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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="A collection of methods that do not exist in `proc_macro::Diagnostic` but still useful to have around."><title>DiagnosticExt in proc_macro_error2 - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="proc_macro_error2" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.0 (9fc6b4312 2025-01-07)" data-channel="1.84.0" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../static.files/storage-59e33391.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.svg"></head><body class="rustdoc trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../proc_macro_error2/index.html">proc_<wbr>macro_<wbr>error2</a><span class="version">2.0.1</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Diagnostic<wbr>Ext</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.span_range_error" title="span_range_error">span_range_error</a></li><li><a href="#tymethod.span_range_help" title="span_range_help">span_range_help</a></li><li><a href="#tymethod.span_range_note" title="span_range_note">span_range_note</a></li><li><a href="#tymethod.spanned_range" title="spanned_range">spanned_range</a></li></ul><h3><a href="#dyn-compatibility">Dyn Compatibility</a></h3><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate proc_<wbr>macro_<wbr>error2</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="index.html">proc_macro_error2</a></span><h1>Trait <span class="trait">DiagnosticExt</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/proc_macro_error2/diagnostic.rs.html#34-70">Source</a> </span></div><pre class="rust item-decl"><code>pub trait DiagnosticExt: Sealed {
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// Required methods
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fn <a href="#tymethod.spanned_range" class="fn">spanned_range</a>(
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span_range: <a class="struct" href="struct.SpanRange.html" title="struct proc_macro_error2::SpanRange">SpanRange</a>,
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level: <a class="enum" href="enum.Level.html" title="enum proc_macro_error2::Level">Level</a>,
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message: <a class="struct" href="https://doc.rust-lang.org/1.84.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>,
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) -> Self;
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<span class="item-spacer"></span> fn <a href="#tymethod.span_range_error" class="fn">span_range_error</a>(self, span_range: <a class="struct" href="struct.SpanRange.html" title="struct proc_macro_error2::SpanRange">SpanRange</a>, msg: <a class="struct" href="https://doc.rust-lang.org/1.84.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>) -> Self;
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<span class="item-spacer"></span> fn <a href="#tymethod.span_range_help" class="fn">span_range_help</a>(self, span_range: <a class="struct" href="struct.SpanRange.html" title="struct proc_macro_error2::SpanRange">SpanRange</a>, msg: <a class="struct" href="https://doc.rust-lang.org/1.84.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>) -> Self;
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<span class="item-spacer"></span> fn <a href="#tymethod.span_range_note" class="fn">span_range_note</a>(self, span_range: <a class="struct" href="struct.SpanRange.html" title="struct proc_macro_error2::SpanRange">SpanRange</a>, msg: <a class="struct" href="https://doc.rust-lang.org/1.84.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>) -> Self;
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A collection of methods that do not exist in <code>proc_macro::Diagnostic</code>
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but still useful to have around.</p>
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<p>This trait is sealed and cannot be implemented outside of <code>proc_macro_error</code>.</p>
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</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.spanned_range" class="method"><a class="src rightside" href="../src/proc_macro_error2/diagnostic.rs.html#39">Source</a><h4 class="code-header">fn <a href="#tymethod.spanned_range" class="fn">spanned_range</a>(span_range: <a class="struct" href="struct.SpanRange.html" title="struct proc_macro_error2::SpanRange">SpanRange</a>, level: <a class="enum" href="enum.Level.html" title="enum proc_macro_error2::Level">Level</a>, message: <a class="struct" href="https://doc.rust-lang.org/1.84.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>) -> Self</h4></section></summary><div class="docblock"><p>Create a new diagnostic message that points to the <code>span_range</code>.</p>
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<p>This function is the same as <code>Diagnostic::spanned</code> but produces considerably
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better error messages for multi-token spans on stable.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.span_range_error" class="method"><a class="src rightside" href="../src/proc_macro_error2/diagnostic.rs.html#47">Source</a><h4 class="code-header">fn <a href="#tymethod.span_range_error" class="fn">span_range_error</a>(self, span_range: <a class="struct" href="struct.SpanRange.html" title="struct proc_macro_error2::SpanRange">SpanRange</a>, msg: <a class="struct" href="https://doc.rust-lang.org/1.84.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>) -> Self</h4></section></summary><div class="docblock"><p>Add another error message to self such that it will be emitted right after
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the main message.</p>
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<p>This function is the same as <code>Diagnostic::span_error</code> but produces considerably
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better error messages for multi-token spans on stable.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.span_range_help" class="method"><a class="src rightside" href="../src/proc_macro_error2/diagnostic.rs.html#58">Source</a><h4 class="code-header">fn <a href="#tymethod.span_range_help" class="fn">span_range_help</a>(self, span_range: <a class="struct" href="struct.SpanRange.html" title="struct proc_macro_error2::SpanRange">SpanRange</a>, msg: <a class="struct" href="https://doc.rust-lang.org/1.84.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>) -> Self</h4></section></summary><div class="docblock"><p>Attach a “help” note to your main message, the note will have it’s own span on nightly.</p>
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<p>This function is the same as <code>Diagnostic::span_help</code> but produces considerably
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better error messages for multi-token spans on stable.</p>
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<h5 id="span"><a class="doc-anchor" href="#span">§</a>Span</h5>
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<p>The span is ignored on stable, the note effectively inherits its parent’s (main message) span</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.span_range_note" class="method"><a class="src rightside" href="../src/proc_macro_error2/diagnostic.rs.html#69">Source</a><h4 class="code-header">fn <a href="#tymethod.span_range_note" class="fn">span_range_note</a>(self, span_range: <a class="struct" href="struct.SpanRange.html" title="struct proc_macro_error2::SpanRange">SpanRange</a>, msg: <a class="struct" href="https://doc.rust-lang.org/1.84.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>) -> Self</h4></section></summary><div class="docblock"><p>Attach a note to your main message, the note will have it’s own span on nightly.</p>
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<p>This function is the same as <code>Diagnostic::span_note</code> but produces considerably
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better error messages for multi-token spans on stable.</p>
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<h5 id="span-1"><a class="doc-anchor" href="#span-1">§</a>Span</h5>
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<p>The span is ignored on stable, the note effectively inherits its parent’s (main message) span</p>
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</div></details></div><h2 id="dyn-compatibility" class="section-header">Dyn Compatibility<a href="#dyn-compatibility" class="anchor">§</a></h2><div class="dyn-compatibility-info"><p>This trait is <b>not</b> <a href="https://doc.rust-lang.org/1.84.0/reference/items/traits.html#object-safety">dyn compatible</a>.</p><p><i>In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.</i></p></div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-DiagnosticExt-for-Diagnostic" class="impl"><a class="src rightside" href="../src/proc_macro_error2/diagnostic.rs.html#72-99">Source</a><a href="#impl-DiagnosticExt-for-Diagnostic" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.DiagnosticExt.html" title="trait proc_macro_error2::DiagnosticExt">DiagnosticExt</a> for <a class="struct" href="struct.Diagnostic.html" title="struct proc_macro_error2::Diagnostic">Diagnostic</a></h3></section></div><script src="../trait.impl/proc_macro_error2/diagnostic/trait.DiagnosticExt.js" async></script></section></div></main></body></html>
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