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<spanclass='in-band'>List of all items</span></h1><h3id='Attribute Macros'>Attribute Macros</h3><ulclass='attributes docblock'><li><ahref='attr.proc_macro_hack.html'>proc_macro_hack</a></li></ul></section><sectionid="search"class="content hidden"></section><sectionclass="footer"></section><script>window.rootPath="../";window.currentCrate="proc_macro_hack";</script><scriptsrc="../aliases.js"></script><scriptsrc="../main.js"></script><scriptdefersrc="../search-index.js"></script></body></html>
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<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="API documentation for the Rust `proc_macro_hack` crate."><metaname="keywords"content="rust, rustlang, rust-lang, proc_macro_hack"><title>proc_macro_hack - Rust</title><linkrel="stylesheet"type="text/css"href="../normalize.css"><linkrel="stylesheet"type="text/css"href="../rustdoc.css"id="mainThemeStyle"><linkrel="stylesheet"type="text/css"href="../dark.css"><linkrel="stylesheet"type="text/css"href="../light.css"id="themeStyle"><scriptsrc="../storage.js"></script><noscript><linkrel="stylesheet"href="../noscript.css"></noscript><linkrel="shortcut icon"href="../favicon.ico"><styletype="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><bodyclass="rustdoc mod"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="sidebar"><divclass="sidebar-menu">☰</div><ahref='../proc_macro_hack/index.html'><divclass='logo-container'><imgsrc='../rust-logo.png'alt='logo'></div></a><pclass='location'>Crate proc_macro_hack</p><divclass="sidebar-elems"><aid='all-types'href='all.html'><p>See all proc_macro_hack's items</p></a><pclass='location'></p><script>window.sidebarCurrent={name:'proc_macro_hack',ty:'mod',relpath:'../'};</script></div></nav><divclass="theme-picker"><buttonid="theme-picker"aria-label="Pick another theme!"><imgsrc="../brush.svg"width="18"alt="Pick another theme!"></button><divid="theme-choices"></div></div><scriptsrc="../theme.js"></script><navclass="sub"><formclass="search-form"><divclass="search-container"><div><selectid="crate-search"><optionvalue="All crates">All crates</option></select><inputclass="search-input"name="search"disabledautocomplete="off"spellcheck="false"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"></div><aid="settings-menu"href="../settings.html"><imgsrc="../wheel.svg"width="18"alt="Change settings"></a></div></form></nav><sectionid="main"class="content"><h1class='fqn'><spanclass='out-of-band'><spanid='render-detail'><aid="toggle-all-docs"href="javascript:void(0)"title="collapse all docs">[<spanclass='inner'>−</span>]</a></span><aclass='srclink'href='../src/proc_macro_hack/lib.rs.html#1-498'title='goto source code'>[src]</a></span><spanclass='in-band'>Crate <aclass="mod"href=''>proc_macro_hack</a></span></h1><divclass='docblock'><p>As of 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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