diff --git a/assets/ecmarkup.css b/assets/ecmarkup.css
index 22af857..4523c14 100644
--- a/assets/ecmarkup.css
+++ b/assets/ecmarkup.css
@@ -125,6 +125,7 @@ body.oldtoc {
 
 span[aria-hidden='true'] {
   font-size: 0;
+  white-space: pre;
 }
 
 a {
@@ -222,6 +223,10 @@ var.field {
   font: inherit;
   color: inherit;
 }
+/* suppress line break opportunities between `.` and `[[FieldName]]` */
+var.field::before {
+  content: '\2060'
+}
 
 var.referenced {
   color: inherit;
diff --git a/assets/ecmarkup.js b/assets/ecmarkup.js
index 0aabe6a..faa6c75 100644
--- a/assets/ecmarkup.js
+++ b/assets/ecmarkup.js
@@ -656,6 +656,7 @@ Menu.prototype.togglePinEntry = function (id) {
 };
 
 Menu.prototype.selectPin = function (num) {
+  if (num >= this.$pinList.children.length) return;
   document.location = this.$pinList.children[num].children[0].href;
 };
 
@@ -1437,6 +1438,7 @@ const counterByDepth = [];
 function addStepNumberText(
   ol,
   depth = 0,
+  indent = '',
   special = [...ol.classList].some(c => c.startsWith('nested-')),
 ) {
   let counter = !special && counterByDepth[depth];
@@ -1460,8 +1462,11 @@ function addStepNumberText(
   let i = (Number(ol.getAttribute('start')) || 1) - 1;
   for (const li of ol.children) {
     const marker = document.createElement('span');
-    marker.textContent = `${i < cache.length ? cache[i] : getTextForIndex(i)}. `;
+    const markerText = i < cache.length ? cache[i] : getTextForIndex(i);
+    const extraIndent = ' '.repeat(markerText.length + 2);
+    marker.textContent = `${indent}${markerText}. `;
     marker.setAttribute('aria-hidden', 'true');
+    marker.setAttribute('class', 'list-marker');
     const attributesContainer = li.querySelector('.attributes-tag');
     if (attributesContainer == null) {
       li.prepend(marker);
@@ -1469,7 +1474,7 @@ function addStepNumberText(
       attributesContainer.insertAdjacentElement('afterend', marker);
     }
     for (const sublist of li.querySelectorAll(':scope > ol')) {
-      addStepNumberText(sublist, depth + 1, special);
+      addStepNumberText(sublist, depth + 1, indent + extraIndent, special);
     }
     i++;
   }
@@ -1481,6 +1486,52 @@ document.addEventListener('DOMContentLoaded', () => {
   });
 });
 
+// Omit indendation when copying a single algorithm step.
+document.addEventListener('copy', evt => {
+  // Construct a DOM from the selection.
+  const doc = document.implementation.createHTMLDocument('');
+  const domRoot = doc.createElement('div');
+  const html = evt.clipboardData.getData('text/html');
+  if (html) {
+    domRoot.innerHTML = html;
+  } else {
+    const selection = getSelection();
+    const singleRange = selection?.rangeCount === 1 && selection.getRangeAt(0);
+    const container = singleRange?.commonAncestorContainer;
+    if (!container?.querySelector?.('.list-marker')) {
+      return;
+    }
+    domRoot.append(singleRange.cloneContents());
+  }
+
+  // Preserve the indentation if there is no hidden list marker, or if selection
+  // of more than one step is indicated by either multiple such markers or by
+  // visible text before the first one.
+  const listMarkers = domRoot.querySelectorAll('.list-marker');
+  if (listMarkers.length !== 1) {
+    return;
+  }
+  const treeWalker = document.createTreeWalker(domRoot, undefined, {
+    acceptNode(node) {
+      return node.nodeType === Node.TEXT_NODE || node === listMarkers[0]
+        ? NodeFilter.FILTER_ACCEPT
+        : NodeFilter.FILTER_SKIP;
+    },
+  });
+  while (treeWalker.nextNode()) {
+    const node = treeWalker.currentNode;
+    if (node.nodeType === Node.ELEMENT_NODE) break;
+    if (/\S/u.test(node.data)) return;
+  }
+
+  // Strip leading indentation from the plain text representation.
+  evt.clipboardData.setData('text/plain', domRoot.textContent.trimStart());
+  if (!html) {
+    evt.clipboardData.setData('text/html', domRoot.innerHTML);
+  }
+  evt.preventDefault();
+});
+
 'use strict';
 
 // Update superscripts to not suffer misinterpretation when copied and pasted as plain text.
@@ -1554,5 +1605,5 @@ document.addEventListener('DOMContentLoaded', () => {
 });
 
 let sdoMap = 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-let biblio = 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Syntax","number":"B.1"},{"type":"clause","id":"sec-regexp.prototype.compile","title":"RegExp.prototype.compile ( pattern, flags )","titleHTML":"RegExp.prototype.compile ( <var>pattern</var>, <var>flags</var> )","number":"B.2.4.1"},{"type":"clause","id":"sec-additional-properties-of-the-regexp.prototype-object","titleHTML":"Additional Properties of the RegExp.prototype Object","number":"B.2.4"},{"type":"clause","id":"sec-additional-built-in-properties","titleHTML":"Additional Built-in Properties","number":"B.2"},{"type":"clause","id":"sec-additional-ecmascript-features-for-web-browsers","titleHTML":"Additional ECMAScript Features for Web Browsers","number":"B"},{"type":"clause","id":"sec-copyright-and-software-license","title":"Copyright & Software License","titleHTML":"Copyright &amp; Software License","number":"C"}]}`);
 ;let usesMultipage = false
\ No newline at end of file
diff --git a/assets/print.css b/assets/print.css
index a5e7eaf..0670909 100644
--- a/assets/print.css
+++ b/assets/print.css
@@ -1,5 +1,5 @@
 body {
-  font-family: Arial;
+  font-family: Arial, Helvetica, sans-serif;
   font-size: 10pt;
   background: #fff;
   color: #000;
@@ -50,6 +50,11 @@ emu-figure img {
   max-width: none;
 }
 
+#toc a,
+#toc var {
+  color: #000;
+}
+
 #toc a[href] {
   background: #fff;
   padding-right: 0.5em;
@@ -78,6 +83,10 @@ emu-figure img {
   display: none;
 }
 
+#toc > ol > li {
+  margin-top: 1ex;
+}
+
 #toc,
 #spec-container > emu-intro,
 #spec-container > emu-annex {
@@ -102,7 +111,8 @@ emu-table th,
 emu-table td,
 emu-alg li,
 pre,
-h1 {
+h1,
+#metadata-block {
   break-inside: avoid;
 }
 
diff --git a/index.html b/index.html
index bacd69e..13789cb 100644
--- a/index.html
+++ b/index.html
@@ -1,6 +1,24 @@
 <!doctype html>
-<head><meta charset="utf-8">
-<title>Pattern Matching</title><script src="assets/ecmarkup.js?cache=wnO3WAQr" defer=""></script><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.0.1/styles/base16/solarized-light.min.css"><link rel="stylesheet" href="assets/ecmarkup.css"><link rel="stylesheet" href="assets/print.css" media="print"><style>
+<head><meta charset="utf-8"><meta property="og:image" content="https://tc39.es/ecmarkup/ecma-logo.png"><meta property="og:title" content="Pattern Matching"><meta property="og:description" content="Welcome
+
+  
+    TODOs
+    
+      
+        Scope and bindings
+        
+          Basic case.
+          Work with `for` loop (CreatePerIterationEnvironment).
+          Work with function parameters.
+        
+      
+    
+  
+
+  
+      Introduction
+      This specification consists of the following pa">
+<title>Pattern Matching</title><script src="assets/ecmarkup.js?cache=oOAFvCzX" defer=""></script><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.0.1/styles/base16/solarized-light.min.css"><link rel="stylesheet" href="assets/ecmarkup.css"><link rel="stylesheet" href="assets/print.css" media="print"><style>
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@@ -40,7 +58,7 @@
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class="toc"><li><span class="item-toggle-none"></span><a href="#sec-organization-of-this-specification" title="Organization of This Specification"><span class="secnum">4.5</span> Organization of This Specification</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-data-types-and-values" title="ECMAScript Data Types and Values"><span class="secnum">6</span> ECMAScript Data Types and Values</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-types" title="ECMAScript Language Types"><span class="secnum">6.1</span> ECMAScript Language Types</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-types-symbol-type" title="The Symbol Type"><span class="secnum">6.1.5</span> The Symbol Type</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-well-known-symbols" title="Well-Known Symbols"><span class="secnum">6.1.5.1</span> Well-Known Symbols</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-object-internal-methods-and-internal-slots" title="Object Internal Methods and Internal Slots"><span class="secnum">6.1.7</span> Object Internal Methods and Internal Slots</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-abstract-operations" title="Abstract Operations"><span class="secnum">7</span> Abstract Operations</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-operations-on-objects" title="Operations on Objects"><span class="secnum">7.3</span> Operations on Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-initializeinstance" title="InitializeInstanceElements ( O, constructor )"><span class="secnum">7.3.34</span> InitializeInstanceElements ( <var>O</var>, <var>constructor</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-syntax-directed-operations" title="Syntax-Directed Operations"><span class="secnum">8</span> Syntax-Directed Operations</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-syntax-directed-operations-scope-analysis" title="Scope Analysis"><span class="secnum">8.2</span> Scope Analysis</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-boundnames" title="Static Semantics: BoundNames"><span class="secnum">8.2.1</span> SS: BoundNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-declarationpart" title="Static Semantics: DeclarationPart"><span class="secnum">8.2.2</span> SS: DeclarationPart</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-isconstantdeclaration" title="Static Semantics: IsConstantDeclaration"><span class="secnum">8.2.3</span> SS: IsConstantDeclaration</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-lexicallydeclarednames" title="Static Semantics: LexicallyDeclaredNames"><span class="secnum">8.2.4</span> SS: LexicallyDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-lexicallyscopeddeclarations" title="Static Semantics: LexicallyScopedDeclarations"><span class="secnum">8.2.5</span> SS: LexicallyScopedDeclarations</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-vardeclarednames" title="Static Semantics: VarDeclaredNames"><span class="secnum">8.2.6</span> SS: VarDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-varscopeddeclarations" title="Static Semantics: VarScopedDeclarations"><span class="secnum">8.2.7</span> SS: VarScopedDeclarations</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-toplevellexicallydeclarednames" title="Static Semantics: TopLevelLexicallyDeclaredNames"><span class="secnum">8.2.8</span> SS: TopLevelLexicallyDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-toplevellexicallyscopeddeclarations" title="Static Semantics: TopLevelLexicallyScopedDeclarations"><span class="secnum">8.2.9</span> SS: TopLevelLexicallyScopedDeclarations</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-toplevelvardeclarednames" title="Static Semantics: TopLevelVarDeclaredNames"><span class="secnum">8.2.10</span> SS: TopLevelVarDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-toplevelvarscopeddeclarations" title="Static Semantics: TopLevelVarScopedDeclarations"><span class="secnum">8.2.11</span> SS: TopLevelVarScopedDeclarations</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-syntax-directed-operations-miscellaneous" title="Miscellaneous"><span class="secnum">8.6</span> Miscellaneous</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-runtime-semantics-bindinginitialization" title="Runtime Semantics: BindingInitialization"><span class="secnum">8.6.2</span> RS: BindingInitialization</a></li><li><span class="item-toggle-none"></span><a href="#sec-runtime-semantics-iteratorbindinginitialization" title="Runtime Semantics: IteratorBindingInitialization"><span class="secnum">8.6.3</span> RS: IteratorBindingInitialization</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-executable-code-and-execution-contexts" title="Executable Code and Execution Contexts"><span class="secnum">9</span> Executable Code and Execution Contexts</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-weakly-hold-targets-processing-model" title="Processing Model of WeakRef and FinalizationRegistryweakly hold Targets"><span class="secnum">9.10</span> Processing Model of <del>WeakRef and FinalizationRegistry</del><ins>weakly hold</ins> Targets</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-weakly-hold-execution" title="Execution"><span class="secnum">9.10.3</span> Execution</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-lexical-grammar" title="ECMAScript Language: Lexical Grammar"><span class="secnum">12</span> ECMAScript Language: Lexical Grammar</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-automatic-semicolon-insertion" title="Automatic Semicolon Insertion"><span class="secnum">12.10</span> Automatic Semicolon Insertion</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-rules-of-automatic-semicolon-insertion" title="Rules of Automatic Semicolon Insertion"><span class="secnum">12.10.1</span> Rules of Automatic Semicolon Insertion</a></li><li><span class="item-toggle">+</span><a href="#sec-interesting-cases-of-automatic-semicolon-insertion" title="Interesting Cases of Automatic Semicolon Insertion"><span class="secnum">12.10.3</span> Interesting Cases of Automatic Semicolon Insertion</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-asi-cases-with-no-lineterminator-here" title="Cases of Automatic Semicolon Insertion and “[no LineTerminator here]”"><span class="secnum">12.10.3.2</span> Cases of Automatic Semicolon Insertion and “[no <emu-nt>LineTerminator</emu-nt> here]”</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-no-lineterminator-here-automatic-semicolon-insertion-list" title="List of Grammar Productions with Optional Operands and “[no LineTerminator here]”"><span class="secnum">12.10.3.2.1</span> List of Grammar Productions with Optional Operands and “[no <emu-nt>LineTerminator</emu-nt> here]”</a></li></ol></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-expressions" title="ECMAScript Language: Expressions"><span class="secnum">13</span> ECMAScript Language: Expressions</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-primary-expression" title="Primary Expression"><span class="secnum">13.2</span> Primary Expression</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-primary-expression-regular-expression-literals" title="Regular Expression Literals"><span class="secnum">13.2.7</span> Regular Expression Literals</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-primary-expression-regular-expression-literals-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">13.2.7.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="#sec-isvalidregularexpressionliteral" title="Static Semantics: IsValidRegularExpressionLiteral ( literal, canCreateBinding )"><span class="secnum">13.2.7.2</span> SS: IsValidRegularExpressionLiteral ( <var>literal</var>, <ins><var>canCreateBinding</var></ins> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-primary-expression-match-expression" title="Match Expression"><span class="secnum">13.2.10</span> Match Expression</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-relational-operators" title="Relational Operators"><span class="secnum">13.10</span> Relational Operators</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-relational-operators-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.10.1</span> RS: Evaluation</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-statements-and-declarations" title="ECMAScript Language: Statements and Declarations"><span class="secnum">14</span> ECMAScript Language: Statements and Declarations</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-iteration-statements" title="Iteration Statements"><span class="secnum">14.7</span> Iteration Statements</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-for-in-and-for-of-statements" title="The for-in, for-of, and for-await-of Statements"><span class="secnum">14.7.1</span> The <code>for</code>-<code>in</code>, <code>for</code>-<code>of</code>, and <code>for</code>-<code>await</code>-<code>of</code> Statements</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-try-statement" title="The try Statement"><span class="secnum">14.14</span> The <code>try</code> Statement</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-functions-and-classes" title="ECMAScript Language: Functions and Classes"><span class="secnum">15</span> ECMAScript Language: Functions and Classes</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-class-definitions" title="Class Definitions"><span class="secnum">15.7</span> Class Definitions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-runtime-semantics-classdefinitionevaluation" title="Runtime Semantics: ClassDefinitionEvaluation"><span class="secnum">15.7.14</span> RS: ClassDefinitionEvaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-tail-position-calls" title="Tail Position Calls"><span class="secnum">15.10</span> Tail Position Calls</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-hascallintailposition" title="Static Semantics: HasCallInTailPosition"><span class="secnum">15.10.2</span> SS: HasCallInTailPosition</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-fundamental-objects" title="Fundamental Objects"><span class="secnum">20</span> Fundamental Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-object-objects" title="Object Objects"><span class="secnum">20.1</span> Object Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-object-constructor" title="Properties of the Object Constructor"><span class="secnum">20.1.2</span> Properties of the Object Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-object-@@custommatcher" title="Object [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.1.2.24</span> Object [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-function-objects" title="Function Objects"><span class="secnum">20.2</span> Function Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-function-constructor" title="Properties of the Function Constructor"><span class="secnum">20.2.2</span> Properties of the Function Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-function-@@custommatcher" title="Function [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.2.2.2</span> Function [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-function-prototype-object" title="Properties of the Function Prototype Object"><span class="secnum">20.2.3</span> Properties of the Function Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-function.prototype-@@custommatcher" title="Function.prototype [ @@customMatcher ] ( subject, hint, receiver )"><span class="secnum">20.2.3.7</span> Function.prototype [ @@customMatcher ] ( <var>subject</var>, <var>hint</var>, <var>receiver</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-boolean-objects" title="Boolean Objects"><span class="secnum">20.3</span> Boolean Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-boolean-constructor" title="Properties of the Boolean Constructor"><span class="secnum">20.3.2</span> Properties of the Boolean Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-boolean-@@custommatcher" title="Boolean [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.3.2.2</span> Boolean [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-symbol-objects" title="Symbol Objects"><span class="secnum">20.4</span> Symbol Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-symbol-constructor" title="Properties of the Symbol Constructor"><span class="secnum">20.4.2</span> Properties of the Symbol Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-symbol.custommatcher" title="Symbol.customMatcher"><span class="secnum">20.4.2.17</span> Symbol.customMatcher</a></li><li><span class="item-toggle-none"></span><a href="#sec-symbol-@@custommatcher" title="Symbol [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.4.2.18</span> Symbol [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-error-objects" title="Error Objects"><span class="secnum">20.5</span> Error Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-error-constructor" title="The Error Constructor"><span class="secnum">20.5.1</span> The Error Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-error-message" title="Error ( message [ , options ] )"><span class="secnum">20.5.1.1</span> Error ( <var>message</var> [ , <var>options</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-error-constructors" title="Properties of the Error Constructor"><span class="secnum">20.5.2</span> Properties of the Error Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-error-@@custommatcher" title="Error [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.5.2.2</span> Error [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-error-instances" title="Properties of Error Instances"><span class="secnum">20.5.4</span> Properties of Error Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-nativeerror-object-structure" title="NativeError Object Structure"><span class="secnum">20.5.6</span> <var>NativeError</var> Object Structure</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-nativeerror-constructors" title="The NativeError Constructors"><span class="secnum">20.5.6.1</span> The <var>NativeError</var> Constructors</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-nativeerror" title="NativeError ( message [ , options ] )"><span class="secnum">20.5.6.1.1</span> <var>NativeError</var> ( <var>message</var> [ , <var>options</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-nativeerror-constructors" title="Properties of the NativeError Constructors"><span class="secnum">20.5.6.2</span> Properties of the <var>NativeError</var> Constructors</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-nativeerror-@@custommatcher" title="NativeError [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.5.6.2.2</span> <var>NativeError</var> [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-nativeerror-instances" title="Properties of NativeError Instances"><span class="secnum">20.5.6.4</span> Properties of <var>NativeError</var> Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-aggregate-error-objects" title="AggregateError Objects"><span class="secnum">20.5.7</span> AggregateError Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-aggregate-error-constructor" title="The AggregateError Constructor"><span class="secnum">20.5.7.1</span> The AggregateError Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-aggregate-error" title="AggregateError ( errors, message [ , options ] )"><span class="secnum">20.5.7.1.1</span> AggregateError ( <var>errors</var>, <var>message</var> [ , <var>options</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-aggregate-error-constructors" title="Properties of the AggregateError Constructor"><span class="secnum">20.5.7.2</span> Properties of the AggregateError Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-aggregate-error-@@custommatcher" title="AggregateError [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.5.7.2.2</span> AggregateError [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-aggregate-error-instances" title="Properties of AggregateError Instances"><span class="secnum">20.5.7.4</span> Properties of AggregateError Instances</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-numbers-and-dates" title="Numbers and Dates"><span class="secnum">21</span> Numbers and Dates</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-number-objects" title="Number Objects"><span class="secnum">21.1</span> Number Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-number-constructor" title="Properties of the Number Constructor"><span class="secnum">21.1.2</span> Properties of the Number Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-number-@@custommatcher" title="Number [ @@customMatcher ] ( subject, hint )"><span class="secnum">21.1.2.16</span> Number [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-bigint-objects" title="BigInt Objects"><span class="secnum">21.2</span> BigInt Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-bigint-constructor" title="Properties of the BigInt Constructor"><span class="secnum">21.2.2</span> Properties of the BigInt Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-bigint-@@custommatcher" title="BigInt [ @@customMatcher ] ( subject, hint )"><span class="secnum">21.2.2.4</span> BigInt [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-date-objects" title="Date Objects"><span class="secnum">21.4</span> Date Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-date-constructor" title="Properties of the Date Constructor"><span class="secnum">21.4.3</span> Properties of the Date Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-date-@@custommatcher" title="Date [ @@customMatcher ] ( subject, hint )"><span class="secnum">21.4.3.5</span> Date [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-text-processing" title="Text Processing"><span class="secnum">22</span> Text Processing</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-string-objects" title="String Objects"><span class="secnum">22.1</span> String Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-string-constructor" title="Properties of the String Constructor"><span class="secnum">22.1.2</span> Properties of the String Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-string-@@custommatcher" title="String [ @@customMatcher ] ( subject, hint )"><span class="secnum">22.1.2.5</span> String [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-regexp-regular-expression-objects" title="RegExp (Regular Expression) Objects"><span class="secnum">22.2</span> RegExp (Regular Expression) Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-patterns" title="Patterns"><span class="secnum">22.2.1</span> Patterns</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-patterns-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">22.2.1.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-capturinggroupname" title="Static Semantics: CapturingGroupName"><span class="secnum">22.2.1.9</span> SS: CapturingGroupName</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-abstract-operations-for-regexp-creation" title="Abstract Operations for RegExp Creation"><span class="secnum">22.2.3</span> Abstract Operations for RegExp Creation</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexpcreate" title="RegExpCreate ( P, F )"><span class="secnum">22.2.3.1</span> RegExpCreate ( <var>P</var>, <var>F</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-regexpinitialize" title="RegExpInitialize ( obj, pattern, flags, canCreateBinding )"><span class="secnum">22.2.3.3</span> RegExpInitialize ( <var>obj</var>, <var>pattern</var>, <var>flags</var>, <ins><var>canCreateBinding</var></ins> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-parsepattern" title="Static Semantics: ParsePattern ( patternText, u, v, canCreateBinding )"><span class="secnum">22.2.3.4</span> SS: ParsePattern ( <var>patternText</var>, <var>u</var>, <var>v</var>, <ins><var>canCreateBinding</var></ins> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-regexp-constructor" title="The RegExp Constructor"><span class="secnum">22.2.4</span> The RegExp Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexp-pattern-flags" title="RegExp ( pattern, flags )"><span class="secnum">22.2.4.1</span> RegExp ( <var>pattern</var>, <var>flags</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-regexp-constructor" title="Properties of the RegExp Constructor"><span class="secnum">22.2.5</span> Properties of the RegExp Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexp-@@custommatcher" title="RegExp [ @@customMatcher ] ( subject, hint )"><span class="secnum">22.2.5.3</span> RegExp [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-regexp-prototype-object" title="Properties of the RegExp Prototype Object"><span class="secnum">22.2.6</span> Properties of the RegExp Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexp.prototype-@@custommatcher" title="RegExp.prototype [ @@customMatcher ] ( subject, hint )"><span class="secnum">22.2.6.20</span> RegExp.prototype [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-indexed-collections" title="Indexed Collections"><span class="secnum">23</span> Indexed Collections</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-array-objects" title="Array Objects"><span class="secnum">23.1</span> Array Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-array-constructor" title="Properties of the Array Constructor"><span class="secnum">23.1.2</span> Properties of the Array Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-array-@@custommatcher" title="Array [ @@customMatcher ] ( subject, hint )"><span class="secnum">23.1.2.6</span> Array [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-typedarray-objects" title="TypedArray Objects"><span class="secnum">23.2</span> TypedArray Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-typedarray-constructors" title="Properties of the TypedArray Constructors"><span class="secnum">23.2.6</span> Properties of the <var>TypedArray</var> Constructors</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-_typedarray_-@@custommatcher" title="TypedArray [ @@customMatcher ] ( subject, hint )"><span class="secnum">23.2.6.3</span> <var>TypedArray</var> [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-keyed-collections" title="Keyed Collections"><span class="secnum">24</span> Keyed Collections</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-map-objects" title="Map Objects"><span class="secnum">24.1</span> Map Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-map-constructor" title="Properties of the Map Constructor"><span class="secnum">24.1.2</span> Properties of the Map Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-map-@@custommatcher" title="Map [ @@customMatcher ] ( subject, hint )"><span class="secnum">24.1.2.3</span> Map [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-set-objects" title="Set Objects"><span class="secnum">24.2</span> Set Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-set-constructor" title="Properties of the Set Constructor"><span class="secnum">24.2.2</span> Properties of the Set Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-set-@@custommatcher" title="Set [ @@customMatcher ] ( subject, hint )"><span class="secnum">24.2.2.3</span> Set [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-weakmap-objects" title="WeakMap Objects"><span class="secnum">24.3</span> WeakMap Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-weakmap-constructor" title="Properties of the WeakMap Constructor"><span class="secnum">24.3.2</span> Properties of the WeakMap Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-weakmap-@@custommatcher" title="WeakMap [ @@customMatcher ] ( subject, hint )"><span class="secnum">24.3.2.2</span> WeakMap [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-weakset-objects" title="WeakSet Objects"><span class="secnum">24.4</span> WeakSet Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-weakset-constructor" title="Properties of the WeakSet Constructor"><span class="secnum">24.4.2</span> Properties of the WeakSet Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-weakset-@@custommatcher" title="WeakSet [ @@customMatcher ] ( subject, hint )"><span class="secnum">24.4.2.2</span> WeakSet [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-structured-data" title="Structured Data"><span class="secnum">25</span> Structured Data</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-arraybuffer-objects" title="ArrayBuffer Objects"><span class="secnum">25.1</span> ArrayBuffer Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-arraybuffer-constructor" title="Properties of the ArrayBuffer Constructor"><span class="secnum">25.1.5</span> Properties of the ArrayBuffer Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-arraybuffer-@@custommatcher" title="ArrayBuffer [ @@customMatcher ] ( subject, hint )"><span class="secnum">25.1.5.4</span> ArrayBuffer [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-sharedarraybuffer-objects" title="SharedArrayBuffer Objects"><span class="secnum">25.2</span> SharedArrayBuffer Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-sharedarraybuffer-constructor" title="Properties of the SharedArrayBuffer Constructor"><span class="secnum">25.2.4</span> Properties of the SharedArrayBuffer Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-sharedarraybuffer-@@custommatcher" title="SharedArrayBuffer [ @@customMatcher ] ( subject, hint )"><span class="secnum">25.2.4.3</span> SharedArrayBuffer [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-dataview-objects" title="DataView Objects"><span class="secnum">25.3</span> DataView Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-dataview-constructor" title="Properties of the DataView Constructor"><span class="secnum">25.3.3</span> Properties of the DataView Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-dataview-@@custommatcher" title="DataView [ @@customMatcher ] ( subject, hint )"><span class="secnum">25.3.3.2</span> DataView [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-managing-memory" title="Managing Memory"><span class="secnum">26</span> Managing Memory</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-weak-ref-objects" title="WeakRef Objects"><span class="secnum">26.1</span> WeakRef Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-weak-ref-constructor" title="Properties of the WeakRef Constructor"><span class="secnum">26.1.2</span> Properties of the WeakRef Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-weakref-@@custommatcher" title="WeakRef [ @@customMatcher ] ( subject, hint )"><span class="secnum">26.1.2.2</span> WeakRef [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-finalization-registry-objects" title="FinalizationRegistry Objects"><span class="secnum">26.2</span> FinalizationRegistry Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-finalization-registry-constructor" title="Properties of the FinalizationRegistry Constructor"><span class="secnum">26.2.2</span> Properties of the FinalizationRegistry Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-finalizationregistry-@@custommatcher" title="FinalizationRegistry [ @@customMatcher ] ( subject, hint )"><span class="secnum">26.2.2.2</span> FinalizationRegistry [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-control-abstraction-objects" title="Control Abstraction Objects"><span class="secnum">27</span> Control Abstraction Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-promise-objects" title="Promise Objects"><span class="secnum">27.2</span> Promise Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-promise-constructor" title="Properties of the Promise Constructor"><span class="secnum">27.2.4</span> Properties of the Promise Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-promise-@@custommatcher" title="Promise [ @@customMatcher ] ( subject, hint )"><span class="secnum">27.2.4.9</span> Promise [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-reflection" title="Reflection"><span class="secnum">28</span> Reflection</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-proxy-objects" title="Proxy Objects"><span class="secnum">28.2</span> Proxy Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-proxy-constructor" title="The Proxy Constructor"><span class="secnum">28.2.1</span> The Proxy Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-proxy-@@custommatcher" title="Proxy [ @@customMatcher ] ( )"><span class="secnum">28.2.1.2</span> Proxy [ @@customMatcher ] ( )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-pattern-matching" title="Pattern Matching"><span class="secnum">30</span> <ins>Pattern Matching</ins></a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-match-patterns" title="Match Patterns"><span class="secnum">30.1</span> Match Patterns</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-match-patterns-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">30.1.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="#sec-is-optional-pattern" title="Static Semantics: IsOptionalPattern"><span class="secnum">30.1.2</span> SS: IsOptionalPattern</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-pattern-matches" title="Runtime Semantics: MatchPatternMatches"><span class="secnum">30.1.3</span> RS: MatchPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-primitive-pattern-matches" title="Runtime Semantics: PrimitivePatternMatches"><span class="secnum">30.1.4</span> RS: PrimitivePatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-binding-pattern-matches" title="Runtime Semantics: BindingPatternMatches"><span class="secnum">30.1.5</span> RS: BindingPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-regular-expression-pattern-matches" title="Runtime Semantics: RegularExpressionPatternMatches"><span class="secnum">30.1.6</span> RS: RegularExpressionPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-member-expression-pattern-matches" title="Runtime Semantics: MemberExpressionPatternMatches"><span class="secnum">30.1.7</span> RS: MemberExpressionPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-object-pattern-matches" title="Runtime Semantics: ObjectPatternMatches"><span class="secnum">30.1.8</span> RS: ObjectPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-object-pattern-inner-matches" title="Runtime Semantics: ObjectPatternInnerMatches"><span class="secnum">30.1.9</span> RS: ObjectPatternInnerMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-array-pattern-matches" title="Runtime Semantics: ArrayPatternMatches"><span class="secnum">30.1.10</span> RS: ArrayPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-list-pattern-matches" title="Runtime Semantics: ListPatternMatches"><span class="secnum">30.1.11</span> RS: ListPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-list-pattern-inner-matches" title="Runtime Semantics: ListPatternInnerMatches"><span class="secnum">30.1.12</span> RS: ListPatternInnerMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-unary-algebraic-pattern-matches" title="Runtime Semantics: UnaryAlgebraicPatternMatches"><span class="secnum">30.1.13</span> RS: UnaryAlgebraicPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-relational-pattern-matches" title="Runtime Semantics: RelationalPatternMatches"><span class="secnum">30.1.14</span> RS: RelationalPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-if-pattern-matches" title="Runtime Semantics: IfPatternMatches"><span class="secnum">30.1.15</span> RS: IfPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-combined-match-pattern-matches" title="Runtime Semantics: CombinedMatchPatternMatches"><span class="secnum">30.1.16</span> RS: CombinedMatchPatternMatches</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-match-expression" title="The match Expression"><span class="secnum">30.2</span> The <code>match</code> Expression</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-match-expression-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">30.2.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-expression-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">30.2.2</span> RS: Evaluation</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-expression-clauses-runtime-semantics-evaluation" title="Runtime Semantics: MatchExpressionClausesEvaluation"><span class="secnum">30.2.3</span> RS: MatchExpressionClausesEvaluation</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-expression-clause-runtime-semantics-evaluation" title="Runtime Semantics: MatchExpressionClauseEvaluation"><span class="secnum">30.2.4</span> RS: MatchExpressionClauseEvaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-abstract-operations-for-pattern-matching" title="Abstract Operations for Pattern Matching"><span class="secnum">30.3</span> Abstract Operations for Pattern Matching</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-invoke-custom-matcher" title="InvokeCustomMatcher ( matcher, subject, cacheGroup, kind, receiver )"><span class="secnum">30.3.1</span> InvokeCustomMatcher ( <var>matcher</var>, <var>subject</var>, <var>cacheGroup</var>, <var>kind</var>, <var>receiver</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-validatecustommatcherhint" title="ValidateCustomMatcherHint ( hint [ , kind ] )"><span class="secnum">30.3.2</span> ValidateCustomMatcherHint ( <var>hint</var> [ , <var>kind</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-creatematchcache" title="CreateMatchCache ( )"><span class="secnum">30.3.3</span> CreateMatchCache ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-get-match-cache" title="GetMatchCache ( subject, cacheGroup )"><span class="secnum">30.3.4</span> GetMatchCache ( <var>subject</var>, <var>cacheGroup</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-has-property-cached" title="HasPropertyCached ( subject, cacheGroup, propertyName )"><span class="secnum">30.3.5</span> HasPropertyCached ( <var>subject</var>, <var>cacheGroup</var>, <var>propertyName</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-get-cached" title="GetCached ( subject, cacheGroup, propertyName )"><span class="secnum">30.3.6</span> GetCached ( <var>subject</var>, <var>cacheGroup</var>, <var>propertyName</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-get-iterator-cached" title="GetIteratorCached ( subject, cacheGroup )"><span class="secnum">30.3.7</span> GetIteratorCached ( <var>subject</var>, <var>cacheGroup</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-iterator-step-cached" title="IteratorStepCached ( iterator, cacheGroup )"><span class="secnum">30.3.8</span> IteratorStepCached ( <var>iterator</var>, <var>cacheGroup</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-get-iterator-nth-value-cached" title="GetIteratorNthValueCached ( iterator, cacheGroup, n )"><span class="secnum">30.3.9</span> GetIteratorNthValueCached ( <var>iterator</var>, <var>cacheGroup</var>, <var>n</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-finish-list-match" title="FinishListMatch ( iterator, cacheGroup, expectedLength )"><span class="secnum">30.3.10</span> FinishListMatch ( <var>iterator</var>, <var>cacheGroup</var>, <var>expectedLength</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-finish-match" title="FinishMatch ( matchCompletion, cacheGroup )"><span class="secnum">30.3.11</span> FinishMatch ( <var>matchCompletion</var>, <var>cacheGroup</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-grammar-summary" title="Grammar Summary"><span class="secnum">A</span> Grammar Summary</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-expressions" title="Expressions"><span class="secnum">A.1</span> Expressions</a></li><li><span class="item-toggle-none"></span><a href="#sec-annex-match-patterns" title="Patterns"><span class="secnum">A.9</span> Patterns</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-additional-ecmascript-features-for-web-browsers" title="Additional ECMAScript Features for Web Browsers"><span class="secnum">B</span> Additional ECMAScript Features for Web Browsers</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-additional-syntax" title="Additional Syntax"><span class="secnum">B.1</span> Additional Syntax</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-regular-expressions-patterns" title="Regular Expressions Patterns"><span class="secnum">B.1.2</span> Regular Expressions Patterns</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-parsepattern-annexb" title="Static Semantics: ParsePattern ( patternText, u, v, canCreateBinding )"><span class="secnum">B.1.2.9</span> SS: ParsePattern ( <var>patternText</var>, <var>u</var>, <var>v</var><ins>, <var>canCreateBinding</var></ins> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-additional-built-in-properties" title="Additional Built-in Properties"><span class="secnum">B.2</span> Additional Built-in Properties</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-additional-properties-of-the-regexp.prototype-object" title="Additional Properties of the RegExp.prototype Object"><span class="secnum">B.2.4</span> Additional Properties of the RegExp.prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexp.prototype.compile" title="RegExp.prototype.compile ( pattern, flags )"><span class="secnum">B.2.4.1</span> RegExp.prototype.compile ( <var>pattern</var>, <var>flags</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-copyright-and-software-license" title="Copyright &amp; Software License"><span class="secnum">C</span> Copyright &amp; Software License</a></li></ol></div></div><div id="spec-container"><h1 class="version">Stage 1 Draft / March 28, 2024</h1><h1 class="title">Pattern Matching</h1>
+    </svg></div><div id="menu-spacer" class="menu-spacer"></div><div id="menu"><div id="menu-search"><input type="text" id="menu-search-box" placeholder="Search..."><div id="menu-search-results" class="inactive"></div></div><div id="menu-pins"><div class="menu-pane-header">Pins<button class="unpin-all">clear</button></div><ul id="menu-pins-list"></ul></div><div class="menu-pane-header">Table of Contents</div><div id="menu-toc"><ol class="toc"><li><span class="item-toggle">+</span><a href="#welcome" title="Welcome">Welcome</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-todos" title="TODOs">TODOs</a></li><li><span class="item-toggle-none"></span><a href="#sec-nav" title="Introduction">Introduction</a></li><li><span class="item-toggle-none"></span><a href="#sec-notes-layering" title="Layering">Layering</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-overview" title="Overview"><span class="secnum">4</span> Overview</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-organization-of-this-specification" title="Organization of This Specification"><span class="secnum">4.5</span> Organization of This Specification</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-data-types-and-values" title="ECMAScript Data Types and Values"><span class="secnum">6</span> ECMAScript Data Types and Values</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-types" title="ECMAScript Language Types"><span class="secnum">6.1</span> ECMAScript Language Types</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-types-symbol-type" title="The Symbol Type"><span class="secnum">6.1.5</span> The Symbol Type</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-well-known-symbols" title="Well-Known Symbols"><span class="secnum">6.1.5.1</span> Well-Known Symbols</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-object-internal-methods-and-internal-slots" title="Object Internal Methods and Internal Slots"><span class="secnum">6.1.7</span> Object Internal Methods and Internal Slots</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-abstract-operations" title="Abstract Operations"><span class="secnum">7</span> Abstract Operations</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-operations-on-objects" title="Operations on Objects"><span class="secnum">7.3</span> Operations on Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-initializeinstance" title="InitializeInstanceElements ( O, constructor )"><span class="secnum">7.3.34</span> InitializeInstanceElements ( <var>O</var>, <var>constructor</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-syntax-directed-operations" title="Syntax-Directed Operations"><span class="secnum">8</span> Syntax-Directed Operations</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-syntax-directed-operations-scope-analysis" title="Scope Analysis"><span class="secnum">8.2</span> Scope Analysis</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-boundnames" title="Static Semantics: BoundNames"><span class="secnum">8.2.1</span> SS: BoundNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-declarationpart" title="Static Semantics: DeclarationPart"><span class="secnum">8.2.2</span> SS: DeclarationPart</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-isconstantdeclaration" title="Static Semantics: IsConstantDeclaration"><span class="secnum">8.2.3</span> SS: IsConstantDeclaration</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-lexicallydeclarednames" title="Static Semantics: LexicallyDeclaredNames"><span class="secnum">8.2.4</span> SS: LexicallyDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-lexicallyscopeddeclarations" title="Static Semantics: LexicallyScopedDeclarations"><span class="secnum">8.2.5</span> SS: LexicallyScopedDeclarations</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-vardeclarednames" title="Static Semantics: VarDeclaredNames"><span class="secnum">8.2.6</span> SS: VarDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-varscopeddeclarations" title="Static Semantics: VarScopedDeclarations"><span class="secnum">8.2.7</span> SS: VarScopedDeclarations</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-toplevellexicallydeclarednames" title="Static Semantics: TopLevelLexicallyDeclaredNames"><span class="secnum">8.2.8</span> SS: TopLevelLexicallyDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-toplevellexicallyscopeddeclarations" title="Static Semantics: TopLevelLexicallyScopedDeclarations"><span class="secnum">8.2.9</span> SS: TopLevelLexicallyScopedDeclarations</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-toplevelvardeclarednames" title="Static Semantics: TopLevelVarDeclaredNames"><span class="secnum">8.2.10</span> SS: TopLevelVarDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-toplevelvarscopeddeclarations" title="Static Semantics: TopLevelVarScopedDeclarations"><span class="secnum">8.2.11</span> SS: TopLevelVarScopedDeclarations</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-syntax-directed-operations-miscellaneous" title="Miscellaneous"><span class="secnum">8.6</span> Miscellaneous</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-runtime-semantics-bindinginitialization" title="Runtime Semantics: BindingInitialization"><span class="secnum">8.6.2</span> RS: BindingInitialization</a></li><li><span class="item-toggle-none"></span><a href="#sec-runtime-semantics-iteratorbindinginitialization" title="Runtime Semantics: IteratorBindingInitialization"><span class="secnum">8.6.3</span> RS: IteratorBindingInitialization</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-executable-code-and-execution-contexts" title="Executable Code and Execution Contexts"><span class="secnum">9</span> Executable Code and Execution Contexts</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-weakly-hold-targets-processing-model" title="Processing Model of WeakRef and FinalizationRegistryweakly hold Targets"><span class="secnum">9.10</span> Processing Model of <del>WeakRef and FinalizationRegistry</del><ins>weakly hold</ins> Targets</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-weakly-hold-execution" title="Execution"><span class="secnum">9.10.3</span> Execution</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-lexical-grammar" title="ECMAScript Language: Lexical Grammar"><span class="secnum">12</span> ECMAScript Language: Lexical Grammar</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-automatic-semicolon-insertion" title="Automatic Semicolon Insertion"><span class="secnum">12.10</span> Automatic Semicolon Insertion</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-rules-of-automatic-semicolon-insertion" title="Rules of Automatic Semicolon Insertion"><span class="secnum">12.10.1</span> Rules of Automatic Semicolon Insertion</a></li><li><span class="item-toggle">+</span><a href="#sec-interesting-cases-of-automatic-semicolon-insertion" title="Interesting Cases of Automatic Semicolon Insertion"><span class="secnum">12.10.3</span> Interesting Cases of Automatic Semicolon Insertion</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-asi-cases-with-no-lineterminator-here" title="Cases of Automatic Semicolon Insertion and “[no LineTerminator here]”"><span class="secnum">12.10.3.2</span> Cases of Automatic Semicolon Insertion and “[no <emu-nt>LineTerminator</emu-nt> here]”</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-no-lineterminator-here-automatic-semicolon-insertion-list" title="List of Grammar Productions with Optional Operands and “[no LineTerminator here]”"><span class="secnum">12.10.3.2.1</span> List of Grammar Productions with Optional Operands and “[no <emu-nt>LineTerminator</emu-nt> here]”</a></li></ol></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-expressions" title="ECMAScript Language: Expressions"><span class="secnum">13</span> ECMAScript Language: Expressions</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-primary-expression" title="Primary Expression"><span class="secnum">13.2</span> Primary Expression</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-primary-expression-regular-expression-literals" title="Regular Expression Literals"><span class="secnum">13.2.7</span> Regular Expression Literals</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-primary-expression-regular-expression-literals-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">13.2.7.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="#sec-isvalidregularexpressionliteral" title="Static Semantics: IsValidRegularExpressionLiteral ( literal, canCreateBinding )"><span class="secnum">13.2.7.2</span> SS: IsValidRegularExpressionLiteral ( <var>literal</var>, <ins><var>canCreateBinding</var></ins> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-primary-expression-match-expression" title="Match Expression"><span class="secnum">13.2.10</span> Match Expression</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-relational-operators" title="Relational Operators"><span class="secnum">13.10</span> Relational Operators</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-relational-operators-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.10.1</span> RS: Evaluation</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-statements-and-declarations" title="ECMAScript Language: Statements and Declarations"><span class="secnum">14</span> ECMAScript Language: Statements and Declarations</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-iteration-statements" title="Iteration Statements"><span class="secnum">14.7</span> Iteration Statements</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-for-in-and-for-of-statements" title="The for-in, for-of, and for-await-of Statements"><span class="secnum">14.7.1</span> The <code>for</code>-<code>in</code>, <code>for</code>-<code>of</code>, and <code>for</code>-<code>await</code>-<code>of</code> Statements</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-try-statement" title="The try Statement"><span class="secnum">14.14</span> The <code>try</code> Statement</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-functions-and-classes" title="ECMAScript Language: Functions and Classes"><span class="secnum">15</span> ECMAScript Language: Functions and Classes</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-class-definitions" title="Class Definitions"><span class="secnum">15.7</span> Class Definitions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-runtime-semantics-classdefinitionevaluation" title="Runtime Semantics: ClassDefinitionEvaluation"><span class="secnum">15.7.14</span> RS: ClassDefinitionEvaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-tail-position-calls" title="Tail Position Calls"><span class="secnum">15.10</span> Tail Position Calls</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-hascallintailposition" title="Static Semantics: HasCallInTailPosition"><span class="secnum">15.10.2</span> SS: HasCallInTailPosition</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-fundamental-objects" title="Fundamental Objects"><span class="secnum">20</span> Fundamental Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-object-objects" title="Object Objects"><span class="secnum">20.1</span> Object Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-object-constructor" title="Properties of the Object Constructor"><span class="secnum">20.1.2</span> Properties of the Object Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-object-%symbol.custommatcher%" title="Object [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">20.1.2.24</span> Object [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-function-objects" title="Function Objects"><span class="secnum">20.2</span> Function Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-function-constructor" title="Properties of the Function Constructor"><span class="secnum">20.2.2</span> Properties of the Function Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-function-%symbol.custommatcher%" title="Function [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">20.2.2.2</span> Function [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-function-prototype-object" title="Properties of the Function Prototype Object"><span class="secnum">20.2.3</span> Properties of the Function Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-function.prototype-%symbol.custommatcher%" title="Function.prototype [ %Symbol.customMatcher% ] ( subject, hint, receiver )"><span class="secnum">20.2.3.7</span> Function.prototype [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var>, <var>receiver</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-boolean-objects" title="Boolean Objects"><span class="secnum">20.3</span> Boolean Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-boolean-constructor" title="Properties of the Boolean Constructor"><span class="secnum">20.3.2</span> Properties of the Boolean Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-boolean-%symbol.custommatcher%" title="Boolean [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">20.3.2.2</span> Boolean [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-symbol-objects" title="Symbol Objects"><span class="secnum">20.4</span> Symbol Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-symbol-constructor" title="Properties of the Symbol Constructor"><span class="secnum">20.4.2</span> Properties of the Symbol Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-symbol.custommatcher" title="Symbol.customMatcher"><span class="secnum">20.4.2.17</span> Symbol.customMatcher</a></li><li><span class="item-toggle-none"></span><a href="#sec-symbol-%symbol.custommatcher%" title="Symbol [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">20.4.2.18</span> Symbol [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-error-objects" title="Error Objects"><span class="secnum">20.5</span> Error Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-error-constructor" title="The Error Constructor"><span class="secnum">20.5.1</span> The Error Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-error-message" title="Error ( message [ , options ] )"><span class="secnum">20.5.1.1</span> Error ( <var>message</var> [ , <var>options</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-error-constructors" title="Properties of the Error Constructor"><span class="secnum">20.5.2</span> Properties of the Error Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-error-%symbol.custommatcher%" title="Error [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">20.5.2.2</span> Error [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-error-instances" title="Properties of Error Instances"><span class="secnum">20.5.4</span> Properties of Error Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-nativeerror-object-structure" title="NativeError Object Structure"><span class="secnum">20.5.6</span> <var>NativeError</var> Object Structure</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-nativeerror-constructors" title="The NativeError Constructors"><span class="secnum">20.5.6.1</span> The <var>NativeError</var> Constructors</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-nativeerror" title="NativeError ( message [ , options ] )"><span class="secnum">20.5.6.1.1</span> <var>NativeError</var> ( <var>message</var> [ , <var>options</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-nativeerror-constructors" title="Properties of the NativeError Constructors"><span class="secnum">20.5.6.2</span> Properties of the <var>NativeError</var> Constructors</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-nativeerror-%symbol.custommatcher%" title="NativeError [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">20.5.6.2.2</span> <var>NativeError</var> [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-nativeerror-instances" title="Properties of NativeError Instances"><span class="secnum">20.5.6.4</span> Properties of <var>NativeError</var> Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-aggregate-error-objects" title="AggregateError Objects"><span class="secnum">20.5.7</span> AggregateError Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-aggregate-error-constructor" title="The AggregateError Constructor"><span class="secnum">20.5.7.1</span> The AggregateError Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-aggregate-error" title="AggregateError ( errors, message [ , options ] )"><span class="secnum">20.5.7.1.1</span> AggregateError ( <var>errors</var>, <var>message</var> [ , <var>options</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-aggregate-error-constructors" title="Properties of the AggregateError Constructor"><span class="secnum">20.5.7.2</span> Properties of the AggregateError Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-aggregate-error-%symbol.custommatcher%" title="AggregateError [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">20.5.7.2.2</span> AggregateError [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-aggregate-error-instances" title="Properties of AggregateError Instances"><span class="secnum">20.5.7.4</span> Properties of AggregateError Instances</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-numbers-and-dates" title="Numbers and Dates"><span class="secnum">21</span> Numbers and Dates</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-number-objects" title="Number Objects"><span class="secnum">21.1</span> Number Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-number-constructor" title="Properties of the Number Constructor"><span class="secnum">21.1.2</span> Properties of the Number Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-number-%symbol.custommatcher%" title="Number [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">21.1.2.16</span> Number [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-bigint-objects" title="BigInt Objects"><span class="secnum">21.2</span> BigInt Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-bigint-constructor" title="Properties of the BigInt Constructor"><span class="secnum">21.2.2</span> Properties of the BigInt Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-bigint-%symbol.custommatcher%" title="BigInt [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">21.2.2.4</span> BigInt [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-date-objects" title="Date Objects"><span class="secnum">21.4</span> Date Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-date-constructor" title="Properties of the Date Constructor"><span class="secnum">21.4.3</span> Properties of the Date Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-date-%symbol.custommatcher%" title="Date [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">21.4.3.5</span> Date [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-text-processing" title="Text Processing"><span class="secnum">22</span> Text Processing</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-string-objects" title="String Objects"><span class="secnum">22.1</span> String Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-string-constructor" title="Properties of the String Constructor"><span class="secnum">22.1.2</span> Properties of the String Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-string-%symbol.custommatcher%" title="String [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">22.1.2.5</span> String [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-regexp-regular-expression-objects" title="RegExp (Regular Expression) Objects"><span class="secnum">22.2</span> RegExp (Regular Expression) Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-patterns" title="Patterns"><span class="secnum">22.2.1</span> Patterns</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-patterns-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">22.2.1.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-capturinggroupname" title="Static Semantics: CapturingGroupName"><span class="secnum">22.2.1.9</span> SS: CapturingGroupName</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-abstract-operations-for-regexp-creation" title="Abstract Operations for RegExp Creation"><span class="secnum">22.2.3</span> Abstract Operations for RegExp Creation</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexpcreate" title="RegExpCreate ( P, F )"><span class="secnum">22.2.3.1</span> RegExpCreate ( <var>P</var>, <var>F</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-regexpinitialize" title="RegExpInitialize ( obj, pattern, flags, canCreateBinding )"><span class="secnum">22.2.3.3</span> RegExpInitialize ( <var>obj</var>, <var>pattern</var>, <var>flags</var>, <ins><var>canCreateBinding</var></ins> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-parsepattern" title="Static Semantics: ParsePattern ( patternText, u, v, canCreateBinding )"><span class="secnum">22.2.3.4</span> SS: ParsePattern ( <var>patternText</var>, <var>u</var>, <var>v</var>, <ins><var>canCreateBinding</var></ins> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-regexp-constructor" title="The RegExp Constructor"><span class="secnum">22.2.4</span> The RegExp Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexp-pattern-flags" title="RegExp ( pattern, flags )"><span class="secnum">22.2.4.1</span> RegExp ( <var>pattern</var>, <var>flags</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-regexp-constructor" title="Properties of the RegExp Constructor"><span class="secnum">22.2.5</span> Properties of the RegExp Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexp-%symbol.custommatcher%" title="RegExp [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">22.2.5.3</span> RegExp [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-regexp-prototype-object" title="Properties of the RegExp Prototype Object"><span class="secnum">22.2.6</span> Properties of the RegExp Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexp.prototype-%symbol.custommatcher%" title="RegExp.prototype [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">22.2.6.20</span> RegExp.prototype [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-indexed-collections" title="Indexed Collections"><span class="secnum">23</span> Indexed Collections</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-array-objects" title="Array Objects"><span class="secnum">23.1</span> Array Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-array-constructor" title="Properties of the Array Constructor"><span class="secnum">23.1.2</span> Properties of the Array Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-array-%symbol.custommatcher%" title="Array [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">23.1.2.6</span> Array [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-typedarray-objects" title="TypedArray Objects"><span class="secnum">23.2</span> TypedArray Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-typedarray-constructors" title="Properties of the TypedArray Constructors"><span class="secnum">23.2.6</span> Properties of the <var>TypedArray</var> Constructors</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-_typedarray_-%symbol.custommatcher%" title="TypedArray [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">23.2.6.3</span> <var>TypedArray</var> [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-keyed-collections" title="Keyed Collections"><span class="secnum">24</span> Keyed Collections</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-map-objects" title="Map Objects"><span class="secnum">24.1</span> Map Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-map-constructor" title="Properties of the Map Constructor"><span class="secnum">24.1.2</span> Properties of the Map Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-map-%symbol.custommatcher%" title="Map [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">24.1.2.3</span> Map [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-set-objects" title="Set Objects"><span class="secnum">24.2</span> Set Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-set-constructor" title="Properties of the Set Constructor"><span class="secnum">24.2.2</span> Properties of the Set Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-set-%symbol.custommatcher%" title="Set [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">24.2.2.3</span> Set [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-weakmap-objects" title="WeakMap Objects"><span class="secnum">24.3</span> WeakMap Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-weakmap-constructor" title="Properties of the WeakMap Constructor"><span class="secnum">24.3.2</span> Properties of the WeakMap Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-weakmap-%symbol.custommatcher%" title="WeakMap [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">24.3.2.2</span> WeakMap [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-weakset-objects" title="WeakSet Objects"><span class="secnum">24.4</span> WeakSet Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-weakset-constructor" title="Properties of the WeakSet Constructor"><span class="secnum">24.4.2</span> Properties of the WeakSet Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-weakset-%symbol.custommatcher%" title="WeakSet [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">24.4.2.2</span> WeakSet [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-structured-data" title="Structured Data"><span class="secnum">25</span> Structured Data</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-arraybuffer-objects" title="ArrayBuffer Objects"><span class="secnum">25.1</span> ArrayBuffer Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-arraybuffer-constructor" title="Properties of the ArrayBuffer Constructor"><span class="secnum">25.1.5</span> Properties of the ArrayBuffer Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-arraybuffer-%symbol.custommatcher%" title="ArrayBuffer [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">25.1.5.4</span> ArrayBuffer [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-sharedarraybuffer-objects" title="SharedArrayBuffer Objects"><span class="secnum">25.2</span> SharedArrayBuffer Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-sharedarraybuffer-constructor" title="Properties of the SharedArrayBuffer Constructor"><span class="secnum">25.2.4</span> Properties of the SharedArrayBuffer Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-sharedarraybuffer-%symbol.custommatcher%" title="SharedArrayBuffer [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">25.2.4.3</span> SharedArrayBuffer [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-dataview-objects" title="DataView Objects"><span class="secnum">25.3</span> DataView Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-dataview-constructor" title="Properties of the DataView Constructor"><span class="secnum">25.3.3</span> Properties of the DataView Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-dataview-%symbol.custommatcher%" title="DataView [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">25.3.3.2</span> DataView [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-managing-memory" title="Managing Memory"><span class="secnum">26</span> Managing Memory</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-weak-ref-objects" title="WeakRef Objects"><span class="secnum">26.1</span> WeakRef Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-weak-ref-constructor" title="Properties of the WeakRef Constructor"><span class="secnum">26.1.2</span> Properties of the WeakRef Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-weakref-%symbol.custommatcher%" title="WeakRef [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">26.1.2.2</span> WeakRef [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-finalization-registry-objects" title="FinalizationRegistry Objects"><span class="secnum">26.2</span> FinalizationRegistry Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-finalization-registry-constructor" title="Properties of the FinalizationRegistry Constructor"><span class="secnum">26.2.2</span> Properties of the FinalizationRegistry Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-finalizationregistry-%symbol.custommatcher%" title="FinalizationRegistry [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">26.2.2.2</span> FinalizationRegistry [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-control-abstraction-objects" title="Control Abstraction Objects"><span class="secnum">27</span> Control Abstraction Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-promise-objects" title="Promise Objects"><span class="secnum">27.2</span> Promise Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-promise-constructor" title="Properties of the Promise Constructor"><span class="secnum">27.2.4</span> Properties of the Promise Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-promise-%symbol.custommatcher%" title="Promise [ %Symbol.customMatcher% ] ( subject, hint )"><span class="secnum">27.2.4.9</span> Promise [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-reflection" title="Reflection"><span class="secnum">28</span> Reflection</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-proxy-objects" title="Proxy Objects"><span class="secnum">28.2</span> Proxy Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-proxy-constructor" title="The Proxy Constructor"><span class="secnum">28.2.1</span> The Proxy Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-proxy-%symbol.custommatcher%" title="Proxy [ %Symbol.customMatcher% ] ( )"><span class="secnum">28.2.1.2</span> Proxy [ %Symbol.customMatcher% ] ( )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-pattern-matching" title="Pattern Matching"><span class="secnum">30</span> <ins>Pattern Matching</ins></a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-match-patterns" title="Match Patterns"><span class="secnum">30.1</span> Match Patterns</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-match-patterns-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">30.1.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="#sec-is-optional-pattern" title="Static Semantics: IsOptionalPattern"><span class="secnum">30.1.2</span> SS: IsOptionalPattern</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-pattern-matches" title="Runtime Semantics: MatchPatternMatches"><span class="secnum">30.1.3</span> RS: MatchPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-primitive-pattern-matches" title="Runtime Semantics: PrimitivePatternMatches"><span class="secnum">30.1.4</span> RS: PrimitivePatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-binding-pattern-matches" title="Runtime Semantics: BindingPatternMatches"><span class="secnum">30.1.5</span> RS: BindingPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-regular-expression-pattern-matches" title="Runtime Semantics: RegularExpressionPatternMatches"><span class="secnum">30.1.6</span> RS: RegularExpressionPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-member-expression-pattern-matches" title="Runtime Semantics: MemberExpressionPatternMatches"><span class="secnum">30.1.7</span> RS: MemberExpressionPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-object-pattern-matches" title="Runtime Semantics: ObjectPatternMatches"><span class="secnum">30.1.8</span> RS: ObjectPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-object-pattern-inner-matches" title="Runtime Semantics: ObjectPatternInnerMatches"><span class="secnum">30.1.9</span> RS: ObjectPatternInnerMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-array-pattern-matches" title="Runtime Semantics: ArrayPatternMatches"><span class="secnum">30.1.10</span> RS: ArrayPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-list-pattern-matches" title="Runtime Semantics: ListPatternMatches"><span class="secnum">30.1.11</span> RS: ListPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-list-pattern-inner-matches" title="Runtime Semantics: ListPatternInnerMatches"><span class="secnum">30.1.12</span> RS: ListPatternInnerMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-unary-algebraic-pattern-matches" title="Runtime Semantics: UnaryAlgebraicPatternMatches"><span class="secnum">30.1.13</span> RS: UnaryAlgebraicPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-relational-pattern-matches" title="Runtime Semantics: RelationalPatternMatches"><span class="secnum">30.1.14</span> RS: RelationalPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-if-pattern-matches" title="Runtime Semantics: IfPatternMatches"><span class="secnum">30.1.15</span> RS: IfPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-combined-match-pattern-matches" title="Runtime Semantics: CombinedMatchPatternMatches"><span class="secnum">30.1.16</span> RS: CombinedMatchPatternMatches</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-match-expression" title="The match Expression"><span class="secnum">30.2</span> The <code>match</code> Expression</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-match-expression-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">30.2.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-expression-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">30.2.2</span> RS: Evaluation</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-expression-clauses-runtime-semantics-evaluation" title="Runtime Semantics: MatchExpressionClausesEvaluation"><span class="secnum">30.2.3</span> RS: MatchExpressionClausesEvaluation</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-expression-clause-runtime-semantics-evaluation" title="Runtime Semantics: MatchExpressionClauseEvaluation"><span class="secnum">30.2.4</span> RS: MatchExpressionClauseEvaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-abstract-operations-for-pattern-matching" title="Abstract Operations for Pattern Matching"><span class="secnum">30.3</span> Abstract Operations for Pattern Matching</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-invoke-custom-matcher" title="InvokeCustomMatcher ( matcher, subject, cacheGroup, kind, receiver )"><span class="secnum">30.3.1</span> InvokeCustomMatcher ( <var>matcher</var>, <var>subject</var>, <var>cacheGroup</var>, <var>kind</var>, <var>receiver</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-validatecustommatcherhint" title="ValidateCustomMatcherHint ( hint [ , kind ] )"><span class="secnum">30.3.2</span> ValidateCustomMatcherHint ( <var>hint</var> [ , <var>kind</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-creatematchcache" title="CreateMatchCache ( )"><span class="secnum">30.3.3</span> CreateMatchCache ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-get-match-cache" title="GetMatchCache ( subject, cacheGroup )"><span class="secnum">30.3.4</span> GetMatchCache ( <var>subject</var>, <var>cacheGroup</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-has-property-cached" title="HasPropertyCached ( subject, cacheGroup, propertyName )"><span class="secnum">30.3.5</span> HasPropertyCached ( <var>subject</var>, <var>cacheGroup</var>, <var>propertyName</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-get-cached" title="GetCached ( subject, cacheGroup, propertyName )"><span class="secnum">30.3.6</span> GetCached ( <var>subject</var>, <var>cacheGroup</var>, <var>propertyName</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-get-iterator-cached" title="GetIteratorCached ( subject, cacheGroup )"><span class="secnum">30.3.7</span> GetIteratorCached ( <var>subject</var>, <var>cacheGroup</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-iterator-step-cached" title="IteratorStepCached ( iterator, cacheGroup )"><span class="secnum">30.3.8</span> IteratorStepCached ( <var>iterator</var>, <var>cacheGroup</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-get-iterator-nth-value-cached" title="GetIteratorNthValueCached ( iterator, cacheGroup, n )"><span class="secnum">30.3.9</span> GetIteratorNthValueCached ( <var>iterator</var>, <var>cacheGroup</var>, <var>n</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-finish-list-match" title="FinishListMatch ( iterator, cacheGroup, expectedLength )"><span class="secnum">30.3.10</span> FinishListMatch ( <var>iterator</var>, <var>cacheGroup</var>, <var>expectedLength</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-finish-match" title="FinishMatch ( matchCompletion, cacheGroup )"><span class="secnum">30.3.11</span> FinishMatch ( <var>matchCompletion</var>, <var>cacheGroup</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-grammar-summary" title="Grammar Summary"><span class="secnum">A</span> Grammar Summary</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-expressions" title="Expressions"><span class="secnum">A.1</span> Expressions</a></li><li><span class="item-toggle-none"></span><a href="#sec-annex-match-patterns" title="Patterns"><span class="secnum">A.9</span> Patterns</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-additional-ecmascript-features-for-web-browsers" title="Additional ECMAScript Features for Web Browsers"><span class="secnum">B</span> Additional ECMAScript Features for Web Browsers</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-additional-syntax" title="Additional Syntax"><span class="secnum">B.1</span> Additional Syntax</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-regular-expressions-patterns" title="Regular Expressions Patterns"><span class="secnum">B.1.2</span> Regular Expressions Patterns</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-parsepattern-annexb" title="Static Semantics: ParsePattern ( patternText, u, v, canCreateBinding )"><span class="secnum">B.1.2.9</span> SS: ParsePattern ( <var>patternText</var>, <var>u</var>, <var>v</var><ins>, <var>canCreateBinding</var></ins> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-additional-built-in-properties" title="Additional Built-in Properties"><span class="secnum">B.2</span> Additional Built-in Properties</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-additional-properties-of-the-regexp.prototype-object" title="Additional Properties of the RegExp.prototype Object"><span class="secnum">B.2.4</span> Additional Properties of the RegExp.prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexp.prototype.compile" title="RegExp.prototype.compile ( pattern, flags )"><span class="secnum">B.2.4.1</span> RegExp.prototype.compile ( <var>pattern</var>, <var>flags</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-copyright-and-software-license" title="Copyright &amp; Software License"><span class="secnum">C</span> Copyright &amp; Software License</a></li></ol></div></div><div id="spec-container"><h1 class="version">Stage 1 Draft / March 28, 2024</h1><h1 class="title">Pattern Matching</h1>
 <style>
   #welcome .secnum, [title="Welcome"] .secnum {
     display: none;
@@ -113,10 +131,10 @@ <h1>Introduction</h1>
         <li><emu-xref href="#sec-relational-operators" title="" id="_ref_3"><a href="#sec-relational-operators">The <code>is</code> expression</a></emu-xref></li>
         <li><emu-xref href="#sec-match-expression" title="" id="_ref_4"><a href="#sec-match-expression">The <code>match</code> Expression</a></emu-xref></li>
         <li>
-          Non-trivial Built-in <emu-xref href="#sec-well-known-symbols" id="_ref_26"><a href="#sec-well-known-symbols">@@customMatcher</a></emu-xref> methods:
+          Non-trivial Built-in <emu-xref href="#sec-well-known-symbols" id="_ref_26"><a href="#sec-well-known-symbols">%Symbol.customMatcher%</a></emu-xref> methods:
           <ul>
-            <li><emu-xref href="#sec-function.prototype-@@custommatcher" title="" id="_ref_5"><a href="#sec-function.prototype-@@custommatcher">Function.prototype [ @@customMatcher ] ( <var>subject</var>, <var>hint</var>, <var>receiver</var> )</a></emu-xref></li>
-            <li><emu-xref href="#sec-regexp.prototype-@@custommatcher" title="" id="_ref_6"><a href="#sec-regexp.prototype-@@custommatcher">RegExp.prototype [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></emu-xref></li>
+            <li><emu-xref href="#sec-function.prototype-%symbol.custommatcher%" title="" id="_ref_5"><a href="#sec-function.prototype-%symbol.custommatcher%">Function.prototype [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var>, <var>receiver</var> )</a></emu-xref></li>
+            <li><emu-xref href="#sec-regexp.prototype-%symbol.custommatcher%" title="" id="_ref_6"><a href="#sec-regexp.prototype-%symbol.custommatcher%">RegExp.prototype [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></emu-xref></li>
           </ul>
         </li>
         <li>(TODO) Scope analysis changes: <emu-xref href="#sec-syntax-directed-operations" title="" id="_ref_7"><a href="#sec-syntax-directed-operations">Syntax-Directed Operations</a></emu-xref></li>
@@ -191,7 +209,7 @@ <h1><span class="secnum">6.1.5.1</span> Well-Known Symbols</h1>
             </tr>
             <tr>
               <td>
-                <ins><dfn tabindex="-1">@@customMatcher</dfn></ins>
+                <ins><dfn tabindex="-1">%Symbol.customMatcher%</dfn></ins>
               </td>
               <td>
                 <ins><code>"Symbol.customMatcher"</code></ins>
@@ -648,8 +666,8 @@ <h1><span class="secnum">20.1</span> Object Objects</h1>
     <emu-clause id="sec-properties-of-the-object-constructor" number="2">
       <h1><span class="secnum">20.1.2</span> Properties of the Object Constructor</h1>
 
-      <emu-clause id="sec-object-@@custommatcher" number="24">
-        <h1><span class="secnum">20.1.2.24</span> Object [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-object-%symbol.custommatcher%" number="24">
+        <h1><span class="secnum">20.1.2.24</span> Object [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_43"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>, <emu-const>boolean</emu-const>).</li><li>If <var>subject</var> <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">is not an Object</a></emu-xref>, return <emu-val>false</emu-val>.</li><li>Return <emu-val>true</emu-val>.</li></ol></emu-alg>
       </emu-clause>
@@ -662,8 +680,8 @@ <h1><span class="secnum">20.2</span> Function Objects</h1>
     <emu-clause id="sec-properties-of-the-function-constructor" number="2">
       <h1><span class="secnum">20.2.2</span> Properties of the Function Constructor</h1>
 
-      <emu-clause id="sec-function-@@custommatcher" number="2">
-        <h1><span class="secnum">20.2.2.2</span> Function [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-function-%symbol.custommatcher%" number="2">
+        <h1><span class="secnum">20.2.2.2</span> Function [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_44"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>, <emu-const>boolean</emu-const>).</li><li>Return <emu-xref aoid="IsCallable"><a href="https://tc39.es/ecma262/#sec-iscallable">IsCallable</a></emu-xref>(<var>subject</var>).</li></ol></emu-alg>
       </emu-clause>
@@ -672,8 +690,8 @@ <h1><span class="secnum">20.2.2.2</span> Function [ @@customMatcher ] ( <var>sub
     <emu-clause id="sec-properties-of-the-function-prototype-object" number="3">
       <h1><span class="secnum">20.2.3</span> Properties of the Function Prototype Object</h1>
 
-      <emu-clause id="sec-function.prototype-@@custommatcher" number="7">
-        <h1><span class="secnum">20.2.3.7</span> Function.prototype [ @@customMatcher ] ( <var>subject</var>, <var>hint</var>, <var>receiver</var> )</h1>
+      <emu-clause id="sec-function.prototype-%symbol.custommatcher%" number="7">
+        <h1><span class="secnum">20.2.3.7</span> Function.prototype [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var>, <var>receiver</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_45"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>).</li><li>Let <var>func</var> be the <emu-val>this</emu-val> value.</li><li>If <emu-xref aoid="IsCallable"><a href="https://tc39.es/ecma262/#sec-iscallable">IsCallable</a></emu-xref>(<var>func</var>) is false, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <var>subject</var>.<var class="field">[[ConstructedBy]]</var> contains <var>func</var>, return <emu-val>true</emu-val>.</li><li>If <var>func</var> does not have a <var class="field">[[IsClassConstructor]]</var> internal slot or <var>func</var>.<var class="field">[[IsClassConstructor]]</var> is <emu-val>false</emu-val>, return ?&nbsp;<emu-xref aoid="Call"><a href="https://tc39.es/ecma262/#sec-call" class="e-user-code">Call</a></emu-xref>(<var>func</var>, <var>receiver</var>, « <var>subject</var>, <var>hint</var>&nbsp;»).</li><li>Return <emu-val>false</emu-val>.</li></ol></emu-alg>
         <emu-note code=""><span class="note">Note</span><div class="note-contents"><pre><code class="javascript hljs"><span class="hljs-comment">// For non-class functions.</span>
@@ -706,7 +724,8 @@ <h1><span class="secnum">20.2.3.7</span> Function.prototype [ @@customMatcher ]
             There are
             <a href="https://github.com/tc39/proposal-pattern-matching/pull/293#issuecomment-1725097699" target="_blank" data-print-href="">performance concerns</a>,
             <a href="https://github.com/tc39/proposal-pattern-matching/pull/293#issuecomment-1725097699" target="_blank" data-print-href="">"hackable" concerns</a>, and
-            <a href="https://github.com/tc39/proposal-pattern-matching/pull/293#issuecomment-1725097699" target="_blank" data-print-href="">interaction with @@hasInstance concerns</a>.
+            <a href="https://github.com/tc39/proposal-pattern-matching/pull/293#issuecomment-1725097699" target="_blank" data-print-href="">interaction
+              with %Symbol.hasInstance% concerns</a>.
           </p>
           <p>Another approach is to use the <code>instanceof</code> semantics.</p>
         </div></emu-note>
@@ -720,8 +739,8 @@ <h1><span class="secnum">20.3</span> Boolean Objects</h1>
     <emu-clause id="sec-properties-of-the-boolean-constructor" number="2">
       <h1><span class="secnum">20.3.2</span> Properties of the Boolean Constructor</h1>
 
-      <emu-clause id="sec-boolean-@@custommatcher" number="2">
-        <h1><span class="secnum">20.3.2.2</span> Boolean [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-boolean-%symbol.custommatcher%" number="2">
+        <h1><span class="secnum">20.3.2.2</span> Boolean [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_46"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>).</li><li>If <var>subject</var> <emu-xref href="#sec-ecmascript-language-types-boolean-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-boolean-type">is not a Boolean</a></emu-xref> and does not have a <var class="field">[[BooleanData]]</var> internal slot, return <emu-val>false</emu-val>.</li><li>If <var>hint</var> is <emu-val>"boolean"</emu-val>, return <emu-val>true</emu-val>.</li><li>If <var>subject</var> <emu-xref href="#sec-ecmascript-language-types-boolean-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-boolean-type">is a Boolean</a></emu-xref>, return <emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(« <var>subject</var>&nbsp;»).</li><li>Return <emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(« <var>subject</var>.<var class="field">[[BooleanData]]</var>&nbsp;»).</li></ol></emu-alg>
       </emu-clause>
@@ -739,12 +758,12 @@ <h1><span class="secnum">20.4.2</span> Properties of the Symbol Constructor</h1>
 
       <emu-clause id="sec-symbol.custommatcher" number="17">
         <h1><span class="secnum">20.4.2.17</span> Symbol.customMatcher</h1>
-        <p>The initial value of <code>Symbol.customMatcher</code> is the well-known symbol <emu-xref href="#sec-well-known-symbols" id="_ref_47"><a href="#sec-well-known-symbols">@@customMatcher</a></emu-xref> (<emu-xref href="#table-well-known-symbols"><a href="https://tc39.es/ecma262/#table-well-known-symbols">Table 1</a></emu-xref>).</p>
+        <p>The initial value of <code>Symbol.customMatcher</code> is the well-known symbol <emu-xref href="#sec-well-known-symbols" id="_ref_47"><a href="#sec-well-known-symbols">%Symbol.customMatcher%</a></emu-xref> (<emu-xref href="#table-well-known-symbols"><a href="https://tc39.es/ecma262/#table-well-known-symbols">Table 1</a></emu-xref>).</p>
         <p>This property has the attributes { <var class="field">[[Writable]]</var>: <emu-val>false</emu-val>, <var class="field">[[Enumerable]]</var>: <emu-val>false</emu-val>, <var class="field">[[Configurable]]</var>: <emu-val>false</emu-val> }.</p>
       </emu-clause>
 
-      <emu-clause id="sec-symbol-@@custommatcher">
-        <h1><span class="secnum">20.4.2.18</span> Symbol [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-symbol-%symbol.custommatcher%">
+        <h1><span class="secnum">20.4.2.18</span> Symbol [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_48"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>).</li><li>If <var>subject</var> <emu-xref href="#sec-ecmascript-language-types-symbol-type" id="_ref_49"><a href="#sec-ecmascript-language-types-symbol-type">is not a Symbol</a></emu-xref> and does not have a <var class="field">[[SymbolData]]</var> internal slot, return <emu-val>false</emu-val>.</li><li>If <var>hint</var> is <emu-val>"boolean"</emu-val>, return <emu-val>true</emu-val>.</li><li>If <var>subject</var> <emu-xref href="#sec-ecmascript-language-types-symbol-type" id="_ref_50"><a href="#sec-ecmascript-language-types-symbol-type">is a Symbol</a></emu-xref>, return <emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(« <var>subject</var>&nbsp;»).</li><li>Return <emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(« <var>subject</var>.<var class="field">[[SymbolData]]</var>&nbsp;»).</li></ol></emu-alg>
       </emu-clause>
@@ -770,8 +789,8 @@ <h1><span class="secnum">20.5.1.1</span> Error ( <var>message</var> [ , <var>opt
     <emu-clause id="sec-properties-of-the-error-constructors" number="2">
       <h1><span class="secnum">20.5.2</span> Properties of the Error Constructor</h1>
 
-      <emu-clause id="sec-error-@@custommatcher" number="2">
-          <h1><span class="secnum">20.5.2.2</span> Error [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-error-%symbol.custommatcher%" number="2">
+        <h1><span class="secnum">20.5.2.2</span> Error [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
           <p>This function performs the following steps when called:</p>
           <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_51"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>, <emu-const>boolean</emu-const>).</li><li>If <var>subject</var> does not have a <var class="field">[[ErrorData]]</var> internal slot, return <emu-val>false</emu-val>.</li><li>Return <emu-val>true</emu-val>.</li></ol></emu-alg>
       </emu-clause>
@@ -783,7 +802,10 @@ <h1><span class="secnum">20.5.2.2</span> Error [ @@customMatcher ] ( <var>subjec
 
     <emu-clause id="sec-properties-of-error-instances" number="4">
       <h1><span class="secnum">20.5.4</span> Properties of Error Instances</h1>
-      <p>Error instances are <emu-xref href="#ordinary-object"><a href="https://tc39.es/ecma262/#ordinary-object">ordinary objects</a></emu-xref> that inherit properties from the <emu-xref href="#sec-properties-of-the-error-prototype-object"><a href="https://tc39.es/ecma262/#sec-properties-of-the-error-prototype-object">Error prototype object</a></emu-xref> and have an <var class="field">[[ErrorData]]</var> internal slot whose value is <del><emu-val>undefined</emu-val></del> <ins>a String</ins>. The only specified uses of <var class="field">[[ErrorData]]</var> is to identify Error, AggregateError, and <var>NativeError</var> instances as Error objects within <code>Object.prototype.toString</code> <ins>and their <emu-xref href="#sec-well-known-symbols" id="_ref_52"><a href="#sec-well-known-symbols">@@customMatcher</a></emu-xref> methods</ins>.</p>
+      <p>Error instances are <emu-xref href="#ordinary-object"><a href="https://tc39.es/ecma262/#ordinary-object">ordinary objects</a></emu-xref> that inherit properties from the <emu-xref href="#sec-properties-of-the-error-prototype-object"><a href="https://tc39.es/ecma262/#sec-properties-of-the-error-prototype-object">Error prototype object</a></emu-xref> and have an
+        <var class="field">[[ErrorData]]</var> internal slot whose value is <del><emu-val>undefined</emu-val></del> <ins>a String</ins>. The only specified uses of
+        <var class="field">[[ErrorData]]</var> is to identify Error, AggregateError, and <var>NativeError</var> instances as Error objects within
+        <code>Object.prototype.toString</code> <ins>and their <emu-xref href="#sec-well-known-symbols" id="_ref_52"><a href="#sec-well-known-symbols">%Symbol.customMatcher%</a></emu-xref> methods</ins>.</p>
       <emu-note type="editor"><span class="note">Editor's Note</span><div class="note-contents">
         Rename this internal slot to <var class="field">[[ErrorKind]]</var>.
       </div></emu-note>
@@ -805,15 +827,19 @@ <h1><span class="secnum">20.5.6.1.1</span> <var>NativeError</var> ( <var>message
       <emu-clause id="sec-properties-of-the-nativeerror-constructors" number="2">
         <h1><span class="secnum">20.5.6.2</span> Properties of the <var>NativeError</var> Constructors</h1>
 
-        <emu-clause id="sec-nativeerror-@@custommatcher" number="2">
-          <h1><span class="secnum">20.5.6.2.2</span> <var>NativeError</var> [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+        <emu-clause id="sec-nativeerror-%symbol.custommatcher%" number="2">
+          <h1><span class="secnum">20.5.6.2.2</span> <var>NativeError</var> [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
           <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_53"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>, <emu-const>boolean</emu-const>).</li><li>If <var>subject</var> does not have a <var class="field">[[ErrorData]]</var> internal slot or <var>subject</var>.<var class="field">[[ErrorData]]</var> is not <var>NativeError</var>, return <emu-val>false</emu-val>.</li><li>Return <emu-val>true</emu-val>.</li></ol></emu-alg>
         </emu-clause>
       </emu-clause>
 
       <emu-clause id="sec-properties-of-nativeerror-instances" number="4">
         <h1><span class="secnum">20.5.6.4</span> Properties of <var>NativeError</var> Instances</h1>
-        <p><var>NativeError</var> instances are <emu-xref href="#ordinary-object"><a href="https://tc39.es/ecma262/#ordinary-object">ordinary objects</a></emu-xref> that inherit properties from their <var>NativeError</var> prototype object and have an <var class="field">[[ErrorData]]</var> internal slot whose value is <del><emu-val>undefined</emu-val></del> <ins>a String</ins>. The only specified use of <var class="field">[[ErrorData]]</var> is by <code>Object.prototype.toString</code> (<emu-xref href="#sec-object.prototype.tostring"><a href="https://tc39.es/ecma262/#sec-object.prototype.tostring">20.1.3.6</a></emu-xref>) <ins>and their <emu-xref href="#sec-well-known-symbols" id="_ref_54"><a href="#sec-well-known-symbols">@@customMatcher</a></emu-xref> methods</ins> to identify Error, AggregateError, or <var>NativeError</var> instances.</p>
+        <p><var>NativeError</var> instances are <emu-xref href="#ordinary-object"><a href="https://tc39.es/ecma262/#ordinary-object">ordinary objects</a></emu-xref> that inherit properties from their <var>NativeError</var> prototype object and
+          have an <var class="field">[[ErrorData]]</var> internal slot whose value is <del><emu-val>undefined</emu-val></del> <ins>a String</ins>. The only specified use
+          of <var class="field">[[ErrorData]]</var> is by <code>Object.prototype.toString</code> (<emu-xref href="#sec-object.prototype.tostring"><a href="https://tc39.es/ecma262/#sec-object.prototype.tostring">20.1.3.6</a></emu-xref>)
+          <ins>and their <emu-xref href="#sec-well-known-symbols" id="_ref_54"><a href="#sec-well-known-symbols">%Symbol.customMatcher%</a></emu-xref> methods</ins> to identify Error, AggregateError, or <var>NativeError</var> instances.
+        </p>
       </emu-clause>
     </emu-clause>
 
@@ -833,15 +859,19 @@ <h1><span class="secnum">20.5.7.1.1</span> AggregateError ( <var>errors</var>, <
       <emu-clause id="sec-properties-of-the-aggregate-error-constructors" number="2">
         <h1><span class="secnum">20.5.7.2</span> Properties of the AggregateError Constructor</h1>
 
-        <emu-clause id="sec-aggregate-error-@@custommatcher" number="2">
-          <h1><span class="secnum">20.5.7.2.2</span> AggregateError [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+        <emu-clause id="sec-aggregate-error-%symbol.custommatcher%" number="2">
+          <h1><span class="secnum">20.5.7.2.2</span> AggregateError [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
           <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_55"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>, <emu-const>boolean</emu-const>).</li><li>If <var>subject</var> does not have a <var class="field">[[ErrorData]]</var> internal slot or <var>subject</var>.<var class="field">[[ErrorData]]</var> is not <emu-val>"AggregateError"</emu-val>, return <emu-val>false</emu-val>.</li><li>Return <emu-val>true</emu-val>.</li></ol></emu-alg>
         </emu-clause>
       </emu-clause>
 
       <emu-clause id="sec-properties-of-aggregate-error-instances" number="4">
         <h1><span class="secnum">20.5.7.4</span> Properties of AggregateError Instances</h1>
-        <p>AggregateError instances are <emu-xref href="#ordinary-object"><a href="https://tc39.es/ecma262/#ordinary-object">ordinary objects</a></emu-xref> that inherit properties from their <emu-xref href="#sec-properties-of-the-aggregate-error-prototype-objects"><a href="https://tc39.es/ecma262/#sec-properties-of-the-aggregate-error-prototype-objects">AggregateError prototype object</a></emu-xref> and have an <var class="field">[[ErrorData]]</var> internal slot whose value is <del><emu-val>undefined</emu-val></del> <ins>a String</ins>. The only specified use of <var class="field">[[ErrorData]]</var> is by <code>Object.prototype.toString</code> (<emu-xref href="#sec-object.prototype.tostring"><a href="https://tc39.es/ecma262/#sec-object.prototype.tostring">20.1.3.6</a></emu-xref>) <ins>and their <emu-xref href="#sec-well-known-symbols" id="_ref_56"><a href="#sec-well-known-symbols">@@customMatcher</a></emu-xref> methods</ins> to identify Error, AggregateError, or <var>NativeError</var> instances.</p>
+        <p>AggregateError instances are <emu-xref href="#ordinary-object"><a href="https://tc39.es/ecma262/#ordinary-object">ordinary objects</a></emu-xref> that inherit properties from their <emu-xref href="#sec-properties-of-the-aggregate-error-prototype-objects"><a href="https://tc39.es/ecma262/#sec-properties-of-the-aggregate-error-prototype-objects">AggregateError prototype object</a></emu-xref> and
+          have an <var class="field">[[ErrorData]]</var> internal slot whose value is <del><emu-val>undefined</emu-val></del> <ins>a String</ins>. The only specified use
+          of <var class="field">[[ErrorData]]</var> is by <code>Object.prototype.toString</code> (<emu-xref href="#sec-object.prototype.tostring"><a href="https://tc39.es/ecma262/#sec-object.prototype.tostring">20.1.3.6</a></emu-xref>)
+          <ins>and their <emu-xref href="#sec-well-known-symbols" id="_ref_56"><a href="#sec-well-known-symbols">%Symbol.customMatcher%</a></emu-xref> methods</ins> to identify Error, AggregateError, or <var>NativeError</var> instances.
+        </p>
       </emu-clause>
     </emu-clause>
   </emu-clause>
@@ -856,8 +886,8 @@ <h1><span class="secnum">21.1</span> Number Objects</h1>
     <emu-clause id="sec-properties-of-the-number-constructor" number="2">
       <h1><span class="secnum">21.1.2</span> Properties of the Number Constructor</h1>
 
-      <emu-clause id="sec-number-@@custommatcher" number="16">
-        <h1><span class="secnum">21.1.2.16</span> Number [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-number-%symbol.custommatcher%" number="16">
+        <h1><span class="secnum">21.1.2.16</span> Number [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_57"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>).</li><li>If <var>subject</var> <emu-xref href="#sec-ecmascript-language-types-number-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-number-type">is not a Number</a></emu-xref> and does not have a <var class="field">[[NumberData]]</var> internal slot, return <emu-val>false</emu-val>.</li><li>If <var>hint</var> is <emu-val>"boolean"</emu-val>, return <emu-val>true</emu-val>.</li><li>If <var>subject</var> <emu-xref href="#sec-ecmascript-language-types-number-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-number-type">is a Number</a></emu-xref>, return <emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(« <var>subject</var>&nbsp;»).</li><li>Return <emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(« <var>subject</var>.<var class="field">[[NumberData]]</var>&nbsp;»).</li></ol></emu-alg>
       </emu-clause>
@@ -873,8 +903,8 @@ <h1><span class="secnum">21.2</span> BigInt Objects</h1>
     <emu-clause id="sec-properties-of-the-bigint-constructor" number="2">
       <h1><span class="secnum">21.2.2</span> Properties of the BigInt Constructor</h1>
 
-      <emu-clause id="sec-bigint-@@custommatcher" number="4">
-        <h1><span class="secnum">21.2.2.4</span> BigInt [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-bigint-%symbol.custommatcher%" number="4">
+        <h1><span class="secnum">21.2.2.4</span> BigInt [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_58"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>).</li><li>If <var>subject</var> <emu-xref href="#sec-ecmascript-language-types-bigint-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-bigint-type">is not a BigInt</a></emu-xref> and does not have a <var class="field">[[BigIntData]]</var> internal slot, return <emu-val>false</emu-val>.</li><li>If <var>hint</var> is <emu-val>"boolean"</emu-val>, return <emu-val>true</emu-val>.</li><li>If <var>subject</var> <emu-xref href="#sec-ecmascript-language-types-bigint-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-bigint-type">is a BigInt</a></emu-xref>, return <emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(« <var>subject</var>&nbsp;»).</li><li>Return <emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(« <var>subject</var>.<var class="field">[[BigIntData]]</var>&nbsp;»).</li></ol></emu-alg>
       </emu-clause>
@@ -890,8 +920,8 @@ <h1><span class="secnum">21.4</span> Date Objects</h1>
     <emu-clause id="sec-properties-of-the-date-constructor" number="3">
       <h1><span class="secnum">21.4.3</span> Properties of the Date Constructor</h1>
 
-      <emu-clause id="sec-date-@@custommatcher" number="5">
-        <h1><span class="secnum">21.4.3.5</span> Date [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-date-%symbol.custommatcher%" number="5">
+        <h1><span class="secnum">21.4.3.5</span> Date [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_59"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>, <emu-const>boolean</emu-const>).</li><li>If <var>subject</var> does not have a <var class="field">[[DateValue]]</var> internal slot, return <emu-val>false</emu-val>.</li><li>Return <emu-val>true</emu-val>.</li></ol></emu-alg>
       </emu-clause>
@@ -908,8 +938,8 @@ <h1><span class="secnum">22.1</span> String Objects</h1>
     <emu-clause id="sec-properties-of-the-string-constructor" number="2">
       <h1><span class="secnum">22.1.2</span> Properties of the String Constructor</h1>
 
-      <emu-clause id="sec-string-@@custommatcher" number="5">
-        <h1><span class="secnum">22.1.2.5</span> String [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-string-%symbol.custommatcher%" number="5">
+        <h1><span class="secnum">22.1.2.5</span> String [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_60"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>).</li><li>If <var>subject</var> <emu-xref href="#sec-ecmascript-language-types-string-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-string-type">is not a String</a></emu-xref> and does not have a <var class="field">[[StringData]]</var> internal slot, return <emu-val>false</emu-val>.</li><li>If <var>hint</var> is <emu-val>"boolean"</emu-val>, return <emu-val>true</emu-val>.</li><li>If <var>subject</var> <emu-xref href="#sec-ecmascript-language-types-string-type"><a href="https://tc39.es/ecma262/#sec-ecmascript-language-types-string-type">is a String</a></emu-xref>, return <emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(« <var>subject</var>&nbsp;»).</li><li>Return <emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(« <var>subject</var>.<var class="field">[[StringData]]</var>&nbsp;»).</li></ol></emu-alg>
       </emu-clause>
@@ -1146,12 +1176,12 @@ <h1><span class="secnum">22.2.4.1</span> RegExp ( <var>pattern</var>, <var>flags
     <emu-clause id="sec-properties-of-the-regexp-constructor" number="5">
       <h1><span class="secnum">22.2.5</span> Properties of the RegExp Constructor</h1>
 
-      <emu-clause id="sec-regexp-@@custommatcher" number="3">
-        <h1><span class="secnum">22.2.5.3</span> RegExp [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-regexp-%symbol.custommatcher%" number="3">
+        <h1><span class="secnum">22.2.5.3</span> RegExp [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_71"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>, <emu-const>boolean</emu-const>).</li><li>If ?&nbsp;<emu-xref aoid="IsRegExp"><a href="https://tc39.es/ecma262/#sec-isregexp" class="e-user-code">IsRegExp</a></emu-xref>(<var>subject</var>) is <emu-val>false</emu-val>, return <emu-val>false</emu-val>.</li><li>Return <emu-val>true</emu-val>.</li></ol></emu-alg>
         <emu-note><span class="note">Note</span><div class="note-contents">
-          <emu-xref aoid="IsRegExp"><a href="https://tc39.es/ecma262/#sec-isregexp">IsRegExp</a></emu-xref> returns <emu-val>true</emu-val> for objects that have a truthy <emu-xref href="#sec-well-known-symbols" id="_ref_72"><a href="#sec-well-known-symbols">@@match</a></emu-xref> property. Do we want this?
+          <emu-xref aoid="IsRegExp"><a href="https://tc39.es/ecma262/#sec-isregexp">IsRegExp</a></emu-xref> returns <emu-val>true</emu-val> for objects that have a truthy <emu-xref href="#sec-well-known-symbols" id="_ref_72"><a href="#sec-well-known-symbols">%Symbol.match%</a></emu-xref> property. Do we want this?
         </div></emu-note>
       </emu-clause>
     </emu-clause>
@@ -1159,24 +1189,24 @@ <h1><span class="secnum">22.2.5.3</span> RegExp [ @@customMatcher ] ( <var>subje
     <emu-clause id="sec-properties-of-the-regexp-prototype-object" number="6">
       <h1><span class="secnum">22.2.6</span> Properties of the RegExp Prototype Object</h1>
 
-      <emu-clause id="sec-regexp.prototype-@@custommatcher" number="20">
-        <h1><span class="secnum">22.2.6.20</span> RegExp.prototype [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-regexp.prototype-%symbol.custommatcher%" number="20">
+        <h1><span class="secnum">22.2.6.20</span> RegExp.prototype [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
-        <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_73"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>).</li><li>Let <var>regexp</var> be <emu-val>this</emu-val> value.</li><li>If <var>hint</var> is <emu-val>"boolean"</emu-val>, return ?&nbsp;<emu-xref aoid="Call"><a href="https://tc39.es/ecma262/#sec-call" class="e-user-code">Call</a></emu-xref>(? <emu-xref aoid="Get"><a href="https://tc39.es/ecma262/#sec-get-o-p" class="e-user-code">Get</a></emu-xref>(<var>regexp</var>, <emu-val>"test"</emu-val>), <var>regexp</var>, « <var>subject</var>&nbsp;»).</li><li>Let <var>isRegExp</var> be ?&nbsp;<emu-xref aoid="IsRegExp"><a href="https://tc39.es/ecma262/#sec-isregexp" class="e-user-code">IsRegExp</a></emu-xref>(<var>regexp</var>).</li><li>If <var>isRegExp</var> is <emu-val>true</emu-val>, then<ol><li>Let <var>flags</var> be ?&nbsp;<emu-xref aoid="Get"><a href="https://tc39.es/ecma262/#sec-get-o-p" class="e-user-code">Get</a></emu-xref>(<var>regexp</var>, "flags").</li><li>Perform ?&nbsp;<emu-xref aoid="RequireObjectCoercible"><a href="https://tc39.es/ecma262/#sec-requireobjectcoercible">RequireObjectCoercible</a></emu-xref>(<var>flags</var>).</li><li>If ?&nbsp;<emu-xref aoid="ToString"><a href="https://tc39.es/ecma262/#sec-tostring" class="e-user-code">ToString</a></emu-xref>(<var>flags</var>) contains <emu-val>g</emu-val>, then<ol><li>Let <var>iterator</var> be ?&nbsp;<emu-xref aoid="Call"><a href="https://tc39.es/ecma262/#sec-call" class="e-user-code">Call</a></emu-xref>(? <emu-xref aoid="Get"><a href="https://tc39.es/ecma262/#sec-get-o-p" class="e-user-code">Get</a></emu-xref>(<var>regexp</var>, <emu-xref href="#sec-well-known-symbols" id="_ref_74"><a href="#sec-well-known-symbols">@@matchAll</a></emu-xref>), <var>regexp</var>, « <var>subject</var>&nbsp;»).</li><li>Let <var>array</var> be ?&nbsp;<emu-xref aoid="Call"><a href="https://tc39.es/ecma262/#sec-call" class="e-user-code">Call</a></emu-xref>(<emu-xref href="#sec-array.from"><a href="https://tc39.es/ecma262/#sec-array.from">%Array.from%</a></emu-xref>, <emu-xref href="#sec-array-constructor"><a href="https://tc39.es/ecma262/#sec-array-constructor">%Array%</a></emu-xref>, « <var>iterator</var>&nbsp;»).</li><li>If !&nbsp;<emu-xref aoid="LengthOfArrayLike"><a href="https://tc39.es/ecma262/#sec-lengthofarraylike">LengthOfArrayLike</a></emu-xref>(<var>array</var>) is 0, return <emu-val>false</emu-val>.</li><li>Return <var>array</var>.</li></ol></li></ol></li><li>Let <var>result</var> be ?&nbsp;<emu-xref aoid="Call"><a href="https://tc39.es/ecma262/#sec-call" class="e-user-code">Call</a></emu-xref>(? <emu-xref aoid="Get"><a href="https://tc39.es/ecma262/#sec-get-o-p" class="e-user-code">Get</a></emu-xref>(<var>regexp</var>, <emu-xref href="#sec-well-known-symbols" id="_ref_75"><a href="#sec-well-known-symbols">@@match</a></emu-xref>), <var>regexp</var>, « <var>subject</var>&nbsp;»).</li><li>If <var>result</var> is <emu-val>null</emu-val>, return <emu-val>false</emu-val>.</li><li>Return <emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(« <var>result</var>&nbsp;»).</li></ol></emu-alg>
+        <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_73"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>).</li><li>Let <var>regexp</var> be <emu-val>this</emu-val> value.</li><li>If <var>hint</var> is <emu-val>"boolean"</emu-val>, return ?&nbsp;<emu-xref aoid="Call"><a href="https://tc39.es/ecma262/#sec-call" class="e-user-code">Call</a></emu-xref>(? <emu-xref aoid="Get"><a href="https://tc39.es/ecma262/#sec-get-o-p" class="e-user-code">Get</a></emu-xref>(<var>regexp</var>, <emu-val>"test"</emu-val>), <var>regexp</var>, « <var>subject</var>&nbsp;»).</li><li>Let <var>isRegExp</var> be ?&nbsp;<emu-xref aoid="IsRegExp"><a href="https://tc39.es/ecma262/#sec-isregexp" class="e-user-code">IsRegExp</a></emu-xref>(<var>regexp</var>).</li><li>If <var>isRegExp</var> is <emu-val>true</emu-val>, then<ol><li>Let <var>flags</var> be ?&nbsp;<emu-xref aoid="Get"><a href="https://tc39.es/ecma262/#sec-get-o-p" class="e-user-code">Get</a></emu-xref>(<var>regexp</var>, "flags").</li><li>Perform ?&nbsp;<emu-xref aoid="RequireObjectCoercible"><a href="https://tc39.es/ecma262/#sec-requireobjectcoercible">RequireObjectCoercible</a></emu-xref>(<var>flags</var>).</li><li>If ?&nbsp;<emu-xref aoid="ToString"><a href="https://tc39.es/ecma262/#sec-tostring" class="e-user-code">ToString</a></emu-xref>(<var>flags</var>) contains <emu-val>g</emu-val>, then<ol><li>Let <var>iterator</var> be ?&nbsp;<emu-xref aoid="Call"><a href="https://tc39.es/ecma262/#sec-call" class="e-user-code">Call</a></emu-xref>(? <emu-xref aoid="Get"><a href="https://tc39.es/ecma262/#sec-get-o-p" class="e-user-code">Get</a></emu-xref>(<var>regexp</var>, <emu-xref href="#sec-well-known-symbols" id="_ref_74"><a href="#sec-well-known-symbols">%Symbol.matchAll%</a></emu-xref>), <var>regexp</var>, « <var>subject</var>&nbsp;»).</li><li>Let <var>array</var> be ?&nbsp;<emu-xref aoid="Call"><a href="https://tc39.es/ecma262/#sec-call" class="e-user-code">Call</a></emu-xref>(<emu-xref href="#sec-array.from"><a href="https://tc39.es/ecma262/#sec-array.from">%Array.from%</a></emu-xref>, <emu-xref href="#sec-array-constructor"><a href="https://tc39.es/ecma262/#sec-array-constructor">%Array%</a></emu-xref>, « <var>iterator</var>&nbsp;»).</li><li>If !&nbsp;<emu-xref aoid="LengthOfArrayLike"><a href="https://tc39.es/ecma262/#sec-lengthofarraylike">LengthOfArrayLike</a></emu-xref>(<var>array</var>) is 0, return <emu-val>false</emu-val>.</li><li>Return <var>array</var>.</li></ol></li></ol></li><li>Let <var>result</var> be ?&nbsp;<emu-xref aoid="Call"><a href="https://tc39.es/ecma262/#sec-call" class="e-user-code">Call</a></emu-xref>(? <emu-xref aoid="Get"><a href="https://tc39.es/ecma262/#sec-get-o-p" class="e-user-code">Get</a></emu-xref>(<var>regexp</var>, <emu-xref href="#sec-well-known-symbols" id="_ref_75"><a href="#sec-well-known-symbols">%Symbol.match%</a></emu-xref>), <var>regexp</var>, « <var>subject</var>&nbsp;»).</li><li>If <var>result</var> is <emu-val>null</emu-val>, return <emu-val>false</emu-val>.</li><li>Return <emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(« <var>result</var>&nbsp;»).</li></ol></emu-alg>
         <emu-note code=""><span class="note">Note</span><div class="note-contents">
           <pre><code class="javascript hljs"><span class="hljs-keyword">let</span> regex = <span class="hljs-regexp">/(?&lt;id&gt;\d+)-?/g</span>
 <span class="hljs-string">'012-345'</span> is <span class="hljs-title function_">regex</span>([<span class="hljs-string">"012-"</span>, <span class="hljs-string">"012"</span>], { <span class="hljs-attr">groups</span>: { <span class="hljs-attr">id</span>: <span class="hljs-string">"345"</span> } });
-<span class="hljs-comment">// true, match with @@matchAll</span>
+<span class="hljs-comment">// true, match with %Symbol.matchAll%</span>
 
 <span class="hljs-keyword">let</span> regex2 = <span class="hljs-regexp">/(?&lt;id&gt;\d+)-?/</span>
 <span class="hljs-string">'012-345'</span> is <span class="hljs-title function_">regex</span>({ <span class="hljs-attr">groups</span>: { <span class="hljs-attr">id</span>: <span class="hljs-string">"012"</span> } });
-<span class="hljs-comment">// true, match with @@match</span></code></pre>
+<span class="hljs-comment">// true, match with %Symbol.match%</span></code></pre>
         </div></emu-note>
         <emu-note type="editor"><span class="note">Editor's Note</span><div class="note-contents">
           The <emu-val>"flags"</emu-val> property in this algorithm is accessed twice, this is not ideal.
           Another access is
-          in <emu-xref href="#sec-regexp-prototype-matchall" title=""><a href="https://tc39.es/ecma262/#sec-regexp-prototype-matchall">RegExp.prototype [ @@matchAll ] ( <var>string</var> )</a></emu-xref>
-          or <emu-xref href="#sec-regexp.prototype-@@match" title=""><a href="https://tc39.es/ecma262/#sec-regexp.prototype-@@match">RegExp.prototype [ @@match ] ( <var>string</var> )</a></emu-xref>
+          in <emu-xref href="#sec-regexp-prototype-%symbol.matchall%" title=""><a href="https://tc39.es/ecma262/#sec-regexp-prototype-%symbol.matchall%">RegExp.prototype [ %Symbol.matchAll% ] ( <var>string</var> )</a></emu-xref>
+          or <emu-xref href="#sec-regexp.prototype-%symbol.match%" title=""><a href="https://tc39.es/ecma262/#sec-regexp.prototype-%symbol.match%">RegExp.prototype [ %Symbol.match% ] ( <var>string</var> )</a></emu-xref>
           depends on if the <var>regexp</var> has the <emu-val>g</emu-val> flag.
         </div></emu-note>
         <emu-note type="editor"><span class="note">Editor's Note</span><div class="note-contents">
@@ -1199,8 +1229,8 @@ <h1><span class="secnum">23.1</span> Array Objects</h1>
     <emu-clause id="sec-properties-of-the-array-constructor" number="2">
       <h1><span class="secnum">23.1.2</span> Properties of the Array Constructor</h1>
 
-      <emu-clause id="sec-array-@@custommatcher" number="6">
-        <h1><span class="secnum">23.1.2.6</span> Array [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-array-%symbol.custommatcher%" number="6">
+        <h1><span class="secnum">23.1.2.6</span> Array [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_76"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>).</li><li>If ?&nbsp;<emu-xref aoid="IsArray"><a href="https://tc39.es/ecma262/#sec-isarray">IsArray</a></emu-xref>(<var>subject</var>) is <emu-val>false</emu-val>, return <emu-val>false</emu-val>.</li><li>If <var>hint</var> is <emu-val>"boolean"</emu-val>, return <emu-val>true</emu-val>.</li><li>Return <var>subject</var>.</li></ol></emu-alg>
         <emu-note code=""><span class="note">Note</span><div class="note-contents"><pre><code class="javascript hljs"><span class="hljs-keyword">if</span> (expr is <span class="hljs-title class_">Array</span>(<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>, <span class="hljs-number">4</span>)) {}</code></pre></div></emu-note>
@@ -1214,8 +1244,8 @@ <h1><span class="secnum">23.2</span> TypedArray Objects</h1>
     <emu-clause id="sec-properties-of-the-typedarray-constructors" number="6">
       <h1><span class="secnum">23.2.6</span> Properties of the <var>TypedArray</var> Constructors</h1>
 
-      <emu-clause id="sec-_typedarray_-@@custommatcher" number="3">
-        <h1><span class="secnum">23.2.6.3</span> <var>TypedArray</var> [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-_typedarray_-%symbol.custommatcher%" number="3">
+        <h1><span class="secnum">23.2.6.3</span> <var>TypedArray</var> [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_77"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>).</li><li>If <var>subject</var> does not have a <var class="field">[[TypedArrayName]]</var> internal slot or <var>subject</var>.<var class="field">[[TypedArrayName]]</var> is not <var>TypedArray</var>, return <emu-val>false</emu-val>.</li><li>If <var>hint</var> is <emu-val>"boolean"</emu-val>, return <emu-val>true</emu-val>.</li><li>Return <var>subject</var>.</li></ol></emu-alg>
         <emu-note code=""><span class="note">Note</span><div class="note-contents"><pre><code class="javascript hljs"><span class="hljs-keyword">const</span> isPNG = binary is <span class="hljs-title class_">Uint</span>8<span class="hljs-built_in">Array</span>(
@@ -1236,8 +1266,8 @@ <h1><span class="secnum">24.1</span> Map Objects</h1>
     <emu-clause id="sec-properties-of-the-map-constructor" number="2">
       <h1><span class="secnum">24.1.2</span> Properties of the Map Constructor</h1>
 
-      <emu-clause id="sec-map-@@custommatcher" number="3">
-        <h1><span class="secnum">24.1.2.3</span> Map [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-map-%symbol.custommatcher%" number="3">
+        <h1><span class="secnum">24.1.2.3</span> Map [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_78"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>).</li><li>If <var>subject</var> does not have a <var class="field">[[MapData]]</var> internal slot, return <emu-val>false</emu-val>.</li><li>If <var>hint</var> is <emu-val>"boolean"</emu-val>, return <emu-val>true</emu-val>.</li><li>Return <emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(« <var>subject</var>&nbsp;»).</li></ol></emu-alg>
         <emu-note code=""><span class="note">Note</span><div class="note-contents"><pre><code class="javascript hljs">expr is <span class="hljs-title class_">Map</span>([[<span class="hljs-number">1</span>, <span class="hljs-number">2</span>], [<span class="hljs-number">3</span>, <span class="hljs-number">4</span>]]);
@@ -1256,8 +1286,8 @@ <h1><span class="secnum">24.2</span> Set Objects</h1>
     <emu-clause id="sec-properties-of-the-set-constructor" number="2">
       <h1><span class="secnum">24.2.2</span> Properties of the Set Constructor</h1>
 
-      <emu-clause id="sec-set-@@custommatcher" number="3">
-        <h1><span class="secnum">24.2.2.3</span> Set [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-set-%symbol.custommatcher%" number="3">
+        <h1><span class="secnum">24.2.2.3</span> Set [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_79"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>).</li><li>If <var>subject</var> does not have a <var class="field">[[SetData]]</var> internal slot, return <emu-val>false</emu-val>.</li><li>If <var>hint</var> is <emu-val>"boolean"</emu-val>, return <emu-val>true</emu-val>.</li><li>Return <emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(« <var>subject</var>&nbsp;»).</li></ol></emu-alg>
         <emu-note code=""><span class="note">Note</span><div class="note-contents"><pre><code class="javascript hljs">expr is <span class="hljs-title class_">Set</span>([<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>]);
@@ -1276,8 +1306,8 @@ <h1><span class="secnum">24.3</span> WeakMap Objects</h1>
     <emu-clause id="sec-properties-of-the-weakmap-constructor" number="2">
       <h1><span class="secnum">24.3.2</span> Properties of the WeakMap Constructor</h1>
 
-      <emu-clause id="sec-weakmap-@@custommatcher" number="2">
-        <h1><span class="secnum">24.3.2.2</span> WeakMap [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-weakmap-%symbol.custommatcher%" number="2">
+        <h1><span class="secnum">24.3.2.2</span> WeakMap [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_80"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>, <emu-const>boolean</emu-const>).</li><li>If <var>subject</var> does not have a <var class="field">[[WeakMapData]]</var> internal slot, return <emu-val>false</emu-val>.</li><li>Return <emu-val>true</emu-val>.</li></ol></emu-alg>
       </emu-clause>
@@ -1290,8 +1320,8 @@ <h1><span class="secnum">24.4</span> WeakSet Objects</h1>
     <emu-clause id="sec-properties-of-the-weakset-constructor" number="2">
       <h1><span class="secnum">24.4.2</span> Properties of the WeakSet Constructor</h1>
 
-      <emu-clause id="sec-weakset-@@custommatcher" number="2">
-        <h1><span class="secnum">24.4.2.2</span> WeakSet [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-weakset-%symbol.custommatcher%" number="2">
+        <h1><span class="secnum">24.4.2.2</span> WeakSet [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_81"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>, <emu-const>boolean</emu-const>).</li><li>If <var>subject</var> does not have a <var class="field">[[WeakSetData]]</var> internal slot, return <emu-val>false</emu-val>.</li><li>Return <emu-val>true</emu-val>.</li></ol></emu-alg>
       </emu-clause>
@@ -1308,8 +1338,8 @@ <h1><span class="secnum">25.1</span> ArrayBuffer Objects</h1>
     <emu-clause id="sec-properties-of-the-arraybuffer-constructor" number="5">
       <h1><span class="secnum">25.1.5</span> Properties of the ArrayBuffer Constructor</h1>
 
-      <emu-clause id="sec-arraybuffer-@@custommatcher" number="4">
-        <h1><span class="secnum">25.1.5.4</span> ArrayBuffer [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-arraybuffer-%symbol.custommatcher%" number="4">
+        <h1><span class="secnum">25.1.5.4</span> ArrayBuffer [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_82"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>, <emu-const>boolean</emu-const>).</li><li>If <var>subject</var> has a <var class="field">[[ArrayBufferData]]</var> internal slot, return <emu-val>true</emu-val>.</li><li>Return <emu-val>false</emu-val>.</li></ol></emu-alg>
       </emu-clause>
@@ -1322,8 +1352,8 @@ <h1><span class="secnum">25.2</span> SharedArrayBuffer Objects</h1>
     <emu-clause id="sec-properties-of-the-sharedarraybuffer-constructor" number="4">
       <h1><span class="secnum">25.2.4</span> Properties of the SharedArrayBuffer Constructor</h1>
 
-      <emu-clause id="sec-sharedarraybuffer-@@custommatcher" number="3">
-        <h1><span class="secnum">25.2.4.3</span> SharedArrayBuffer [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-sharedarraybuffer-%symbol.custommatcher%" number="3">
+        <h1><span class="secnum">25.2.4.3</span> SharedArrayBuffer [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_83"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>, <emu-const>boolean</emu-const>).</li><li>If <var>subject</var> does not have a <var class="field">[[ArrayBufferData]]</var> internal slot, return <emu-val>false</emu-val>.</li><li>Return <emu-xref aoid="IsSharedArrayBuffer"><a href="https://tc39.es/ecma262/#sec-issharedarraybuffer">IsSharedArrayBuffer</a></emu-xref>(<var>subject</var>).</li></ol></emu-alg>
       </emu-clause>
@@ -1336,8 +1366,8 @@ <h1><span class="secnum">25.3</span> DataView Objects</h1>
     <emu-clause id="sec-properties-of-the-dataview-constructor" number="3">
       <h1><span class="secnum">25.3.3</span> Properties of the DataView Constructor</h1>
 
-      <emu-clause id="sec-dataview-@@custommatcher" number="2">
-        <h1><span class="secnum">25.3.3.2</span> DataView [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-dataview-%symbol.custommatcher%" number="2">
+        <h1><span class="secnum">25.3.3.2</span> DataView [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_84"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>, <emu-const>boolean</emu-const>).</li><li>If <var>subject</var> does not have a <var class="field">[[DataView]]</var> internal slot, return <emu-val>false</emu-val>.</li><li>Return <emu-val>true</emu-val>.</li></ol></emu-alg>
       </emu-clause>
@@ -1354,8 +1384,8 @@ <h1><span class="secnum">26.1</span> WeakRef Objects</h1>
     <emu-clause id="sec-properties-of-the-weak-ref-constructor" number="2">
       <h1><span class="secnum">26.1.2</span> Properties of the WeakRef Constructor</h1>
 
-      <emu-clause id="sec-weakref-@@custommatcher" number="2">
-        <h1><span class="secnum">26.1.2.2</span> WeakRef [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-weakref-%symbol.custommatcher%" number="2">
+        <h1><span class="secnum">26.1.2.2</span> WeakRef [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_85"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>).</li><li>If <var>subject</var> does not have a <var class="field">[[WeakRefTarget]]</var> internal slot, return <emu-val>false</emu-val>.</li><li>If <var>hint</var> is <emu-val>"boolean"</emu-val>, return <emu-val>true</emu-val>.</li><li>Return <emu-xref aoid="CreateArrayFromList"><a href="https://tc39.es/ecma262/#sec-createarrayfromlist">CreateArrayFromList</a></emu-xref>(« <emu-xref aoid="WeakRefDeref"><a href="https://tc39.es/ecma262/#sec-weakrefderef">WeakRefDeref</a></emu-xref>(<var>subject</var>)&nbsp;»).</li></ol></emu-alg>
         <emu-note code=""><span class="note">Note</span><div class="note-contents"><pre><code class="javascript hljs"><span class="hljs-keyword">if</span> (expr is <span class="hljs-title class_">WeakRef</span>(<span class="hljs-keyword">let</span> object)) {}</code></pre></div></emu-note>
@@ -1369,8 +1399,8 @@ <h1><span class="secnum">26.2</span> FinalizationRegistry Objects</h1>
     <emu-clause id="sec-properties-of-the-finalization-registry-constructor" number="2">
       <h1><span class="secnum">26.2.2</span> Properties of the FinalizationRegistry Constructor</h1>
 
-      <emu-clause id="sec-finalizationregistry-@@custommatcher" number="2">
-        <h1><span class="secnum">26.2.2.2</span> FinalizationRegistry [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-finalizationregistry-%symbol.custommatcher%" number="2">
+        <h1><span class="secnum">26.2.2.2</span> FinalizationRegistry [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_86"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>, <emu-const>boolean</emu-const>).</li><li>If <var>subject</var> does not have a <var class="field">[[CleanupCallback]]</var> internal slot, return <emu-val>false</emu-val>.</li><li>Return <emu-val>true</emu-val>.</li></ol></emu-alg>
       </emu-clause>
@@ -1387,8 +1417,8 @@ <h1><span class="secnum">27.2</span> Promise Objects</h1>
     <emu-clause id="sec-properties-of-the-promise-constructor" number="4">
       <h1><span class="secnum">27.2.4</span> Properties of the Promise Constructor</h1>
 
-      <emu-clause id="sec-promise-@@custommatcher" number="9">
-        <h1><span class="secnum">27.2.4.9</span> Promise [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</h1>
+      <emu-clause id="sec-promise-%symbol.custommatcher%" number="9">
+        <h1><span class="secnum">27.2.4.9</span> Promise [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Perform ?&nbsp;<emu-xref aoid="ValidateCustomMatcherHint" id="_ref_87"><a href="#sec-validatecustommatcherhint">ValidateCustomMatcherHint</a></emu-xref>(<var>hint</var>, <emu-const>boolean</emu-const>).</li><li>Return <emu-xref aoid="IsPromise"><a href="https://tc39.es/ecma262/#sec-ispromise">IsPromise</a></emu-xref>(<var>subject</var>).</li></ol></emu-alg>
       </emu-clause>
@@ -1405,13 +1435,13 @@ <h1><span class="secnum">28.2</span> Proxy Objects</h1>
     <emu-clause id="sec-proxy-constructor" number="1">
       <h1><span class="secnum">28.2.1</span> The Proxy Constructor</h1>
 
-      <emu-clause id="sec-proxy-@@custommatcher" number="2">
-        <h1><span class="secnum">28.2.1.2</span> Proxy [ @@customMatcher ] ( )</h1>
+      <emu-clause id="sec-proxy-%symbol.custommatcher%" number="2">
+        <h1><span class="secnum">28.2.1.2</span> Proxy [ %Symbol.customMatcher% ] ( )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg><ol><li>Throw a <emu-val>TypeError</emu-val> exception.</li></ol></emu-alg>
       </emu-clause>
       <emu-note type="editor"><span class="note">Editor's Note</span><div class="note-contents">
-        <p>All built-in <emu-xref href="#constructor"><a href="https://tc39.es/ecma262/#constructor">constructors</a></emu-xref> have a <emu-xref href="#sec-well-known-symbols" id="_ref_88"><a href="#sec-well-known-symbols">@@customMatcher</a></emu-xref> method. This one is for design consistency.</p>
+        <p>All built-in <emu-xref href="#constructor"><a href="https://tc39.es/ecma262/#constructor">constructors</a></emu-xref> have a <emu-xref href="#sec-well-known-symbols" id="_ref_88"><a href="#sec-well-known-symbols">%Symbol.customMatcher%</a></emu-xref> method. This one is for design consistency.</p>
         <p>This is not a consensus in the champion group.</p>
       </div></emu-note>
     </emu-clause>
@@ -1982,7 +2012,7 @@ <h2>Syntax</h2>
 </emu-production>
 </emu-grammar>
       <p>
-        The recommended way to match a String is to use the <emu-xref href="#sec-string-@@custommatcher" title="" id="_ref_18"><a href="#sec-string-@@custommatcher">String [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></emu-xref>,
+        The recommended way to match a String is to use the <emu-xref href="#sec-string-%symbol.custommatcher%" title="" id="_ref_18"><a href="#sec-string-%symbol.custommatcher%">String [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></emu-xref>,
         but it can be replaced. This production adds the ability to do the unforgeable <code>typeof</code> test.
       </p>
       <pre><code class="javascript hljs"><span class="hljs-keyword">if</span> (expr is { <span class="hljs-attr">version</span>: <span class="hljs-number">2</span> or <span class="hljs-number">3</span>, <span class="hljs-attr">value</span>: <span class="hljs-title class_">String</span> }) {}
@@ -2449,11 +2479,12 @@ <h1><span class="secnum">30.1.6</span> Runtime Semantics: RegularExpressionPatte
 </emu-production>
 </emu-grammar>, then<ol><li>Let <var>iterator</var> be ?&nbsp;<emu-xref aoid="GetIteratorCached" id="_ref_116"><a href="#sec-get-iterator-cached" class="e-user-code">GetIteratorCached</a></emu-xref>(<var>resultArray</var>, <var>cacheGroup</var>).</li><li>Return ?&nbsp;<emu-xref aoid="ListPatternMatches" id="_ref_117"><a href="#sec-list-pattern-matches" class="e-user-code">ListPatternMatches</a></emu-xref> of <emu-nt id="_ref_432"><a href="#prod-MatchList">MatchList</a></emu-nt> with arguments <var>iterator</var> and <var>cacheGroup</var>.</li></ol></li><li>Return <emu-val>true</emu-val>.</li></ol></emu-alg>
       <emu-note type="editor" class="show-ao-annotations"><span class="note">Editor's Note</span><div class="note-contents">
-        <p>In order to create binding without triggering user code, we're not calling <emu-xref href="#sec-regexp.prototype-@@custommatcher" title="" id="_ref_19"><a href="#sec-regexp.prototype-@@custommatcher">RegExp.prototype [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></emu-xref> and making the behaviour unforgeable.</p>
-        <p>Contrast to call <emu-xref href="#sec-regexp.prototype-@@custommatcher" title="" id="_ref_20"><a href="#sec-regexp.prototype-@@custommatcher">RegExp.prototype [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></emu-xref> directly, this <emu-xref href="#sec-algorithm-conventions-syntax-directed-operations"><a href="https://tc39.es/ecma262/#sec-algorithm-conventions-syntax-directed-operations">syntax-directed operation</a></emu-xref> skipped the following user code:</p>
+        <p>In order to create binding without triggering user code, we're not calling <emu-xref href="#sec-regexp.prototype-%symbol.custommatcher%" title="" id="_ref_19"><a href="#sec-regexp.prototype-%symbol.custommatcher%">RegExp.prototype [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></emu-xref> and making the behaviour unforgeable.</p>
+        <p>Contrast to call <emu-xref href="#sec-regexp.prototype-%symbol.custommatcher%" title="" id="_ref_20"><a href="#sec-regexp.prototype-%symbol.custommatcher%">RegExp.prototype [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></emu-xref> directly, this
+          <emu-xref href="#sec-algorithm-conventions-syntax-directed-operations"><a href="https://tc39.es/ecma262/#sec-algorithm-conventions-syntax-directed-operations">syntax-directed operation</a></emu-xref> skipped the following user code:</p>
         <ul>
           <li>
-            <span class="e-user-code">get and call <emu-xref href="#sec-regexp.prototype-@@custommatcher" title="" id="_ref_21"><a href="#sec-regexp.prototype-@@custommatcher">RegExp.prototype [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></emu-xref></span>
+            <span class="e-user-code">get and call <emu-xref href="#sec-regexp.prototype-%symbol.custommatcher%" title="" id="_ref_21"><a href="#sec-regexp.prototype-%symbol.custommatcher%">RegExp.prototype [ %Symbol.customMatcher% ] ( <var>subject</var>, <var>hint</var> )</a></emu-xref></span>
             <ul>
               <li>
                 <span class="e-user-code">get and call <emu-xref href="#sec-regexp.prototype.test" title=""><a href="https://tc39.es/ecma262/#sec-regexp.prototype.test">RegExp.prototype.test ( <var>S</var> )</a></emu-xref></span>
@@ -2467,7 +2498,7 @@ <h1><span class="secnum">30.1.6</span> Runtime Semantics: RegularExpressionPatte
                 </ul>
               </li>
               <li>
-                <span class="e-user-code">get and call <emu-xref href="#sec-regexp.prototype-@@match" title=""><a href="https://tc39.es/ecma262/#sec-regexp.prototype-@@match">RegExp.prototype [ @@match ] ( <var>string</var> )</a></emu-xref></span>
+                <span class="e-user-code">get and call <emu-xref href="#sec-regexp.prototype-%symbol.match%" title=""><a href="https://tc39.es/ecma262/#sec-regexp.prototype-%symbol.match%">RegExp.prototype [ %Symbol.match% ] ( <var>string</var> )</a></emu-xref></span>
                 <ul>
                   <li><span class="e-user-code">get <emu-xref href="#sec-get-regexp.prototype.flags" title=""><a href="https://tc39.es/ecma262/#sec-get-regexp.prototype.flags">get RegExp.prototype.flags</a></emu-xref></span></li>
                   <li>
@@ -2479,13 +2510,13 @@ <h1><span class="secnum">30.1.6</span> Runtime Semantics: RegularExpressionPatte
                 </ul>
               </li>
               <li>
-                <span class="e-user-code">get and call <emu-xref href="#sec-regexp-prototype-matchall" title=""><a href="https://tc39.es/ecma262/#sec-regexp-prototype-matchall">RegExp.prototype [ @@matchAll ] ( <var>string</var> )</a></emu-xref></span>
+                <span class="e-user-code">get and call <emu-xref href="#sec-regexp-prototype-%symbol.matchall%" title=""><a href="https://tc39.es/ecma262/#sec-regexp-prototype-%symbol.matchall%">RegExp.prototype [ %Symbol.matchAll% ] ( <var>string</var> )</a></emu-xref></span>
                 <ul>
                   <li>
                     <emu-xref aoid="SpeciesConstructor"><a href="https://tc39.es/ecma262/#sec-speciesconstructor">SpeciesConstructor</a></emu-xref>
                     <ul>
                       <li><span class="e-user-code">get <emu-xref href="#sec-regexp.prototype.constructor" title=""><a href="https://tc39.es/ecma262/#sec-regexp.prototype.constructor">RegExp.prototype.constructor</a></emu-xref></span></li>
-                      <li><span class="e-user-code">get <emu-xref href="#sec-get-regexp-@@species" title=""><a href="https://tc39.es/ecma262/#sec-get-regexp-@@species">get RegExp [ @@species ]</a></emu-xref></span></li>
+                      <li><span class="e-user-code">get <emu-xref href="#sec-get-regexp-%symbol.species%" title=""><a href="https://tc39.es/ecma262/#sec-get-regexp-%symbol.species%">get RegExp [ %Symbol.species% ]</a></emu-xref></span></li>
                     </ul>
                   </li>
                   <li><span class="e-user-code">get <emu-xref href="#sec-get-regexp.prototype.flags" title=""><a href="https://tc39.es/ecma262/#sec-get-regexp.prototype.flags">get RegExp.prototype.flags</a></emu-xref></span></li>
@@ -2494,7 +2525,7 @@ <h1><span class="secnum">30.1.6</span> Runtime Semantics: RegularExpressionPatte
                     <ul>
                       <li><emu-xref aoid="IsRegExp"><a href="https://tc39.es/ecma262/#sec-isregexp">IsRegExp</a></emu-xref></li>
                       <ul>
-                        <li><span class="e-user-code">get <emu-xref href="#sec-regexp.prototype-@@match" title=""><a href="https://tc39.es/ecma262/#sec-regexp.prototype-@@match">RegExp.prototype [ @@match ] ( <var>string</var> )</a></emu-xref></span></li>
+                        <li><span class="e-user-code">get <emu-xref href="#sec-regexp.prototype-%symbol.match%" title=""><a href="https://tc39.es/ecma262/#sec-regexp.prototype-%symbol.match%">RegExp.prototype [ %Symbol.match% ] ( <var>string</var> )</a></emu-xref></span></li>
                       </ul>
                     </ul>
                   </li>
@@ -2651,7 +2682,7 @@ <h1><span class="secnum">30.1.10</span> Runtime Semantics: ArrayPatternMatches</
     </emu-rhs>
 </emu-production>
 </emu-grammar>
-      <emu-alg><ol><li>If <emu-xref aoid="IsCallable"><a href="https://tc39.es/ecma262/#sec-iscallable">IsCallable</a></emu-xref>(? <emu-xref aoid="GetCached" id="_ref_142"><a href="#sec-get-cached" class="e-user-code">GetCached</a></emu-xref>(<var>subject</var>, <var>cacheGroup</var>, <emu-xref href="#sec-well-known-symbols" id="_ref_143"><a href="#sec-well-known-symbols">@@iterator</a></emu-xref>)) is <emu-val>false</emu-val>, return <emu-val>false</emu-val>.</li><li>Let <var>iteratorRecord</var> be ?&nbsp;<emu-xref aoid="GetIteratorCached" id="_ref_144"><a href="#sec-get-iterator-cached" class="e-user-code">GetIteratorCached</a></emu-xref>(<var>subject</var>, <var>cacheGroup</var>).</li><li>If <emu-nt id="_ref_466"><a href="#prod-MatchList">MatchList</a></emu-nt> is not present, then<ol><li>Return ?&nbsp;<emu-xref aoid="FinishListMatch" id="_ref_145"><a href="#sec-finish-list-match" class="e-user-code">FinishListMatch</a></emu-xref>(<var>subject</var>, <var>cacheGroup</var>, 0).</li></ol></li><li>Return ?&nbsp;<emu-xref aoid="ListPatternMatches" id="_ref_146"><a href="#sec-list-pattern-matches" class="e-user-code">ListPatternMatches</a></emu-xref> of <emu-nt id="_ref_467"><a href="#prod-MatchList">MatchList</a></emu-nt> with arguments <var>iteratorRecord</var> and <var>cacheGroup</var>.</li></ol></emu-alg>
+      <emu-alg><ol><li>If <emu-xref aoid="IsCallable"><a href="https://tc39.es/ecma262/#sec-iscallable">IsCallable</a></emu-xref>(? <emu-xref aoid="GetCached" id="_ref_142"><a href="#sec-get-cached" class="e-user-code">GetCached</a></emu-xref>(<var>subject</var>, <var>cacheGroup</var>, <emu-xref href="#sec-well-known-symbols" id="_ref_143"><a href="#sec-well-known-symbols">%Symbol.iterator%</a></emu-xref>)) is <emu-val>false</emu-val>, return <emu-val>false</emu-val>.</li><li>Let <var>iteratorRecord</var> be ?&nbsp;<emu-xref aoid="GetIteratorCached" id="_ref_144"><a href="#sec-get-iterator-cached" class="e-user-code">GetIteratorCached</a></emu-xref>(<var>subject</var>, <var>cacheGroup</var>).</li><li>If <emu-nt id="_ref_466"><a href="#prod-MatchList">MatchList</a></emu-nt> is not present, then<ol><li>Return ?&nbsp;<emu-xref aoid="FinishListMatch" id="_ref_145"><a href="#sec-finish-list-match" class="e-user-code">FinishListMatch</a></emu-xref>(<var>subject</var>, <var>cacheGroup</var>, 0).</li></ol></li><li>Return ?&nbsp;<emu-xref aoid="ListPatternMatches" id="_ref_146"><a href="#sec-list-pattern-matches" class="e-user-code">ListPatternMatches</a></emu-xref> of <emu-nt id="_ref_467"><a href="#prod-MatchList">MatchList</a></emu-nt> with arguments <var>iteratorRecord</var> and <var>cacheGroup</var>.</li></ol></emu-alg>
     </emu-clause>
 
     <emu-clause id="sec-list-pattern-matches" type="sdo" aoid="ListPatternMatches">
@@ -2796,7 +2827,7 @@ <h1><span class="secnum">30.1.14</span> Runtime Semantics: RelationalPatternMatc
     </emu-rhs>
 </emu-production>
 </emu-grammar>
-      <emu-alg><ol><li>If IsPropertyKey(<var>subject</var>) is <emu-val>false</emu-val>, return <emu-val>false</emu-val>.</li><li>Let <var>expr</var> be the <emu-nt><a href="https://tc39.es/ecma262/#prod-Expression">Expression</a></emu-nt> that is <emu-xref href="#sec-syntactic-grammar"><a href="https://tc39.es/ecma262/#sec-syntactic-grammar">covered</a></emu-xref> by <emu-nt id="_ref_504"><a href="#prod-PatternMatchingMemberExpression">PatternMatchingMemberExpression</a></emu-nt>.</li><li>Let <var>ref</var> be ?&nbsp;<emu-xref aoid="Evaluation"><a href="https://tc39.es/ecma262/#sec-evaluation" class="e-user-code">Evaluation</a></emu-xref> of <var>expr</var>.</li><li>Let <var>value</var> be ?&nbsp;<emu-xref aoid="GetValue"><a href="https://tc39.es/ecma262/#sec-getvalue" class="e-user-code">GetValue</a></emu-xref>(<var>ref</var>).</li><li>If <var>value</var> <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">is not an Object</a></emu-xref>, return <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="HasProperty"><a href="https://tc39.es/ecma262/#sec-hasproperty" class="e-user-code">HasProperty</a></emu-xref>(<var>value</var>, <var>subject</var>).</li></ol></emu-alg>
+      <emu-alg><ol><li>If <var>subject</var> is not a <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">property key</a></emu-xref>, return <emu-val>false</emu-val>.</li><li>Let <var>expr</var> be the <emu-nt><a href="https://tc39.es/ecma262/#prod-Expression">Expression</a></emu-nt> that is <emu-xref href="#sec-syntactic-grammar"><a href="https://tc39.es/ecma262/#sec-syntactic-grammar">covered</a></emu-xref> by <emu-nt id="_ref_504"><a href="#prod-PatternMatchingMemberExpression">PatternMatchingMemberExpression</a></emu-nt>.</li><li>Let <var>ref</var> be ?&nbsp;<emu-xref aoid="Evaluation"><a href="https://tc39.es/ecma262/#sec-evaluation" class="e-user-code">Evaluation</a></emu-xref> of <var>expr</var>.</li><li>Let <var>value</var> be ?&nbsp;<emu-xref aoid="GetValue"><a href="https://tc39.es/ecma262/#sec-getvalue" class="e-user-code">GetValue</a></emu-xref>(<var>ref</var>).</li><li>If <var>value</var> <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">is not an Object</a></emu-xref>, return <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="HasProperty"><a href="https://tc39.es/ecma262/#sec-hasproperty" class="e-user-code">HasProperty</a></emu-xref>(<var>value</var>, <var>subject</var>).</li></ol></emu-alg>
       <emu-grammar><emu-production name="RelationalPattern" collapsed="">
     <emu-nt><a href="#prod-RelationalPattern">RelationalPattern</a></emu-nt> <emu-geq>:</emu-geq> <emu-rhs a="qryc-uca" id="prod--dRddGUV">
         <emu-t>==</emu-t>
@@ -3081,7 +3112,7 @@ <h1><span class="secnum">30.3</span> Abstract Operations for Pattern Matching</h
     <emu-clause id="sec-invoke-custom-matcher" type="abstract operation" aoid="InvokeCustomMatcher">
       <h1><span class="secnum">30.3.1</span> InvokeCustomMatcher ( <var>matcher</var>, <var>subject</var>, <var>cacheGroup</var>, <var>kind</var>, <var>receiver</var> )</h1>
       <p>The abstract operation InvokeCustomMatcher takes arguments <var>matcher</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_189"><a href="#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>), <var>subject</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_190"><a href="#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>), <var>cacheGroup</var> (a <emu-xref href="#sec-map-constructor"><a href="https://tc39.es/ecma262/#sec-map-constructor">%Map%</a></emu-xref>), <var>kind</var> (<emu-const>boolean</emu-const> or <emu-const>list</emu-const>), and <var>receiver</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_191"><a href="#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>) and returns either a <emu-xref href="#sec-completion-record-specification-type"><a href="https://tc39.es/ecma262/#sec-completion-record-specification-type">normal completion containing</a></emu-xref> either a Boolean or an <emu-xref href="#sec-iterator-records"><a href="https://tc39.es/ecma262/#sec-iterator-records">Iterator Record</a></emu-xref>, or an <emu-xref href="#sec-completion-record-specification-type"><a href="https://tc39.es/ecma262/#sec-completion-record-specification-type">abrupt completion</a></emu-xref>. It performs the following steps when called:</p>
-      <emu-alg><ol><li>If <var>matcher</var> <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">is not an Object</a></emu-xref>, then<ol><li>If <var>kind</var> is <emu-const>boolean</emu-const>, return <emu-xref aoid="SameValueZero"><a href="https://tc39.es/ecma262/#sec-samevaluezero">SameValueZero</a></emu-xref>(<var>matcher</var>, <var>subject</var>).</li><li>Throw a <emu-val>TypeError</emu-val> exception.</li></ol></li><li>Let <var>f</var> be ?&nbsp;<emu-xref aoid="Get"><a href="https://tc39.es/ecma262/#sec-get-o-p" class="e-user-code">Get</a></emu-xref>(<var>matcher</var>, <emu-xref href="#sec-well-known-symbols" id="_ref_192"><a href="#sec-well-known-symbols">@@customMatcher</a></emu-xref>).</li><li>If <var>f</var> is <emu-val>undefined</emu-val>, then<ol><li>If <var>kind</var> is <emu-const>boolean</emu-const>, return <emu-xref aoid="SameValueNonNumber"><a href="https://tc39.es/ecma262/#sec-samevaluenonnumber">SameValueNonNumber</a></emu-xref>(<var>matcher</var>, <var>subject</var>).</li><li>Throw a <emu-val>TypeError</emu-val> exception.</li></ol></li><li>If <var>kind</var> is <emu-const>boolean</emu-const>, let <var>hint</var> be <emu-val>"boolean"</emu-val>.</li><li>Else, let <var>hint</var> be <emu-val>"list"</emu-val>.</li><li>Let <var>result</var> be ?&nbsp;<emu-xref aoid="Call"><a href="https://tc39.es/ecma262/#sec-call" class="e-user-code">Call</a></emu-xref>(<var>f</var>, <var>matcher</var>, « <var>subject</var>, <var>hint</var>, <var>receiver</var>&nbsp;»).</li><li>If <var>result</var> is <emu-val>false</emu-val>, return <emu-val>false</emu-val>.</li><li id="step-invoke-custom-matcher">If <var>kind</var> is <emu-const>boolean</emu-const>, return <emu-xref aoid="ToBoolean"><a href="https://tc39.es/ecma262/#sec-toboolean">ToBoolean</a></emu-xref>(<var>result</var>).</li><li>If <var>result</var> <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">is not an Object</a></emu-xref>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Perform ?&nbsp;<emu-xref aoid="GetIteratorCached" id="_ref_193"><a href="#sec-get-iterator-cached" class="e-user-code">GetIteratorCached</a></emu-xref>(<var>result</var>, <var>cacheGroup</var>).</li><li>Return <var>result</var>.</li></ol></emu-alg>
+      <emu-alg><ol><li>If <var>matcher</var> <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">is not an Object</a></emu-xref>, then<ol><li>If <var>kind</var> is <emu-const>boolean</emu-const>, return <emu-xref aoid="SameValueZero"><a href="https://tc39.es/ecma262/#sec-samevaluezero">SameValueZero</a></emu-xref>(<var>matcher</var>, <var>subject</var>).</li><li>Throw a <emu-val>TypeError</emu-val> exception.</li></ol></li><li>Let <var>f</var> be ?&nbsp;<emu-xref aoid="Get"><a href="https://tc39.es/ecma262/#sec-get-o-p" class="e-user-code">Get</a></emu-xref>(<var>matcher</var>, <emu-xref href="#sec-well-known-symbols" id="_ref_192"><a href="#sec-well-known-symbols">%Symbol.customMatcher%</a></emu-xref>).</li><li>If <var>f</var> is <emu-val>undefined</emu-val>, then<ol><li>If <var>kind</var> is <emu-const>boolean</emu-const>, return <emu-xref aoid="SameValueNonNumber"><a href="https://tc39.es/ecma262/#sec-samevaluenonnumber">SameValueNonNumber</a></emu-xref>(<var>matcher</var>, <var>subject</var>).</li><li>Throw a <emu-val>TypeError</emu-val> exception.</li></ol></li><li>If <var>kind</var> is <emu-const>boolean</emu-const>, let <var>hint</var> be <emu-val>"boolean"</emu-val>.</li><li>Else, let <var>hint</var> be <emu-val>"list"</emu-val>.</li><li>Let <var>result</var> be ?&nbsp;<emu-xref aoid="Call"><a href="https://tc39.es/ecma262/#sec-call" class="e-user-code">Call</a></emu-xref>(<var>f</var>, <var>matcher</var>, « <var>subject</var>, <var>hint</var>, <var>receiver</var>&nbsp;»).</li><li>If <var>result</var> is <emu-val>false</emu-val>, return <emu-val>false</emu-val>.</li><li id="step-invoke-custom-matcher">If <var>kind</var> is <emu-const>boolean</emu-const>, return <emu-xref aoid="ToBoolean"><a href="https://tc39.es/ecma262/#sec-toboolean">ToBoolean</a></emu-xref>(<var>result</var>).</li><li>If <var>result</var> <emu-xref href="#sec-object-type"><a href="https://tc39.es/ecma262/#sec-object-type">is not an Object</a></emu-xref>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Perform ?&nbsp;<emu-xref aoid="GetIteratorCached" id="_ref_193"><a href="#sec-get-iterator-cached" class="e-user-code">GetIteratorCached</a></emu-xref>(<var>result</var>, <var>cacheGroup</var>).</li><li>Return <var>result</var>.</li></ol></emu-alg>
       <emu-note type="editor"><span class="note">Editor's Note</span><div class="note-contents">
         The <var>hint</var> parameter is not a consensus in the champion group yet. This design is to solve <a href="https://github.com/tc39/proposal-pattern-matching/issues/253" target="_blank" data-print-href="">runtime performance concerns about custom matchers</a>.
       </div></emu-note>
@@ -3140,7 +3171,7 @@ <h1><span class="secnum">30.3.6</span> GetCached ( <var>subject</var>, <var>cach
     <emu-clause id="sec-get-iterator-cached" type="abstract operation" aoid="GetIteratorCached">
       <h1><span class="secnum">30.3.7</span> GetIteratorCached ( <var>subject</var>, <var>cacheGroup</var> )</h1>
       <p>The abstract operation GetIteratorCached takes arguments <var>subject</var> (an <emu-xref href="#sec-ecmascript-language-types" id="_ref_205"><a href="#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>) and <var>cacheGroup</var> (a <emu-xref href="#sec-map-constructor"><a href="https://tc39.es/ecma262/#sec-map-constructor">%Map%</a></emu-xref>) and returns either a <emu-xref href="#sec-completion-record-specification-type"><a href="https://tc39.es/ecma262/#sec-completion-record-specification-type">normal completion containing</a></emu-xref> an <emu-xref href="#sec-iterator-records"><a href="https://tc39.es/ecma262/#sec-iterator-records">Iterator Record</a></emu-xref> or an <emu-xref href="#sec-completion-record-specification-type"><a href="https://tc39.es/ecma262/#sec-completion-record-specification-type">abrupt completion</a></emu-xref>. It performs the following steps when called:</p>
-      <emu-alg><ol><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>cacheGroup</var> is created by <emu-xref aoid="CreateMatchCache" id="_ref_206"><a href="#sec-creatematchcache">CreateMatchCache</a></emu-xref> and used internally for pattern-matching.</li><li>Let <var>cache</var> be <emu-xref aoid="GetMatchCache" id="_ref_207"><a href="#sec-get-match-cache">GetMatchCache</a></emu-xref>(<var>subject</var>, <var>cacheGroup</var>).</li><li>Let <var>iteratorRecordObject</var> be !&nbsp;<emu-xref aoid="Get"><a href="https://tc39.es/ecma262/#sec-get-o-p">Get</a></emu-xref>(<var>cache</var>, <emu-val>"Iterator"</emu-val>).</li><li>If <var>iteratorRecordObject</var> is not <emu-val>undefined</emu-val>, return <var>iteratorRecordObject</var>.<var class="field">[[CachedIterator]]</var>.</li><li>Let <var>f</var> be ?&nbsp;<emu-xref aoid="GetCached" id="_ref_208"><a href="#sec-get-cached" class="e-user-code">GetCached</a></emu-xref>(<var>subject</var>, <var>cacheGroup</var>, <emu-xref href="#sec-well-known-symbols" id="_ref_209"><a href="#sec-well-known-symbols">@@iterator</a></emu-xref>).</li><li>Let <var>iteratorRecord</var> be ?&nbsp;<emu-xref aoid="GetIteratorFromMethod"><a href="https://tc39.es/ecma262/#sec-getiteratorfrommethod" class="e-user-code">GetIteratorFromMethod</a></emu-xref>(<var>subject</var>, <var>f</var>).</li><li>Set <var>iteratorRecordObject</var> to <emu-xref aoid="OrdinaryObjectCreate"><a href="https://tc39.es/ecma262/#sec-ordinaryobjectcreate">OrdinaryObjectCreate</a></emu-xref>(<emu-val>null</emu-val>, « <var class="field">[[CachedIterator]]</var>&nbsp;»).</li><li>Set <var>iteratorRecordObject</var>.<var class="field">[[CachedIterator]]</var> to <var>iteratorRecord</var>.</li><li>Perform !&nbsp;<emu-xref aoid="Set"><a href="https://tc39.es/ecma262/#sec-set-o-p-v-throw">Set</a></emu-xref>(<var>cache</var>, <emu-val>"Iterator"</emu-val>, <var>iteratorRecordObject</var>, <emu-val>true</emu-val>).</li><li>Perform !&nbsp;<emu-xref aoid="Call"><a href="https://tc39.es/ecma262/#sec-call">Call</a></emu-xref>(<emu-xref href="#sec-set.prototype.add"><a href="https://tc39.es/ecma262/#sec-set.prototype.add">%Set.prototype.add%</a></emu-xref>, !&nbsp;<emu-xref aoid="Get"><a href="https://tc39.es/ecma262/#sec-get-o-p">Get</a></emu-xref>(<var>cacheGroup</var>, <emu-val>"IteratorsToClose"</emu-val>), « <var>iteratorRecordObject</var>&nbsp;»).</li><li>Return <var>iteratorRecordObject</var>.<var class="field">[[CachedIterator]]</var>.</li></ol></emu-alg>
+      <emu-alg><ol><li><emu-xref href="#assert"><a href="https://tc39.es/ecma262/#assert">Assert</a></emu-xref>: <var>cacheGroup</var> is created by <emu-xref aoid="CreateMatchCache" id="_ref_206"><a href="#sec-creatematchcache">CreateMatchCache</a></emu-xref> and used internally for pattern-matching.</li><li>Let <var>cache</var> be <emu-xref aoid="GetMatchCache" id="_ref_207"><a href="#sec-get-match-cache">GetMatchCache</a></emu-xref>(<var>subject</var>, <var>cacheGroup</var>).</li><li>Let <var>iteratorRecordObject</var> be !&nbsp;<emu-xref aoid="Get"><a href="https://tc39.es/ecma262/#sec-get-o-p">Get</a></emu-xref>(<var>cache</var>, <emu-val>"Iterator"</emu-val>).</li><li>If <var>iteratorRecordObject</var> is not <emu-val>undefined</emu-val>, return <var>iteratorRecordObject</var>.<var class="field">[[CachedIterator]]</var>.</li><li>Let <var>f</var> be ?&nbsp;<emu-xref aoid="GetCached" id="_ref_208"><a href="#sec-get-cached" class="e-user-code">GetCached</a></emu-xref>(<var>subject</var>, <var>cacheGroup</var>, <emu-xref href="#sec-well-known-symbols" id="_ref_209"><a href="#sec-well-known-symbols">%Symbol.iterator%</a></emu-xref>).</li><li>Let <var>iteratorRecord</var> be ?&nbsp;<emu-xref aoid="GetIteratorFromMethod"><a href="https://tc39.es/ecma262/#sec-getiteratorfrommethod" class="e-user-code">GetIteratorFromMethod</a></emu-xref>(<var>subject</var>, <var>f</var>).</li><li>Set <var>iteratorRecordObject</var> to <emu-xref aoid="OrdinaryObjectCreate"><a href="https://tc39.es/ecma262/#sec-ordinaryobjectcreate">OrdinaryObjectCreate</a></emu-xref>(<emu-val>null</emu-val>, « <var class="field">[[CachedIterator]]</var>&nbsp;»).</li><li>Set <var>iteratorRecordObject</var>.<var class="field">[[CachedIterator]]</var> to <var>iteratorRecord</var>.</li><li>Perform !&nbsp;<emu-xref aoid="Set"><a href="https://tc39.es/ecma262/#sec-set-o-p-v-throw">Set</a></emu-xref>(<var>cache</var>, <emu-val>"Iterator"</emu-val>, <var>iteratorRecordObject</var>, <emu-val>true</emu-val>).</li><li>Perform !&nbsp;<emu-xref aoid="Call"><a href="https://tc39.es/ecma262/#sec-call">Call</a></emu-xref>(<emu-xref href="#sec-set.prototype.add"><a href="https://tc39.es/ecma262/#sec-set.prototype.add">%Set.prototype.add%</a></emu-xref>, !&nbsp;<emu-xref aoid="Get"><a href="https://tc39.es/ecma262/#sec-get-o-p">Get</a></emu-xref>(<var>cacheGroup</var>, <emu-val>"IteratorsToClose"</emu-val>), « <var>iteratorRecordObject</var>&nbsp;»).</li><li>Return <var>iteratorRecordObject</var>.<var class="field">[[CachedIterator]]</var>.</li></ol></emu-alg>
       <emu-note type="editor"><span class="note">Editor's Note</span><div class="note-contents">
         The <var class="field">[[CachedIterator]]</var> field is only used in GetIteratorCached and CloseCachedIterators. <emu-xref href="#sec-iterator-records"><a href="https://tc39.es/ecma262/#sec-iterator-records">Iterator Records</a></emu-xref> are not <emu-xref href="#sec-ecmascript-language-types" id="_ref_210"><a href="#sec-ecmascript-language-types">ECMAScript language values</a></emu-xref> and cannot be Set on an object, therefore an object is created to wrap the <emu-xref href="#sec-iterator-records"><a href="https://tc39.es/ecma262/#sec-iterator-records">Iterator Record</a></emu-xref>.
       </div></emu-note>
diff --git a/package.json b/package.json
index 9984143..0fcad41 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,8 @@
   },
   "license": "MIT",
   "devDependencies": {
-    "@tc39/ecma262-biblio": "^2.1.2722",
-    "ecmarkup": "^18.3.1"
-  }
+    "@tc39/ecma262-biblio": "^2.1.2771",
+    "ecmarkup": "^19.1.0"
+  },
+  "packageManager": "pnpm@9.9.0+sha512.60c18acd138bff695d339be6ad13f7e936eea6745660d4cc4a776d5247c540d0edee1a563695c183a66eb917ef88f2b4feb1fc25f32a7adcadc7aaf3438e99c1"
 }
diff --git a/spec.emu b/spec.emu
index 6dff139..4167143 100644
--- a/spec.emu
+++ b/spec.emu
@@ -83,10 +83,10 @@ contributors:
         <li><emu-xref href="#sec-relational-operators" title>The `is` expression</emu-xref></li>
         <li><emu-xref href="#sec-match-expression" title></emu-xref></li>
         <li>
-          Non-trivial Built-in @@customMatcher methods:
+          Non-trivial Built-in %Symbol.customMatcher% methods:
           <ul>
-            <li><emu-xref href="#sec-function.prototype-@@custommatcher" title></emu-xref></li>
-            <li><emu-xref href="#sec-regexp.prototype-@@custommatcher" title></emu-xref></li>
+            <li><emu-xref href="#sec-function.prototype-%symbol.custommatcher%" title></emu-xref></li>
+            <li><emu-xref href="#sec-regexp.prototype-%symbol.custommatcher%" title></emu-xref></li>
           </ul>
         </li>
         <li>(TODO) Scope analysis changes: <emu-xref href="#sec-syntax-directed-operations" title></emu-xref></li>
@@ -161,7 +161,7 @@ contributors:
             </tr>
             <tr>
               <td>
-                <ins><dfn>@@customMatcher</dfn></ins>
+                <ins><dfn>%Symbol.customMatcher%</dfn></ins>
               </td>
               <td>
                 <ins>`"Symbol.customMatcher"`</ins>
@@ -665,8 +665,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-object-constructor" number="2">
       <h1>Properties of the Object Constructor</h1>
 
-      <emu-clause id="sec-object-@@custommatcher" number="24">
-        <h1>Object [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-object-%symbol.custommatcher%" number="24">
+        <h1>Object [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_, ~boolean~).
@@ -683,8 +683,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-function-constructor" number="2">
       <h1>Properties of the Function Constructor</h1>
 
-      <emu-clause id="sec-function-@@custommatcher" number="2">
-        <h1>Function [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-function-%symbol.custommatcher%" number="2">
+        <h1>Function [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_, ~boolean~).
@@ -696,8 +696,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-function-prototype-object" number="3">
       <h1>Properties of the Function Prototype Object</h1>
 
-      <emu-clause id="sec-function.prototype-@@custommatcher" number="7">
-        <h1>Function.prototype [ @@customMatcher ] ( _subject_, _hint_, _receiver_ )</h1>
+      <emu-clause id="sec-function.prototype-%symbol.custommatcher%" number="7">
+        <h1>Function.prototype [ %Symbol.customMatcher% ] ( _subject_, _hint_, _receiver_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_).
@@ -741,7 +741,8 @@ contributors:
             There are
             <a href="https://github.com/tc39/proposal-pattern-matching/pull/293#issuecomment-1725097699" target="_blank">performance concerns</a>,
             <a href="https://github.com/tc39/proposal-pattern-matching/pull/293#issuecomment-1725097699" target="_blank">"hackable" concerns</a>, and
-            <a href="https://github.com/tc39/proposal-pattern-matching/pull/293#issuecomment-1725097699" target="_blank">interaction with @@hasInstance concerns</a>.
+            <a href="https://github.com/tc39/proposal-pattern-matching/pull/293#issuecomment-1725097699" target="_blank">interaction
+              with %Symbol.hasInstance% concerns</a>.
           </p>
           <p>Another approach is to use the `instanceof` semantics.</p>
         </emu-note>
@@ -755,8 +756,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-boolean-constructor" number="2">
       <h1>Properties of the Boolean Constructor</h1>
 
-      <emu-clause id="sec-boolean-@@custommatcher" number="2">
-        <h1>Boolean [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-boolean-%symbol.custommatcher%" number="2">
+        <h1>Boolean [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_).
@@ -780,12 +781,13 @@ contributors:
 
       <emu-clause id="sec-symbol.custommatcher" number="17">
         <h1>Symbol.customMatcher</h1>
-        <p>The initial value of `Symbol.customMatcher` is the well-known symbol @@customMatcher (<emu-xref href="#table-well-known-symbols"></emu-xref>).</p>
+        <p>The initial value of `Symbol.customMatcher` is the well-known symbol %Symbol.customMatcher% (<emu-xref
+            href="#table-well-known-symbols"></emu-xref>).</p>
         <p>This property has the attributes { [[Writable]]: *false*, [[Enumerable]]: *false*, [[Configurable]]: *false* }.</p>
       </emu-clause>
 
-      <emu-clause id="sec-symbol-@@custommatcher">
-        <h1>Symbol [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-symbol-%symbol.custommatcher%">
+        <h1>Symbol [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_).
@@ -826,8 +828,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-error-constructors" number="2">
       <h1>Properties of the Error Constructor</h1>
 
-      <emu-clause id="sec-error-@@custommatcher" number="2">
-          <h1>Error [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-error-%symbol.custommatcher%" number="2">
+        <h1>Error [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
           <p>This function performs the following steps when called:</p>
           <emu-alg>
             1. Perform ? ValidateCustomMatcherHint(_hint_, ~boolean~).
@@ -845,7 +847,10 @@ contributors:
 
     <emu-clause id="sec-properties-of-error-instances" number="4">
       <h1>Properties of Error Instances</h1>
-      <p>Error instances are ordinary objects that inherit properties from the Error prototype object and have an [[ErrorData]] internal slot whose value is <del>*undefined*</del> <ins>a String</ins>. The only specified uses of [[ErrorData]] is to identify Error, AggregateError, and _NativeError_ instances as Error objects within `Object.prototype.toString` <ins>and their @@customMatcher methods</ins>.</p>
+      <p>Error instances are ordinary objects that inherit properties from the Error prototype object and have an
+        [[ErrorData]] internal slot whose value is <del>*undefined*</del> <ins>a String</ins>. The only specified uses of
+        [[ErrorData]] is to identify Error, AggregateError, and _NativeError_ instances as Error objects within
+        `Object.prototype.toString` <ins>and their %Symbol.customMatcher% methods</ins>.</p>
       <emu-note type="editor">
         Rename this internal slot to [[ErrorKind]].
       </emu-note>
@@ -876,8 +881,8 @@ contributors:
       <emu-clause id="sec-properties-of-the-nativeerror-constructors" number="2">
         <h1>Properties of the _NativeError_ Constructors</h1>
 
-        <emu-clause id="sec-nativeerror-@@custommatcher" number="2">
-          <h1>_NativeError_ [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+        <emu-clause id="sec-nativeerror-%symbol.custommatcher%" number="2">
+          <h1>_NativeError_ [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
           <emu-alg>
             1. Perform ? ValidateCustomMatcherHint(_hint_, ~boolean~).
             1. If _subject_ does not have a [[ErrorData]] internal slot or _subject_.[[ErrorData]] is not _NativeError_, return *false*.
@@ -888,7 +893,11 @@ contributors:
 
       <emu-clause id="sec-properties-of-nativeerror-instances" number="4">
         <h1>Properties of _NativeError_ Instances</h1>
-        <p>_NativeError_ instances are ordinary objects that inherit properties from their _NativeError_ prototype object and have an [[ErrorData]] internal slot whose value is <del>*undefined*</del> <ins>a String</ins>. The only specified use of [[ErrorData]] is by `Object.prototype.toString` (<emu-xref href="#sec-object.prototype.tostring"></emu-xref>) <ins>and their @@customMatcher methods</ins> to identify Error, AggregateError, or _NativeError_ instances.</p>
+        <p>_NativeError_ instances are ordinary objects that inherit properties from their _NativeError_ prototype object and
+          have an [[ErrorData]] internal slot whose value is <del>*undefined*</del> <ins>a String</ins>. The only specified use
+          of [[ErrorData]] is by `Object.prototype.toString` (<emu-xref href="#sec-object.prototype.tostring"></emu-xref>)
+          <ins>and their %Symbol.customMatcher% methods</ins> to identify Error, AggregateError, or _NativeError_ instances.
+        </p>
       </emu-clause>
     </emu-clause>
 
@@ -919,8 +928,8 @@ contributors:
       <emu-clause id="sec-properties-of-the-aggregate-error-constructors" number="2">
         <h1>Properties of the AggregateError Constructor</h1>
 
-        <emu-clause id="sec-aggregate-error-@@custommatcher" number="2">
-          <h1>AggregateError [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+        <emu-clause id="sec-aggregate-error-%symbol.custommatcher%" number="2">
+          <h1>AggregateError [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
           <emu-alg>
             1. Perform ? ValidateCustomMatcherHint(_hint_, ~boolean~).
             1. If _subject_ does not have a [[ErrorData]] internal slot or _subject_.[[ErrorData]] is not *"AggregateError"*, return *false*.
@@ -931,7 +940,11 @@ contributors:
 
       <emu-clause id="sec-properties-of-aggregate-error-instances" number="4">
         <h1>Properties of AggregateError Instances</h1>
-        <p>AggregateError instances are ordinary objects that inherit properties from their AggregateError prototype object and have an [[ErrorData]] internal slot whose value is <del>*undefined*</del> <ins>a String</ins>. The only specified use of [[ErrorData]] is by `Object.prototype.toString` (<emu-xref href="#sec-object.prototype.tostring"></emu-xref>) <ins>and their @@customMatcher methods</ins> to identify Error, AggregateError, or _NativeError_ instances.</p>
+        <p>AggregateError instances are ordinary objects that inherit properties from their AggregateError prototype object and
+          have an [[ErrorData]] internal slot whose value is <del>*undefined*</del> <ins>a String</ins>. The only specified use
+          of [[ErrorData]] is by `Object.prototype.toString` (<emu-xref href="#sec-object.prototype.tostring"></emu-xref>)
+          <ins>and their %Symbol.customMatcher% methods</ins> to identify Error, AggregateError, or _NativeError_ instances.
+        </p>
       </emu-clause>
     </emu-clause>
   </emu-clause>
@@ -946,8 +959,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-number-constructor" number="2">
       <h1>Properties of the Number Constructor</h1>
 
-      <emu-clause id="sec-number-@@custommatcher" number="16">
-        <h1>Number [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-number-%symbol.custommatcher%" number="16">
+        <h1>Number [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_).
@@ -969,8 +982,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-bigint-constructor" number="2">
       <h1>Properties of the BigInt Constructor</h1>
 
-      <emu-clause id="sec-bigint-@@custommatcher" number="4">
-        <h1>BigInt [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-bigint-%symbol.custommatcher%" number="4">
+        <h1>BigInt [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_).
@@ -992,8 +1005,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-date-constructor" number="3">
       <h1>Properties of the Date Constructor</h1>
 
-      <emu-clause id="sec-date-@@custommatcher" number="5">
-        <h1>Date [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-date-%symbol.custommatcher%" number="5">
+        <h1>Date [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_, ~boolean~).
@@ -1014,8 +1027,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-string-constructor" number="2">
       <h1>Properties of the String Constructor</h1>
 
-      <emu-clause id="sec-string-@@custommatcher" number="5">
-        <h1>String [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-string-%symbol.custommatcher%" number="5">
+        <h1>String [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_).
@@ -1258,8 +1271,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-regexp-constructor" number="5">
       <h1>Properties of the RegExp Constructor</h1>
 
-      <emu-clause id="sec-regexp-@@custommatcher" number="3">
-        <h1>RegExp [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-regexp-%symbol.custommatcher%" number="3">
+        <h1>RegExp [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_, ~boolean~).
@@ -1267,7 +1280,7 @@ contributors:
           1. Return *true*.
         </emu-alg>
         <emu-note>
-          IsRegExp returns *true* for objects that have a truthy @@match property. Do we want this?
+          IsRegExp returns *true* for objects that have a truthy %Symbol.match% property. Do we want this?
         </emu-note>
       </emu-clause>
     </emu-clause>
@@ -1275,8 +1288,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-regexp-prototype-object" number="6">
       <h1>Properties of the RegExp Prototype Object</h1>
 
-      <emu-clause id="sec-regexp.prototype-@@custommatcher" number="20">
-        <h1>RegExp.prototype [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-regexp.prototype-%symbol.custommatcher%" number="20">
+        <h1>RegExp.prototype [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_).
@@ -1287,11 +1300,11 @@ contributors:
             1. Let _flags_ be ? Get(_regexp_, "flags").
             1. Perform ? RequireObjectCoercible(_flags_).
             1. If ? ToString(_flags_) contains *g*, then
-              1. Let _iterator_ be ? Call(? Get(_regexp_, @@matchAll), _regexp_, « _subject_ »).
+              1. Let _iterator_ be ? Call(? Get(_regexp_, %Symbol.matchAll%), _regexp_, « _subject_ »).
               1. Let _array_ be ? Call(<emu-xref href="#sec-array.from">%Array.from%</emu-xref>, %Array%, « _iterator_ »).
               1. If ! LengthOfArrayLike(_array_) is 0, return *false*.
               1. Return _array_.
-          1. Let _result_ be ? Call(? Get(_regexp_, @@match), _regexp_, « _subject_ »).
+          1. Let _result_ be ? Call(? Get(_regexp_, %Symbol.match%), _regexp_, « _subject_ »).
           1. If _result_ is *null*, return *false*.
           1. Return CreateArrayFromList(« _result_ »).
         </emu-alg>
@@ -1299,18 +1312,18 @@ contributors:
           <pre><code class="javascript">
             let regex = /(?&lt;id&gt;\d+)-?/g
             '012-345' is regex(["012-", "012"], { groups: { id: "345" } });
-            // true, match with @@matchAll
+            // true, match with %Symbol.matchAll%
 
             let regex2 = /(?&lt;id&gt;\d+)-?/
             '012-345' is regex({ groups: { id: "012" } });
-            // true, match with @@match
+            // true, match with %Symbol.match%
           </code></pre>
         </emu-note>
         <emu-note type="editor">
           The *"flags"* property in this algorithm is accessed twice, this is not ideal.
           Another access is
-          in <emu-xref href="#sec-regexp-prototype-matchall" title></emu-xref>
-          or <emu-xref href="#sec-regexp.prototype-@@match" title></emu-xref>
+          in <emu-xref href="#sec-regexp-prototype-%symbol.matchall%" title></emu-xref>
+          or <emu-xref href="#sec-regexp.prototype-%symbol.match%" title></emu-xref>
           depends on if the _regexp_ has the *g* flag.
         </emu-note>
         <emu-note type="editor">
@@ -1333,8 +1346,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-array-constructor" number="2">
       <h1>Properties of the Array Constructor</h1>
 
-      <emu-clause id="sec-array-@@custommatcher" number="6">
-        <h1>Array [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-array-%symbol.custommatcher%" number="6">
+        <h1>Array [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_).
@@ -1355,8 +1368,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-typedarray-constructors" number="6">
       <h1>Properties of the _TypedArray_ Constructors</h1>
 
-      <emu-clause id="sec-_typedarray_-@@custommatcher" number="3">
-        <h1>_TypedArray_ [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-_typedarray_-%symbol.custommatcher%" number="3">
+        <h1>_TypedArray_ [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_).
@@ -1384,8 +1397,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-map-constructor" number="2">
       <h1>Properties of the Map Constructor</h1>
 
-      <emu-clause id="sec-map-@@custommatcher" number="3">
-        <h1>Map [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-map-%symbol.custommatcher%" number="3">
+        <h1>Map [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_).
@@ -1411,8 +1424,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-set-constructor" number="2">
       <h1>Properties of the Set Constructor</h1>
 
-      <emu-clause id="sec-set-@@custommatcher" number="3">
-        <h1>Set [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-set-%symbol.custommatcher%" number="3">
+        <h1>Set [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_).
@@ -1438,8 +1451,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-weakmap-constructor" number="2">
       <h1>Properties of the WeakMap Constructor</h1>
 
-      <emu-clause id="sec-weakmap-@@custommatcher" number="2">
-        <h1>WeakMap [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-weakmap-%symbol.custommatcher%" number="2">
+        <h1>WeakMap [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_, ~boolean~).
@@ -1456,8 +1469,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-weakset-constructor" number="2">
       <h1>Properties of the WeakSet Constructor</h1>
 
-      <emu-clause id="sec-weakset-@@custommatcher" number="2">
-        <h1>WeakSet [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-weakset-%symbol.custommatcher%" number="2">
+        <h1>WeakSet [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_, ~boolean~).
@@ -1478,8 +1491,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-arraybuffer-constructor" number="5">
       <h1>Properties of the ArrayBuffer Constructor</h1>
 
-      <emu-clause id="sec-arraybuffer-@@custommatcher" number="4">
-        <h1>ArrayBuffer [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-arraybuffer-%symbol.custommatcher%" number="4">
+        <h1>ArrayBuffer [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_, ~boolean~).
@@ -1496,8 +1509,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-sharedarraybuffer-constructor" number="4">
       <h1>Properties of the SharedArrayBuffer Constructor</h1>
 
-      <emu-clause id="sec-sharedarraybuffer-@@custommatcher" number="3">
-        <h1>SharedArrayBuffer [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-sharedarraybuffer-%symbol.custommatcher%" number="3">
+        <h1>SharedArrayBuffer [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_, ~boolean~).
@@ -1514,8 +1527,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-dataview-constructor" number="3">
       <h1>Properties of the DataView Constructor</h1>
 
-      <emu-clause id="sec-dataview-@@custommatcher" number="2">
-        <h1>DataView [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-dataview-%symbol.custommatcher%" number="2">
+        <h1>DataView [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_, ~boolean~).
@@ -1536,8 +1549,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-weak-ref-constructor" number="2">
       <h1>Properties of the WeakRef Constructor</h1>
 
-      <emu-clause id="sec-weakref-@@custommatcher" number="2">
-        <h1>WeakRef [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-weakref-%symbol.custommatcher%" number="2">
+        <h1>WeakRef [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_).
@@ -1558,8 +1571,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-finalization-registry-constructor" number="2">
       <h1>Properties of the FinalizationRegistry Constructor</h1>
 
-      <emu-clause id="sec-finalizationregistry-@@custommatcher" number="2">
-        <h1>FinalizationRegistry [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-finalizationregistry-%symbol.custommatcher%" number="2">
+        <h1>FinalizationRegistry [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_, ~boolean~).
@@ -1580,8 +1593,8 @@ contributors:
     <emu-clause id="sec-properties-of-the-promise-constructor" number="4">
       <h1>Properties of the Promise Constructor</h1>
 
-      <emu-clause id="sec-promise-@@custommatcher" number="9">
-        <h1>Promise [ @@customMatcher ] ( _subject_, _hint_ )</h1>
+      <emu-clause id="sec-promise-%symbol.custommatcher%" number="9">
+        <h1>Promise [ %Symbol.customMatcher% ] ( _subject_, _hint_ )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Perform ? ValidateCustomMatcherHint(_hint_, ~boolean~).
@@ -1601,15 +1614,15 @@ contributors:
     <emu-clause id="sec-proxy-constructor" number="1">
       <h1>The Proxy Constructor</h1>
 
-      <emu-clause id="sec-proxy-@@custommatcher" number="2">
-        <h1>Proxy [ @@customMatcher ] ( )</h1>
+      <emu-clause id="sec-proxy-%symbol.custommatcher%" number="2">
+        <h1>Proxy [ %Symbol.customMatcher% ] ( )</h1>
         <p>This function performs the following steps when called:</p>
         <emu-alg>
           1. Throw a *TypeError* exception.
         </emu-alg>
       </emu-clause>
       <emu-note type="editor">
-        <p>All built-in constructors have a @@customMatcher method. This one is for design consistency.</p>
+        <p>All built-in constructors have a %Symbol.customMatcher% method. This one is for design consistency.</p>
         <p>This is not a consensus in the champion group.</p>
       </emu-note>
     </emu-clause>
@@ -1962,7 +1975,8 @@ contributors:
           PatternMatchingMemberExpression[?Yield, ?Await]
       </emu-grammar>
       <p>
-        The recommended way to match a String is to use the <emu-xref href="#sec-string-@@custommatcher" title></emu-xref>,
+        The recommended way to match a String is to use the <emu-xref href="#sec-string-%symbol.custommatcher%"
+          title></emu-xref>,
         but it can be replaced. This production adds the ability to do the unforgeable `typeof` test.
       </p>
       <pre><code class="javascript">
@@ -2433,11 +2447,14 @@ contributors:
         1. Return *true*.
       </emu-alg>
       <emu-note type="editor" class="show-ao-annotations">
-        <p>In order to create binding without triggering user code, we're not calling <emu-xref href="#sec-regexp.prototype-@@custommatcher" title></emu-xref> and making the behaviour unforgeable.</p>
-        <p>Contrast to call <emu-xref href="#sec-regexp.prototype-@@custommatcher" title></emu-xref> directly, this syntax-directed operation skipped the following user code:</p>
+        <p>In order to create binding without triggering user code, we're not calling <emu-xref
+            href="#sec-regexp.prototype-%symbol.custommatcher%" title></emu-xref> and making the behaviour unforgeable.</p>
+        <p>Contrast to call <emu-xref href="#sec-regexp.prototype-%symbol.custommatcher%" title></emu-xref> directly, this
+          syntax-directed operation skipped the following user code:</p>
         <ul>
           <li>
-            <span class="e-user-code">get and call <emu-xref href="#sec-regexp.prototype-@@custommatcher" title></emu-xref></span>
+            <span class="e-user-code">get and call <emu-xref href="#sec-regexp.prototype-%symbol.custommatcher%"
+                title></emu-xref></span>
             <ul>
               <li>
                 <span class="e-user-code">get and call <emu-xref href="#sec-regexp.prototype.test" title></emu-xref></span>
@@ -2451,7 +2468,7 @@ contributors:
                 </ul>
               </li>
               <li>
-                <span class="e-user-code">get and call <emu-xref href="#sec-regexp.prototype-@@match" title></emu-xref></span>
+                <span class="e-user-code">get and call <emu-xref href="#sec-regexp.prototype-%symbol.match%" title></emu-xref></span>
                 <ul>
                   <li><span class="e-user-code">get <emu-xref href="#sec-get-regexp.prototype.flags" title></emu-xref></span></li>
                   <li>
@@ -2463,13 +2480,13 @@ contributors:
                 </ul>
               </li>
               <li>
-                <span class="e-user-code">get and call <emu-xref href="#sec-regexp-prototype-matchall" title></emu-xref></span>
+                <span class="e-user-code">get and call <emu-xref href="#sec-regexp-prototype-%symbol.matchall%" title></emu-xref></span>
                 <ul>
                   <li>
                     SpeciesConstructor
                     <ul>
                       <li><span class="e-user-code">get <emu-xref href="#sec-regexp.prototype.constructor" title></emu-xref></span></li>
-                      <li><span class="e-user-code">get <emu-xref href="#sec-get-regexp-@@species" title></emu-xref></span></li>
+                      <li><span class="e-user-code">get <emu-xref href="#sec-get-regexp-%symbol.species%" title></emu-xref></span></li>
                     </ul>
                   </li>
                   <li><span class="e-user-code">get <emu-xref href="#sec-get-regexp.prototype.flags" title></emu-xref></span></li>
@@ -2478,7 +2495,7 @@ contributors:
                     <ul>
                       <li>IsRegExp</li>
                       <ul>
-                        <li><span class="e-user-code">get <emu-xref href="#sec-regexp.prototype-@@match" title></emu-xref></span></li>
+                        <li><span class="e-user-code">get <emu-xref href="#sec-regexp.prototype-%symbol.match%" title></emu-xref></span></li>
                       </ul>
                     </ul>
                   </li>
@@ -2687,7 +2704,7 @@ contributors:
         ArrayPattern : `[` MatchList? `]`
       </emu-grammar>
       <emu-alg>
-        1. If IsCallable(? GetCached(_subject_, _cacheGroup_, @@iterator)) is *false*, return *false*.
+        1. If IsCallable(? GetCached(_subject_, _cacheGroup_, %Symbol.iterator%)) is *false*, return *false*.
         1. Let _iteratorRecord_ be ? GetIteratorCached(_subject_, _cacheGroup_).
         1. If |MatchList| is not present, then
           1. Return ? FinishListMatch(_subject_, _cacheGroup_, 0).
@@ -2909,7 +2926,7 @@ contributors:
         RelationalPattern : `in` PatternMatchingMemberExpression
       </emu-grammar>
       <emu-alg>
-        1. If IsPropertyKey(_subject_) is *false*, return *false*.
+        1. If _subject_ is not a property key, return *false*.
         1. Let _expr_ be the |Expression| that is covered by |PatternMatchingMemberExpression|.
         1. Let _ref_ be ? Evaluation of _expr_.
         1. Let _value_ be ? GetValue(_ref_).
@@ -3188,7 +3205,7 @@ contributors:
         1. If _matcher_ is not an Object, then
           1. If _kind_ is ~boolean~, return SameValueZero(_matcher_, _subject_).
           1. Throw a *TypeError* exception.
-        1. Let _f_ be ? Get(_matcher_, @@customMatcher).
+        1. Let _f_ be ? Get(_matcher_, %Symbol.customMatcher%).
         1. If _f_ is *undefined*, then
           1. If _kind_ is ~boolean~, return SameValueNonNumber(_matcher_, _subject_).
           1. Throw a *TypeError* exception.
@@ -3339,7 +3356,7 @@ contributors:
         1. Let _cache_ be GetMatchCache(_subject_, _cacheGroup_).
         1. Let _iteratorRecordObject_ be ! Get(_cache_, *"Iterator"*).
         1. If _iteratorRecordObject_ is not *undefined*, return _iteratorRecordObject_.[[CachedIterator]].
-        1. Let _f_ be ? GetCached(_subject_, _cacheGroup_, @@iterator).
+        1. Let _f_ be ? GetCached(_subject_, _cacheGroup_, %Symbol.iterator%).
         1. Let _iteratorRecord_ be ? GetIteratorFromMethod(_subject_, _f_).
         1. Set _iteratorRecordObject_ to OrdinaryObjectCreate(*null*, « [[CachedIterator]] »).
         1. Set _iteratorRecordObject_.[[CachedIterator]] to _iteratorRecord_.