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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 trait for visiting an abstract syntax tree (AST) in depth first order."><title>Visitor in regex_syntax::ast - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.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"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="regex_syntax" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.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]--><rustdoc-topbar><h2><a href="#">Visitor</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../regex_syntax/index.html">regex_<wbr>syntax</a><span class="version">0.8.10</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Visitor</a></h2><h3><a href="#required-associated-types">Required Associated Types</a></h3><ul class="block"><li><a href="#associatedtype.Err" title="Err">Err</a></li><li><a href="#associatedtype.Output" title="Output">Output</a></li></ul><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.finish" title="finish">finish</a></li></ul><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.start" title="start">start</a></li><li><a href="#method.visit_alternation_in" title="visit_alternation_in">visit_alternation_in</a></li><li><a href="#method.visit_class_set_binary_op_in" title="visit_class_set_binary_op_in">visit_class_set_binary_op_in</a></li><li><a href="#method.visit_class_set_binary_op_post" title="visit_class_set_binary_op_post">visit_class_set_binary_op_post</a></li><li><a href="#method.visit_class_set_binary_op_pre" title="visit_class_set_binary_op_pre">visit_class_set_binary_op_pre</a></li><li><a href="#method.visit_class_set_item_post" title="visit_class_set_item_post">visit_class_set_item_post</a></li><li><a href="#method.visit_class_set_item_pre" title="visit_class_set_item_pre">visit_class_set_item_pre</a></li><li><a href="#method.visit_concat_in" title="visit_concat_in">visit_concat_in</a></li><li><a href="#method.visit_post" title="visit_post">visit_post</a></li><li><a href="#method.visit_pre" title="visit_pre">visit_pre</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In regex_<wbr>syntax::<wbr>ast</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../index.html">regex_syntax</a>::<wbr><a href="index.html">ast</a></div><h1>Trait <span class="trait">Visitor</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/regex_syntax/ast/visitor.rs.html#20-102">Source</a> </span></div><pre class="rust item-decl"><code>pub trait Visitor {
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type <a href="#associatedtype.Output" class="associatedtype">Output</a>;
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type <a href="#associatedtype.Err" class="associatedtype">Err</a>;
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// Required method
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fn <a href="#tymethod.finish" class="fn">finish</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Output" title="type regex_syntax::ast::Visitor::Output">Output</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>>;
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// Provided methods
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fn <a href="#method.start" class="fn">start</a>(&mut self) { ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_pre" class="fn">visit_pre</a>(&mut self, _ast: &<a class="enum" href="enum.Ast.html" title="enum regex_syntax::ast::Ast">Ast</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_post" class="fn">visit_post</a>(&mut self, _ast: &<a class="enum" href="enum.Ast.html" title="enum regex_syntax::ast::Ast">Ast</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_alternation_in" class="fn">visit_alternation_in</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_concat_in" class="fn">visit_concat_in</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_class_set_item_pre" class="fn">visit_class_set_item_pre</a>(
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&mut self,
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_ast: &<a class="enum" href="enum.ClassSetItem.html" title="enum regex_syntax::ast::ClassSetItem">ClassSetItem</a>,
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) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_class_set_item_post" class="fn">visit_class_set_item_post</a>(
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&mut self,
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_ast: &<a class="enum" href="enum.ClassSetItem.html" title="enum regex_syntax::ast::ClassSetItem">ClassSetItem</a>,
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) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_class_set_binary_op_pre" class="fn">visit_class_set_binary_op_pre</a>(
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&mut self,
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_ast: &<a class="struct" href="struct.ClassSetBinaryOp.html" title="struct regex_syntax::ast::ClassSetBinaryOp">ClassSetBinaryOp</a>,
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) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_class_set_binary_op_post" class="fn">visit_class_set_binary_op_post</a>(
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&mut self,
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_ast: &<a class="struct" href="struct.ClassSetBinaryOp.html" title="struct regex_syntax::ast::ClassSetBinaryOp">ClassSetBinaryOp</a>,
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) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_class_set_binary_op_in" class="fn">visit_class_set_binary_op_in</a>(
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&mut self,
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_ast: &<a class="struct" href="struct.ClassSetBinaryOp.html" title="struct regex_syntax::ast::ClassSetBinaryOp">ClassSetBinaryOp</a>,
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) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>> { ... }
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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 trait for visiting an abstract syntax tree (AST) in depth first order.</p>
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<p>The principle aim of this trait is to enable callers to perform case
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analysis on an abstract syntax tree without necessarily using recursion.
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In particular, this permits callers to do case analysis with constant stack
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usage, which can be important since the size of an abstract syntax tree
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may be proportional to end user input.</p>
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<p>Typical usage of this trait involves providing an implementation and then
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running it using the <a href="fn.visit.html" title="fn regex_syntax::ast::visit"><code>visit</code></a> function.</p>
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<p>Note that the abstract syntax tree for a regular expression is quite
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complex. Unless you specifically need it, you might be able to use the much
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simpler <a href="../hir/struct.Hir.html" title="struct regex_syntax::hir::Hir">high-level intermediate representation</a> and its
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<a href="../hir/trait.Visitor.html" title="trait regex_syntax::hir::Visitor">corresponding <code>Visitor</code> trait</a> instead.</p>
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</div></details><h2 id="required-associated-types" class="section-header">Required Associated Types<a href="#required-associated-types" class="anchor">§</a></h2><div class="methods"><details class="toggle" open><summary><section id="associatedtype.Output" class="method"><a class="src rightside" href="../../src/regex_syntax/ast/visitor.rs.html#22">Source</a><h4 class="code-header">type <a href="#associatedtype.Output" class="associatedtype">Output</a></h4></section></summary><div class="docblock"><p>The result of visiting an AST.</p>
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</div></details><details class="toggle" open><summary><section id="associatedtype.Err" class="method"><a class="src rightside" href="../../src/regex_syntax/ast/visitor.rs.html#24">Source</a><h4 class="code-header">type <a href="#associatedtype.Err" class="associatedtype">Err</a></h4></section></summary><div class="docblock"><p>An error that visiting an AST might return.</p>
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</div></details></div><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.finish" class="method"><a class="src rightside" href="../../src/regex_syntax/ast/visitor.rs.html#28">Source</a><h4 class="code-header">fn <a href="#tymethod.finish" class="fn">finish</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Output" title="type regex_syntax::ast::Visitor::Output">Output</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></h4></section></summary><div class="docblock"><p>All implementors of <code>Visitor</code> must provide a <code>finish</code> method, which
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yields the result of visiting the AST or an error.</p>
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</div></details></div><h2 id="provided-methods" class="section-header">Provided Methods<a href="#provided-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="method.start" class="method"><a class="src rightside" href="../../src/regex_syntax/ast/visitor.rs.html#31">Source</a><h4 class="code-header">fn <a href="#method.start" class="fn">start</a>(&mut self)</h4></section></summary><div class="docblock"><p>This method is called before beginning traversal of the AST.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.visit_pre" class="method"><a class="src rightside" href="../../src/regex_syntax/ast/visitor.rs.html#35-37">Source</a><h4 class="code-header">fn <a href="#method.visit_pre" class="fn">visit_pre</a>(&mut self, _ast: &<a class="enum" href="enum.Ast.html" title="enum regex_syntax::ast::Ast">Ast</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></h4></section></summary><div class="docblock"><p>This method is called on an <code>Ast</code> before descending into child <code>Ast</code>
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nodes.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.visit_post" class="method"><a class="src rightside" href="../../src/regex_syntax/ast/visitor.rs.html#41-43">Source</a><h4 class="code-header">fn <a href="#method.visit_post" class="fn">visit_post</a>(&mut self, _ast: &<a class="enum" href="enum.Ast.html" title="enum regex_syntax::ast::Ast">Ast</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></h4></section></summary><div class="docblock"><p>This method is called on an <code>Ast</code> after descending all of its child
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<code>Ast</code> nodes.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.visit_alternation_in" class="method"><a class="src rightside" href="../../src/regex_syntax/ast/visitor.rs.html#47-49">Source</a><h4 class="code-header">fn <a href="#method.visit_alternation_in" class="fn">visit_alternation_in</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></h4></section></summary><div class="docblock"><p>This method is called between child nodes of an
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<a href="struct.Alternation.html" title="struct regex_syntax::ast::Alternation"><code>Alternation</code></a>.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.visit_concat_in" class="method"><a class="src rightside" href="../../src/regex_syntax/ast/visitor.rs.html#52-54">Source</a><h4 class="code-header">fn <a href="#method.visit_concat_in" class="fn">visit_concat_in</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></h4></section></summary><div class="docblock"><p>This method is called between child nodes of a concatenation.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.visit_class_set_item_pre" class="method"><a class="src rightside" href="../../src/regex_syntax/ast/visitor.rs.html#58-63">Source</a><h4 class="code-header">fn <a href="#method.visit_class_set_item_pre" class="fn">visit_class_set_item_pre</a>(
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&mut self,
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_ast: &<a class="enum" href="enum.ClassSetItem.html" title="enum regex_syntax::ast::ClassSetItem">ClassSetItem</a>,
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) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></h4></section></summary><div class="docblock"><p>This method is called on every <a href="enum.ClassSetItem.html" title="enum regex_syntax::ast::ClassSetItem"><code>ClassSetItem</code></a>
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before descending into child nodes.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.visit_class_set_item_post" class="method"><a class="src rightside" href="../../src/regex_syntax/ast/visitor.rs.html#67-72">Source</a><h4 class="code-header">fn <a href="#method.visit_class_set_item_post" class="fn">visit_class_set_item_post</a>(
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&mut self,
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_ast: &<a class="enum" href="enum.ClassSetItem.html" title="enum regex_syntax::ast::ClassSetItem">ClassSetItem</a>,
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) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></h4></section></summary><div class="docblock"><p>This method is called on every <a href="enum.ClassSetItem.html" title="enum regex_syntax::ast::ClassSetItem"><code>ClassSetItem</code></a>
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after descending into child nodes.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.visit_class_set_binary_op_pre" class="method"><a class="src rightside" href="../../src/regex_syntax/ast/visitor.rs.html#77-82">Source</a><h4 class="code-header">fn <a href="#method.visit_class_set_binary_op_pre" class="fn">visit_class_set_binary_op_pre</a>(
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&mut self,
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_ast: &<a class="struct" href="struct.ClassSetBinaryOp.html" title="struct regex_syntax::ast::ClassSetBinaryOp">ClassSetBinaryOp</a>,
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) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></h4></section></summary><div class="docblock"><p>This method is called on every
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<a href="struct.ClassSetBinaryOp.html" title="struct regex_syntax::ast::ClassSetBinaryOp"><code>ClassSetBinaryOp</code></a> before descending into
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child nodes.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.visit_class_set_binary_op_post" class="method"><a class="src rightside" href="../../src/regex_syntax/ast/visitor.rs.html#87-92">Source</a><h4 class="code-header">fn <a href="#method.visit_class_set_binary_op_post" class="fn">visit_class_set_binary_op_post</a>(
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&mut self,
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_ast: &<a class="struct" href="struct.ClassSetBinaryOp.html" title="struct regex_syntax::ast::ClassSetBinaryOp">ClassSetBinaryOp</a>,
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) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></h4></section></summary><div class="docblock"><p>This method is called on every
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<a href="struct.ClassSetBinaryOp.html" title="struct regex_syntax::ast::ClassSetBinaryOp"><code>ClassSetBinaryOp</code></a> after descending into child
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nodes.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.visit_class_set_binary_op_in" class="method"><a class="src rightside" href="../../src/regex_syntax/ast/visitor.rs.html#96-101">Source</a><h4 class="code-header">fn <a href="#method.visit_class_set_binary_op_in" class="fn">visit_class_set_binary_op_in</a>(
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&mut self,
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_ast: &<a class="struct" href="struct.ClassSetBinaryOp.html" title="struct regex_syntax::ast::ClassSetBinaryOp">ClassSetBinaryOp</a>,
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) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Err" title="type regex_syntax::ast::Visitor::Err">Err</a>></h4></section></summary><div class="docblock"><p>This method is called between the left hand and right hand child nodes
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of a <a href="struct.ClassSetBinaryOp.html" title="struct regex_syntax::ast::ClassSetBinaryOp"><code>ClassSetBinaryOp</code></a>.</p>
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