-2">*</span>) ),
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {
<span class="comment">// Emit all items within one block, applying an appropriate #[cfg]. The</span>
<span class="comment">// #[cfg] will require all `$m` matchers specified and must also negate</span>
<span class="comment">// all previous matchers.</span>
<span class="macro">cfg_if</span><span class="macro">!</span> { @<span class="ident">__apply</span> <span class="ident">cfg</span>(<span class="ident">all</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">m</span>,)<span class="op">*</span> <span class="ident">not</span>(<span class="ident">any</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">not</span>),<span class="kw-2">*</span>)))), $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">it</span>)<span class="op">*</span> }
<span class="comment">// Recurse to emit all other items in `$rest`, and when we do so add all</span>
<span class="comment">// our `$m` matchers to the list of `$not` matchers as future emissions</span>
<span class="comment">// will have to negate everything we just matched as well.</span>
<span class="macro">cfg_if</span><span class="macro">!</span> { @<span class="ident">__items</span> ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">not</span>,)<span class="op">*</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">m</span>,)<span class="kw-2">*</span>) ; $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>)<span class="op">*</span> }
};
<span class="comment">// Internal macro to Apply a cfg attribute to a list of items</span>
(@<span class="ident">__apply</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">m</span>:<span class="ident">meta</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">it</span>:<span class="ident">item</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">m</span>]</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">it</span>)<span class="op">*</span>
};
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_macros</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">s</span> {
($($(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span> <span class="kw">pub</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ident</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">ident</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">*</span> })<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> ($(
<span class="macro">s</span><span class="macro">!</span>(<span class="ident">it</span>: $(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>]</span>)<span class="op">*</span> <span class="kw">pub</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>)<span class="op">*</span> });
)<span class="kw-2">*</span>);
(<span class="ident">it</span>: $(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span> <span class="kw">pub</span> <span class="ident">union</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">ident</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">*</span> }) <span class="op">=</span><span class="op">></span> (
<span class="macro">compile_error</span><span class="macro">!</span>(<span class="string">"unions cannot derive extra traits, use s_no_extra_traits instead"</span>);
);
(<span class="ident">it</span>: $(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">ident</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">*</span> }) <span class="op">=</span><span class="op">></span> (
<span class="macro">__item</span><span class="macro">!</span> {
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>)]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra_traits"</span>, <span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>, <span class="ident">PartialEq</span>))]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>]</span>)<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>)<span class="op">*</span> }
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">impl</span> ::<span class="ident">Copy</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> {}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">impl</span> ::<span class="ident">Clone</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> { <span class="kw-2">*</span><span class="self">self</span> }
}
);
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_macros</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">s_no_extra_traits</span> {
($($(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span> <span class="kw">pub</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ident</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">ident</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">*</span> })<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> ($(
<span class="macro">s_no_extra_traits</span><span class="macro">!</span>(<span class="ident">it</span>: $(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>]</span>)<span class="op">*</span> <span class="kw">pub</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>)<span class="op">*</span> });
)<span class="kw-2">*</span>);
(<span class="ident">it</span>: $(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span> <span class="kw">pub</span> <span class="ident">union</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">ident</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">*</span> }) <span class="op">=</span><span class="op">></span> (
<span class="macro">cfg_if</span><span class="macro">!</span> {
<span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">libc_union</span>)]</span> {
<span class="macro">__item</span><span class="macro">!</span> {
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>)]</span>
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>]</span>)<span class="op">*</span>
<span class="kw">pub</span> <span class="ident">union</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>)<span class="op">*</span> }
}
<span class="kw">impl</span> ::<span class="ident">Copy</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> {}
<span class="kw">impl</span> ::<span class="ident">Clone</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> { <span class="kw-2">*</span><span class="self">self</span> }
}
}
}
);
(<span class="ident">it</span>: $(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">ident</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">*</span> }) <span class="op">=</span><span class="op">></span> (
<span class="macro">__item</span><span class="macro">!</span> {
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>)]</span>
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>]</span>)<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>)<span class="op">*</span> }
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">impl</span> ::<span class="ident">Copy</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> {}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">impl</span> ::<span class="ident">Clone</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> { <span class="kw-2">*</span><span class="self">self</span> }
}
);
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_macros</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">e</span> {
($($(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span> <span class="kw">pub</span> <span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">ident</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">*</span> })<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> ($(
<span class="macro">__item</span><span class="macro">!</span> {
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra_traits"</span>, <span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>, <span class="ident">PartialEq</span>))]</span>
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>]</span>)<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>)<span class="op">*</span> }
}
<span class="kw">impl</span> ::<span class="ident">Copy</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> {}
<span class="kw">impl</span> ::<span class="ident">Clone</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> { <span class="kw-2">*</span><span class="self">self</span> }
}
)<span class="kw-2">*</span>);
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_macros</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">s_paren</span> {
($($(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">ident</span> ( $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">*</span> ); )<span class="op">*</span> ) <span class="op">=</span><span class="op">></span> ($(
<span class="macro">__item</span><span class="macro">!</span> {
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extra_traits"</span>, <span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>, <span class="ident">PartialEq</span>))]</span>
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>]</span>)<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> ( $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>)<span class="op">*</span> );
}
<span class="kw">impl</span> ::<span class="ident">Copy</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> {}
<span class="kw">impl</span> ::<span class="ident">Clone</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span> { <span class="kw-2">*</span><span class="self">self</span> }
}
)<span class="kw-2">*</span>);
}
<span class="comment">// This is a pretty horrible hack to allow us to conditionally mark</span>
<span class="comment">// some functions as 'const', without requiring users of this macro</span>
<span class="comment">// to care about the "const-extern-fn" feature.</span>
<span class="comment">//</span>
<span class="comment">// When 'const-extern-fn' is enabled, we emit the captured 'const' keyword</span>
<span class="comment">// in the expanded function.</span>
<span class="comment">//</span>
<span class="comment">// When 'const-extern-fn' is disabled, we always emit a plain 'pub unsafe extern fn'.</span>
<span class="comment">// Note that the expression matched by the macro is exactly the same - this allows</span>
<span class="comment">// users of this macro to work whether or not 'const-extern-fn' is enabled</span>
<span class="comment">//</span>
<span class="comment">// Unfortunately, we need to duplicate most of this macro between the 'cfg_if' blocks.</span>
<span class="comment">// This is because 'const unsafe extern fn' won't even parse on older compilers,</span>
<span class="comment">// so we need to avoid emitting it at all of 'const-extern-fn'.</span>
<span class="comment">//</span>
<span class="comment">// Specifically, moving the 'cfg_if' into the macro body will *not* work.</span>
<span class="comment">// Doing so would cause the '#[cfg(feature = "const-extern-fn")]' to be emitted</span>
<span class="comment">// into user code. The 'cfg' gate will not stop Rust from trying to parse the</span>
<span class="comment">// 'pub const unsafe extern fn', so users would get a compiler error even when</span>
<span class="comment">// the 'const-extern-fn' feature is disabled</span>
<span class="comment">//</span>
<span class="comment">// Note that users of this macro need to place 'const' in a weird position</span>
<span class="comment">// (after the closing ')' for the arguments, but before the return type).</span>
<span class="comment">// This was the only way I could satisfy the following two requirements:</span>
<span class="comment">// 1. Avoid ambiguity errors from 'macro_rules!' (which happen when writing '$foo:ident fn'</span>
<span class="comment">// 2. Allow users of this macro to mix 'pub fn foo' and 'pub const fn bar' within the same</span>
<span class="comment">// 'f!' block</span>
<span class="macro">cfg_if</span><span class="macro">!</span> {
<span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">libc_const_extern_fn</span>)]</span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_macros</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">f</span> {
($($(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span> <span class="kw">pub</span> $({<span class="macro-nonterminal">$</span><span class="macro-nonterminal">constness</span>:<span class="ident">ident</span>})<span class="op">*</span> <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">ident</span>(
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">ident</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">argty</span>:<span class="ident">ty</span>),<span class="op">*</span>
) <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span>:<span class="ident">ty</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">body</span>:<span class="ident">stmt</span>);<span class="op">*</span>
})<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> ($(
<span class="attribute">#[<span class="ident">inline</span>]</span>
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>]</span>)<span class="op">*</span>
<span class="kw">pub</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">constness</span>)<span class="op">*</span> <span class="kw">unsafe</span> <span class="kw">extern</span> <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">argty</span>),<span class="op">*</span>
) <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">body</span>);<span class="op">*</span>
}
)<span class="kw-2">*</span>)
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_macros</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">safe_f</span> {
($($(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span> <span class="kw">pub</span> $({<span class="macro-nonterminal">$</span><span class="macro-nonterminal">constness</span>:<span class="ident">ident</span>})<span class="op">*</span> <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">ident</span>(
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">ident</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">argty</span>:<span class="ident">ty</span>),<span class="op">*</span>
) <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span>:<span class="ident">ty</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">body</span>:<span class="ident">stmt</span>);<span class="op">*</span>
})<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> ($(
<span class="attribute">#[<span class="ident">inline</span>]</span>
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>]</span>)<span class="op">*</span>
<span class="kw">pub</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">constness</span>)<span class="op">*</span> <span class="kw">extern</span> <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">argty</span>),<span class="op">*</span>
) <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">body</span>);<span class="op">*</span>
}
)<span class="kw-2">*</span>)
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_macros</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">const_fn</span> {
($($(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span> $({<span class="macro-nonterminal">$</span><span class="macro-nonterminal">constness</span>:<span class="ident">ident</span>})<span class="op">*</span> <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">ident</span>(
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">ident</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">argty</span>:<span class="ident">ty</span>),<span class="op">*</span>
) <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span>:<span class="ident">ty</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">body</span>:<span class="ident">stmt</span>);<span class="op">*</span>
})<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> ($(
<span class="attribute">#[<span class="ident">inline</span>]</span>
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>]</span>)<span class="op">*</span>
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">constness</span>)<span class="op">*</span> <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">argty</span>),<span class="op">*</span>
) <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">body</span>);<span class="op">*</span>
}
)<span class="kw-2">*</span>)
}
} <span class="kw">else</span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_macros</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">f</span> {
($($(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span> <span class="kw">pub</span> $({<span class="macro-nonterminal">$</span><span class="macro-nonterminal">constness</span>:<span class="ident">ident</span>})<span class="op">*</span> <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">ident</span>(
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">ident</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">argty</span>:<span class="ident">ty</span>),<span class="op">*</span>
) <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span>:<span class="ident">ty</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">body</span>:<span class="ident">stmt</span>);<span class="op">*</span>
})<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> ($(
<span class="attribute">#[<span class="ident">inline</span>]</span>
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>]</span>)<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">extern</span> <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">argty</span>),<span class="op">*</span>
) <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">body</span>);<span class="op">*</span>
}
)<span class="kw-2">*</span>)
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_macros</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">safe_f</span> {
($($(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span> <span class="kw">pub</span> $({<span class="macro-nonterminal">$</span><span class="macro-nonterminal">constness</span>:<span class="ident">ident</span>})<span class="op">*</span> <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">ident</span>(
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">ident</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">argty</span>:<span class="ident">ty</span>),<span class="op">*</span>
) <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span>:<span class="ident">ty</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">body</span>:<span class="ident">stmt</span>);<span class="op">*</span>
})<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> ($(
<span class="attribute">#[<span class="ident">inline</span>]</span>
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>]</span>)<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">extern</span> <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">argty</span>),<span class="op">*</span>
) <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">body</span>);<span class="op">*</span>
}
)<span class="kw-2">*</span>)
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_macros</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">const_fn</span> {
($($(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span> $({<span class="macro-nonterminal">$</span><span class="macro-nonterminal">constness</span>:<span class="ident">ident</span>})<span class="op">*</span> <span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">ident</span>(
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">ident</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">argty</span>:<span class="ident">ty</span>),<span class="op">*</span>
) <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span>:<span class="ident">ty</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">body</span>:<span class="ident">stmt</span>);<span class="op">*</span>
})<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> ($(
<span class="attribute">#[<span class="ident">inline</span>]</span>
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>]</span>)<span class="op">*</span>
<span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">argty</span>),<span class="op">*</span>
) <span class="op">-</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">body</span>);<span class="op">*</span>
}
)<span class="kw-2">*</span>)
}
}
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_macros</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">__item</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">item</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>
};
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_macros</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">align_const</span> {
($($(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>:<span class="ident">meta</span>]</span>)<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> : <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t1</span>:<span class="ident">ty</span>
<span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t2</span>:<span class="ident">ident</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span>)<span class="op">*</span> };)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> ($(
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">libc_align</span>)]</span>
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>]</span>)<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> : <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t1</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t2</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>)<span class="op">*</span>
};
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">libc_align</span>))]</span>
$(<span class="attribute">#[<span class="macro-nonterminal">$</span><span class="macro-nonterminal">attr</span>]</span>)<span class="op">*</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span> : <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t1</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t2</span> {
$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>)<span class="op">*</span>
<span class="ident">__align</span>: [],
};
)<span class="kw-2">*</span>)
}
<span class="comment">// This macro is used to deprecate items that should be accessed via the mach crate</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_macros</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">deprecated_mach</span> {
(<span class="kw">pub</span> <span class="kw">const</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">id</span>:<span class="ident">ident</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>:<span class="ident">ty</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>:<span class="ident">expr</span>;) <span class="op">=</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">deprecated</span>(
<span class="ident">since</span> <span class="op">=</span> <span class="string">"0.2.55"</span>,
<span class="ident">note</span> <span class="op">=</span> <span class="string">"Use the `mach` crate instead"</span>,
)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">id</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>;
};
($(<span class="kw">pub</span> <span class="kw">const</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">id</span>:<span class="ident">ident</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>:<span class="ident">ty</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>:<span class="ident">expr</span>;)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {
$(
<span class="macro">deprecated_mach</span><span class="macro">!</span>(
<span class="kw">pub</span> <span class="kw">const</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">id</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>;
);
)<span class="op">*</span>
};
(<span class="kw">pub</span> <span class="kw">type</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">id</span>:<span class="ident">ident</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>:<span class="ident">ty</span>;) <span class="op">=</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">deprecated</span>(
<span class="ident">since</span> <span class="op">=</span> <span class="string">"0.2.55"</span>,
<span class="ident">note</span> <span class="op">=</span> <span class="string">"Use the `mach` crate instead"</span>,
)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">pub</span> <span class="kw">type</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">id</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>;
};
($(<span class="kw">pub</span> <span class="kw">type</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">id</span>:<span class="ident">ident</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>:<span class="ident">ty</span>;)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {
$(
<span class="macro">deprecated_mach</span><span class="macro">!</span>(
<span class="kw">pub</span> <span class="kw">type</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">id</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>;
);
)<span class="op">*</span>
}
}
</pre></div>
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