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<br>
<table><tr><td><hr>
<b>Note:</b><i>As of Rust 1.45 this crate is superseded by native support
for #[proc_macro] in expression position. Only consider using this crate if
you care about supporting compilers between 1.31 and 1.45.</i>
<hr></td></tr></table>
<p>Since Rust 1.30, the language supports user-defined function-like procedural
macros. However these can only be invoked in item position, not in
statements or expressions.</p>
<p>This crate implements an alternative type of procedural macro that can be
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