Merge pull request #1707 from leobalter/private-methods-args

Add class private methods (include static) to arguments templates

src/arguments/args-trailing-comma-multiple.case

@@ -4,13 +4,21 @@
 /*---
 desc: A trailing comma should not increase the arguments.length, using multiple args
 template: default
-esid: prod-Arguments
 info: |
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 //- args

src/arguments/args-trailing-comma-null.case

@@ -3,13 +3,21 @@
 /*---
 desc: A trailing comma after null should not increase the arguments.length
 template: default
-esid: prod-Arguments
 info: |
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 //- args

src/arguments/args-trailing-comma-single-args.case

@@ -4,13 +4,21 @@
 /*---
 desc: A trailing comma should not increase the arguments.length, using a single arg
 template: default
-esid: prod-Arguments
 info: |
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 //- args

src/arguments/args-trailing-comma-spread-operator.case

@@ -0,0 +1,34 @@
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: A trailing comma should not increase the arguments.length, using spread args
+template: default
+info: |
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+//- setup
+var arr = [2, 3];
+
+//- args
+42, ...[1], ...arr,
+//- body
+assert.sameValue(arguments.length, 4);
+assert.sameValue(arguments[0], 42);
+assert.sameValue(arguments[1], 1);
+assert.sameValue(arguments[2], 2);
+assert.sameValue(arguments[3], 3);

src/arguments/args-trailing-comma-undefined.case

@@ -3,13 +3,21 @@
 /*---
 desc: A trailing comma after undefined should not increase the arguments.length
 template: default
-esid: prod-Arguments
 info: |
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 //- args

src/arguments/default/async-gen-func-decl.template

@@ -2,7 +2,7 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-path: language/statements/async-generator/
+path: language/arguments-object/cls-decl-async-gen-func-
 name: async generator function declaration
 esid: sec-asyncgenerator-definitions-instantiatefunctionobject
 info: |

src/arguments/default/async-gen-func-expr.template

@@ -2,7 +2,7 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-path: language/expressions/async-generator/
+path: language/arguments-object/cls-expr-async-gen-func-
 name: async generator function expression
 esid: sec-asyncgenerator-definitions-evaluation
 info: |

src/arguments/default/async-gen-meth.template

@@ -1,7 +1,7 @@
 // Copyright (C) 2016 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
-path: language/expressions/object/method-definition/async-gen-meth-
+path: language/arguments-object/async-gen-meth-
 name: async generator method
 esid: sec-asyncgenerator-definitions-propertydefinitionevaluation
 info: |

src/arguments/default/async-gen-named-func-expr.template

@@ -2,7 +2,7 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-path: language/expressions/async-generator/named-
+path: language/arguments-object/async-gen-named-func-expr-
 name: async generator named function expression
 esid: sec-asyncgenerator-definitions-evaluation
 info: |

src/arguments/default/cls-decl-async-gen-meth-static.template

@@ -2,7 +2,7 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-path: language/statements/class/async-gen-meth-static-
+path: language/arguments-object/cls-decl-async-gen-meth-static-
 name: static class expression generator method
 esid: sec-runtime-semantics-bindingclassdeclarationevaluation
 info: |

src/arguments/default/cls-decl-async-gen-meth.template

@@ -1,7 +1,7 @@
 // Copyright (C) 2016 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 /*---
-path: language/statements/class/async-gen-meth-
+path: language/arguments-object/cls-decl-async-gen-meth-
 name: class expression method
 esid: sec-class-definitions-runtime-semantics-evaluation
 info: |

src/arguments/default/cls-decl-async-private-gen-meth-static.template

@@ -0,0 +1,39 @@
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/arguments-object/cls-decl-async-private-gen-meth-static-
+name: static class expression private generator method
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+info: |
+  Arguments :
+    ( )
+    ( ArgumentList )
+    ( ArgumentList , )
+
+  ArgumentList :
+    AssignmentExpression
+    ... AssignmentExpression
+    ArgumentList , AssignmentExpression
+    ArgumentList , ... AssignmentExpression
+
+
+flags: [async]
+features: [async-iteration, class, class-static-methods-private]
+---*/
+
+var callCount = 0;
+class C {
+  static async * #method() {
+    /*{ body }*/
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+      return this.#method;
+  }
+}
+
+C.method(/*{ args }*/).next().then(() => {
+    assert.sameValue(callCount, 1, 'method invoked exactly once');
+}).then($DONE, $DONE);

src/arguments/default/cls-decl-async-private-gen-meth.template

@@ -0,0 +1,56 @@
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/arguments-object/cls-decl-async-private-gen-meth-
+name: static class declaration private generator method
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+info: |
+    ClassDeclaration : class BindingIdentifier ClassTail
+
+    1. Let className be StringValue of BindingIdentifier.
+    2. Let value be the result of ClassDefinitionEvaluation of ClassTail with
+       argument className.
+    [...]
+
+    14.5.14 Runtime Semantics: ClassDefinitionEvaluation
+
+    21. For each ClassElement m in order from methods
+        a. If IsStatic of m is false, then
+           i. Let status be the result of performing
+              PropertyDefinitionEvaluation for m with arguments proto and
+              false.
+        [...]
+
+    Runtime Semantics: PropertyDefinitionEvaluation
+
+    AsyncGeneratorMethod :
+        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
+            { AsyncGeneratorBody }
+
+    1. Let propKey be the result of evaluating PropertyName.
+    2. ReturnIfAbrupt(propKey).
+    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
+       Otherwise let strict be false.
+    4. Let scope be the running execution context's LexicalEnvironment.
+    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
+       AsyncGeneratorBody, scope, strict).
+    [...]
+flags: [async]
+features: [async-iteration, class, class-methods-private]
+---*/
+
+var callCount = 0;
+class C {
+  async * #method() {
+    /*{ body }*/
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(/*{ args }*/).next().then(() => {
+    assert.sameValue(callCount, 1, 'method invoked exactly once');
+}).then($DONE, $DONE);

src/arguments/default/cls-decl-private-gen-meth-static.template

@@ -0,0 +1,31 @@
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/arguments-object/cls-decl-private-gen-meth-static-
+name: class declaration private generator method
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+features: [generators, class, class-static-methods-private]
+---*/
+
+var callCount = 0;
+class C {
+  static * #method() {
+    /*{ body }*/
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+    return this.#method;
+  }
+}
+
+C.method(/*{ args }*/).next();
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

src/arguments/default/cls-decl-private-gen-meth.template

@@ -0,0 +1,31 @@
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/arguments-object/cls-decl-private-gen-meth-
+name: class declaration private generator method
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+features: [generators, class, class-methods-private]
+---*/
+
+var callCount = 0;
+class C {
+  * #method() {
+    /*{ body }*/
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(/*{ args }*/).next();
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

src/arguments/default/cls-decl-private-meth-static.template

@@ -0,0 +1,31 @@
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/arguments-object/cls-decl-private-meth-static-
+name: static class declaration private method
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+features: [class, class, class-static-methods-private]
+---*/
+
+var callCount = 0;
+class C {
+  static #method() {
+    /*{ body }*/
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+    return this.#method;
+  }
+}
+
+C.method(/*{ args }*/);
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

src/arguments/default/cls-decl-private-meth.template

@@ -0,0 +1,31 @@
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/arguments-object/cls-decl-private-meth-
+name: class declaration private method
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+features: [class, class, class-methods-private]
+---*/
+
+var callCount = 0;
+class C {
+  #method() {
+    /*{ body }*/
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(/*{ args }*/);
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

src/arguments/default/cls-expr-async-gen-meth-static.template

@@ -2,7 +2,7 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-path: language/expressions/class/async-gen-meth-static-
+path: language/arguments-object/cls-expr-async-gen-meth-static-
 name: static class expression async generator method
 esid: sec-class-definitions-runtime-semantics-evaluation
 info: |

src/arguments/default/cls-expr-async-gen-meth.template

@@ -2,7 +2,7 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-path: language/expressions/class/async-gen-meth-
+path: language/arguments-object/cls-expr-async-gen-meth-
 name: class expression async generator method
 esid: sec-class-definitions-runtime-semantics-evaluation
 info: |

src/arguments/default/cls-expr-async-private-gen-meth-static.template

@@ -0,0 +1,58 @@
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/arguments-object/cls-expr-async-private-gen-meth-static-
+name: static class expression async private generator method
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+info: |
+    ClassExpression : class BindingIdentifieropt ClassTail
+
+    1. If BindingIdentifieropt is not present, let className be undefined.
+    2. Else, let className be StringValue of BindingIdentifier.
+    3. Let value be the result of ClassDefinitionEvaluation of ClassTail
+       with argument className.
+    [...]
+
+    14.5.14 Runtime Semantics: ClassDefinitionEvaluation
+
+    21. For each ClassElement m in order from methods
+        a. If IsStatic of m is false, then
+        b. Else,
+           Let status be the result of performing PropertyDefinitionEvaluation
+           for m with arguments F and false.
+    [...]
+
+    Runtime Semantics: PropertyDefinitionEvaluation
+
+    AsyncGeneratorMethod :
+        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
+            { AsyncGeneratorBody }
+
+    1. Let propKey be the result of evaluating PropertyName.
+    2. ReturnIfAbrupt(propKey).
+    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
+       Otherwise let strict be false.
+    4. Let scope be the running execution context's LexicalEnvironment.
+    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
+       AsyncGeneratorBody, scope, strict).
+    [...]
+flags: [async]
+features: [async-iteration, class, class-static-methods-private]
+---*/
+
+var callCount = 0;
+var C = class {
+  static async * #method() {
+    /*{ body }*/
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+    return this.#method;
+  }
+};
+
+C.method(/*{ args }*/).next().then(() => {
+    assert.sameValue(callCount, 1, 'method invoked exactly once');
+}).then($DONE, $DONE);

src/arguments/default/cls-expr-async-private-gen-meth.template

@@ -0,0 +1,59 @@
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/arguments-object/cls-expr-async-private-gen-meth-
+name: class expression async private generator method
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+info: |
+    ClassExpression : class BindingIdentifieropt ClassTail
+
+    1. If BindingIdentifieropt is not present, let className be undefined.
+    2. Else, let className be StringValue of BindingIdentifier.
+    3. Let value be the result of ClassDefinitionEvaluation of ClassTail
+       with argument className.
+    [...]
+
+    14.5.14 Runtime Semantics: ClassDefinitionEvaluation
+
+    21. For each ClassElement m in order from methods
+        a. If IsStatic of m is false, then
+           i. Let status be the result of performing
+              PropertyDefinitionEvaluation for m with arguments proto and
+              false.
+        [...]
+
+    Runtime Semantics: PropertyDefinitionEvaluation
+
+    AsyncGeneratorMethod :
+        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
+            { AsyncGeneratorBody }
+
+    1. Let propKey be the result of evaluating PropertyName.
+    2. ReturnIfAbrupt(propKey).
+    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
+       Otherwise let strict be false.
+    4. Let scope be the running execution context's LexicalEnvironment.
+    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
+       AsyncGeneratorBody, scope, strict).
+    [...]
+flags: [async]
+features: [async-iteration, class, class-methods-private]
+---*/
+
+var callCount = 0;
+var C = class {
+  async * #method() {
+    /*{ body }*/
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+};
+
+new C().method(/*{ args }*/).next().then(() => {
+    assert.sameValue(callCount, 1, 'method invoked exactly once');
+}).then($DONE, $DONE);
+

src/arguments/default/cls-expr-private-gen-meth-static.template

@@ -0,0 +1,31 @@
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/arguments-object/cls-expr-private-gen-meth-static-
+name: static class expression private generator method
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+features: [generators, class, class-static-methods-private]
+---*/
+
+var callCount = 0;
+var C = class {
+  static * #method() {
+    /*{ body }*/
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+    return this.#method;
+  }
+};
+
+C.method(/*{ args }*/).next();
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

src/arguments/default/cls-expr-private-gen-meth.template

@@ -0,0 +1,31 @@
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/arguments-object/cls-expr-private-gen-meth-
+name: class expression private generator method
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+features: [generators, class, class-methods-private]
+---*/
+
+var callCount = 0;
+var C = class {
+  * #method() {
+    /*{ body }*/
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+};
+
+new C().method(/*{ args }*/).next();
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

src/arguments/default/cls-expr-private-meth-static.template

@@ -0,0 +1,31 @@
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/arguments-object/cls-expr-private-meth-static-
+name: static class expression private method
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+features: [class, class-static-methods-private]
+---*/
+
+var callCount = 0;
+var C = class {
+  static #method() {
+    /*{ body }*/
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+    return this.#method;
+  }
+};
+
+C.method(/*{ args }*/);
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

src/arguments/default/cls-expr-private-meth.template

@@ -0,0 +1,31 @@
+// Copyright (C) 2018 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+path: language/arguments-object/cls-expr-private-meth-
+name: class expression private method
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+features: [class, class-methods-private]
+---*/
+
+var callCount = 0;
+var C = class {
+  #method() {
+    /*{ body }*/
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+};
+
+new C().method(/*{ args }*/);
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/async-gen-meth-args-trailing-comma-multiple.js

@@ -23,9 +23,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 var callCount = 0;

test/language/arguments-object/async-gen-meth-args-trailing-comma-null.js

@@ -23,9 +23,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 var callCount = 0;

test/language/arguments-object/async-gen-meth-args-trailing-comma-single-args.js

@@ -23,9 +23,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 var callCount = 0;

test/language/arguments-object/async-gen-meth-args-trailing-comma-spread-operator.js

@@ -0,0 +1,59 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-spread-operator.case
+// - src/arguments/default/async-gen-meth.template
+/*---
+description: A trailing comma should not increase the arguments.length, using spread args (async generator method)
+esid: sec-asyncgenerator-definitions-propertydefinitionevaluation
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    AsyncGeneratorMethod :
+        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
+            { AsyncGeneratorBody }
+
+    1. Let propKey be the result of evaluating PropertyName.
+    2. ReturnIfAbrupt(propKey).
+    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
+       Otherwise let strict be false.
+    4. Let scope be the running execution context's LexicalEnvironment.
+    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
+       AsyncGeneratorBody, scope, strict).
+    [...]
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+var arr = [2, 3];
+
+
+var callCount = 0;
+var obj = {
+  async *method() {
+    assert.sameValue(arguments.length, 4);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 1);
+    assert.sameValue(arguments[2], 2);
+    assert.sameValue(arguments[3], 3);
+    callCount = callCount + 1;
+  }
+};
+
+// Stores a reference `ref` for case evaluation
+var ref = obj.method;
+
+ref(42, ...[1], ...arr,).next().then(() => {
+    assert.sameValue(callCount, 1, 'generator method invoked exactly once');
+}).then($DONE, $DONE);

test/language/arguments-object/async-gen-meth-args-trailing-comma-undefined.js

@@ -23,9 +23,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 var callCount = 0;

test/language/arguments-object/async-gen-named-func-expr-args-trailing-comma-multiple.js

@@ -18,9 +18,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/async-gen-named-func-expr-args-trailing-comma-null.js

@@ -18,9 +18,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/async-gen-named-func-expr-args-trailing-comma-single-args.js

@@ -18,9 +18,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/async-gen-named-func-expr-args-trailing-comma-spread-operator.js

@@ -0,0 +1,52 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-spread-operator.case
+// - src/arguments/default/async-gen-named-func-expr.template
+/*---
+description: A trailing comma should not increase the arguments.length, using spread args (async generator named function expression)
+esid: sec-asyncgenerator-definitions-evaluation
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    AsyncGeneratorExpression : async [no LineTerminator here] function * BindingIdentifier
+        ( FormalParameters ) { AsyncGeneratorBody }
+
+        [...]
+        7. Let closure be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters,
+           AsyncGeneratorBody, funcEnv, strict).
+        [...]
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+var arr = [2, 3];
+
+
+
+var callCount = 0;
+// Stores a reference `ref` for case evaluation
+var ref;
+ref = async function* g() {
+  assert.sameValue(arguments.length, 4);
+  assert.sameValue(arguments[0], 42);
+  assert.sameValue(arguments[1], 1);
+  assert.sameValue(arguments[2], 2);
+  assert.sameValue(arguments[3], 3);
+  callCount = callCount + 1;
+};
+
+ref(42, ...[1], ...arr,).next().then(() => {
+    assert.sameValue(callCount, 1, 'generator function invoked exactly once');
+}).then($DONE, $DONE);

test/language/arguments-object/async-gen-named-func-expr-args-trailing-comma-undefined.js

@@ -18,9 +18,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-async-gen-func-args-trailing-comma-multiple.js

@@ -18,9 +18,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-async-gen-func-args-trailing-comma-null.js

@@ -18,9 +18,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-async-gen-func-args-trailing-comma-single-args.js

@@ -18,9 +18,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-async-gen-func-args-trailing-comma-spread-operator.js

@@ -0,0 +1,51 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-spread-operator.case
+// - src/arguments/default/async-gen-func-decl.template
+/*---
+description: A trailing comma should not increase the arguments.length, using spread args (async generator function declaration)
+esid: sec-asyncgenerator-definitions-instantiatefunctionobject
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    AsyncGeneratorDeclaration : async [no LineTerminator here] function * BindingIdentifier
+        ( FormalParameters ) { AsyncGeneratorBody }
+
+        [...]
+        3. Let F be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters, AsyncGeneratorBody,
+            scope, strict).
+        [...]
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+var arr = [2, 3];
+
+
+
+var callCount = 0;
+// Stores a reference `ref` for case evaluation
+async function* ref() {
+  assert.sameValue(arguments.length, 4);
+  assert.sameValue(arguments[0], 42);
+  assert.sameValue(arguments[1], 1);
+  assert.sameValue(arguments[2], 2);
+  assert.sameValue(arguments[3], 3);
+  callCount = callCount + 1;
+}
+
+ref(42, ...[1], ...arr,).next().then(() => {
+    assert.sameValue(callCount, 1, 'generator function invoked exactly once');
+}).then($DONE, $DONE);

test/language/arguments-object/cls-decl-async-gen-func-args-trailing-comma-undefined.js

@@ -18,9 +18,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-async-gen-meth-args-trailing-comma-multiple.js

@@ -41,9 +41,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 var callCount = 0;

test/language/arguments-object/cls-decl-async-gen-meth-args-trailing-comma-null.js

@@ -41,9 +41,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 var callCount = 0;

test/language/arguments-object/cls-decl-async-gen-meth-args-trailing-comma-single-args.js

@@ -41,9 +41,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 var callCount = 0;

test/language/arguments-object/cls-decl-async-gen-meth-args-trailing-comma-spread-operator.js

@@ -0,0 +1,77 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-spread-operator.case
+// - src/arguments/default/cls-decl-async-gen-meth.template
+/*---
+description: A trailing comma should not increase the arguments.length, using spread args (class expression method)
+esid: sec-class-definitions-runtime-semantics-evaluation
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    ClassDeclaration : class BindingIdentifier ClassTail
+
+    1. Let className be StringValue of BindingIdentifier.
+    2. Let value be the result of ClassDefinitionEvaluation of ClassTail with
+       argument className.
+    [...]
+
+    14.5.14 Runtime Semantics: ClassDefinitionEvaluation
+
+    21. For each ClassElement m in order from methods
+        a. If IsStatic of m is false, then
+           i. Let status be the result of performing
+              PropertyDefinitionEvaluation for m with arguments proto and
+              false.
+        [...]
+
+    Runtime Semantics: PropertyDefinitionEvaluation
+
+    AsyncGeneratorMethod :
+        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
+            { AsyncGeneratorBody }
+
+    1. Let propKey be the result of evaluating PropertyName.
+    2. ReturnIfAbrupt(propKey).
+    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
+       Otherwise let strict be false.
+    4. Let scope be the running execution context's LexicalEnvironment.
+    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
+       AsyncGeneratorBody, scope, strict).
+    [...]
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+var arr = [2, 3];
+
+
+var callCount = 0;
+class C {
+  async *method() {
+    assert.sameValue(arguments.length, 4);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 1);
+    assert.sameValue(arguments[2], 2);
+    assert.sameValue(arguments[3], 3);
+    callCount = callCount + 1;
+  }
+}
+
+// Stores a reference `ref` for case evaluation
+var ref = C.prototype.method;
+
+ref(42, ...[1], ...arr,).next().then(() => {
+    assert.sameValue(callCount, 1, 'method invoked exactly once');
+}).then($DONE, $DONE);

test/language/arguments-object/cls-decl-async-gen-meth-args-trailing-comma-undefined.js

@@ -41,9 +41,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 var callCount = 0;

test/language/arguments-object/cls-decl-async-gen-meth-static-args-trailing-comma-multiple.js

@@ -41,9 +41,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-async-gen-meth-static-args-trailing-comma-null.js

@@ -41,9 +41,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-async-gen-meth-static-args-trailing-comma-single-args.js

@@ -41,9 +41,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-async-gen-meth-static-args-trailing-comma-spread-operator.js

@@ -0,0 +1,78 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-spread-operator.case
+// - src/arguments/default/cls-decl-async-gen-meth-static.template
+/*---
+description: A trailing comma should not increase the arguments.length, using spread args (static class expression generator method)
+esid: sec-runtime-semantics-bindingclassdeclarationevaluation
+features: [async-iteration]
+flags: [generated, async]
+info: |
+    ClassDeclaration : class BindingIdentifier ClassTail
+
+    1. Let className be StringValue of BindingIdentifier.
+    2. Let value be the result of ClassDefinitionEvaluation of ClassTail with
+       argument className.
+    [...]
+
+    14.5.14 Runtime Semantics: ClassDefinitionEvaluation
+
+    21. For each ClassElement m in order from methods
+        a. If IsStatic of m is false, then
+        b. Else,
+           Let status be the result of performing PropertyDefinitionEvaluation for
+           m with arguments F and false.
+    [...]
+
+    Runtime Semantics: PropertyDefinitionEvaluation
+
+    AsyncGeneratorMethod :
+        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
+            { AsyncGeneratorBody }
+
+    1. Let propKey be the result of evaluating PropertyName.
+    2. ReturnIfAbrupt(propKey).
+    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
+       Otherwise let strict be false.
+    4. Let scope be the running execution context's LexicalEnvironment.
+    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
+       AsyncGeneratorBody, scope, strict).
+    [...]
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+var arr = [2, 3];
+
+
+
+var callCount = 0;
+class C {
+  static async *method() {
+    assert.sameValue(arguments.length, 4);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 1);
+    assert.sameValue(arguments[2], 2);
+    assert.sameValue(arguments[3], 3);
+    callCount = callCount + 1;
+  }
+}
+
+// Stores a reference `ref` for case evaluation
+var ref = C.method;
+
+ref(42, ...[1], ...arr,).next().then(() => {
+    assert.sameValue(callCount, 1, 'method invoked exactly once');
+}).then($DONE, $DONE);

test/language/arguments-object/cls-decl-async-gen-meth-static-args-trailing-comma-undefined.js

@@ -41,9 +41,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-async-private-gen-meth-args-trailing-comma-multiple.js

@@ -0,0 +1,74 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-multiple.case
+// - src/arguments/default/cls-decl-async-private-gen-meth.template
+/*---
+description: A trailing comma should not increase the arguments.length, using multiple args (static class declaration private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [async-iteration, class, class-methods-private]
+flags: [generated, async]
+info: |
+    ClassDeclaration : class BindingIdentifier ClassTail
+
+    1. Let className be StringValue of BindingIdentifier.
+    2. Let value be the result of ClassDefinitionEvaluation of ClassTail with
+       argument className.
+    [...]
+
+    14.5.14 Runtime Semantics: ClassDefinitionEvaluation
+
+    21. For each ClassElement m in order from methods
+        a. If IsStatic of m is false, then
+           i. Let status be the result of performing
+              PropertyDefinitionEvaluation for m with arguments proto and
+              false.
+        [...]
+
+    Runtime Semantics: PropertyDefinitionEvaluation
+
+    AsyncGeneratorMethod :
+        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
+            { AsyncGeneratorBody }
+
+    1. Let propKey be the result of evaluating PropertyName.
+    2. ReturnIfAbrupt(propKey).
+    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
+       Otherwise let strict be false.
+    4. Let scope be the running execution context's LexicalEnvironment.
+    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
+       AsyncGeneratorBody, scope, strict).
+    [...]
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+var callCount = 0;
+class C {
+  async * #method() {
+    assert.sameValue(arguments.length, 2);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 'TC39');
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(42, 'TC39',).next().then(() => {
+    assert.sameValue(callCount, 1, 'method invoked exactly once');
+}).then($DONE, $DONE);

test/language/arguments-object/cls-decl-async-private-gen-meth-args-trailing-comma-null.js

@@ -0,0 +1,74 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-null.case
+// - src/arguments/default/cls-decl-async-private-gen-meth.template
+/*---
+description: A trailing comma after null should not increase the arguments.length (static class declaration private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [async-iteration, class, class-methods-private]
+flags: [generated, async]
+info: |
+    ClassDeclaration : class BindingIdentifier ClassTail
+
+    1. Let className be StringValue of BindingIdentifier.
+    2. Let value be the result of ClassDefinitionEvaluation of ClassTail with
+       argument className.
+    [...]
+
+    14.5.14 Runtime Semantics: ClassDefinitionEvaluation
+
+    21. For each ClassElement m in order from methods
+        a. If IsStatic of m is false, then
+           i. Let status be the result of performing
+              PropertyDefinitionEvaluation for m with arguments proto and
+              false.
+        [...]
+
+    Runtime Semantics: PropertyDefinitionEvaluation
+
+    AsyncGeneratorMethod :
+        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
+            { AsyncGeneratorBody }
+
+    1. Let propKey be the result of evaluating PropertyName.
+    2. ReturnIfAbrupt(propKey).
+    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
+       Otherwise let strict be false.
+    4. Let scope be the running execution context's LexicalEnvironment.
+    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
+       AsyncGeneratorBody, scope, strict).
+    [...]
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+var callCount = 0;
+class C {
+  async * #method() {
+    assert.sameValue(arguments.length, 2);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], null);
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(42, null,).next().then(() => {
+    assert.sameValue(callCount, 1, 'method invoked exactly once');
+}).then($DONE, $DONE);

test/language/arguments-object/cls-decl-async-private-gen-meth-args-trailing-comma-single-args.js

@@ -0,0 +1,73 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-single-args.case
+// - src/arguments/default/cls-decl-async-private-gen-meth.template
+/*---
+description: A trailing comma should not increase the arguments.length, using a single arg (static class declaration private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [async-iteration, class, class-methods-private]
+flags: [generated, async]
+info: |
+    ClassDeclaration : class BindingIdentifier ClassTail
+
+    1. Let className be StringValue of BindingIdentifier.
+    2. Let value be the result of ClassDefinitionEvaluation of ClassTail with
+       argument className.
+    [...]
+
+    14.5.14 Runtime Semantics: ClassDefinitionEvaluation
+
+    21. For each ClassElement m in order from methods
+        a. If IsStatic of m is false, then
+           i. Let status be the result of performing
+              PropertyDefinitionEvaluation for m with arguments proto and
+              false.
+        [...]
+
+    Runtime Semantics: PropertyDefinitionEvaluation
+
+    AsyncGeneratorMethod :
+        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
+            { AsyncGeneratorBody }
+
+    1. Let propKey be the result of evaluating PropertyName.
+    2. ReturnIfAbrupt(propKey).
+    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
+       Otherwise let strict be false.
+    4. Let scope be the running execution context's LexicalEnvironment.
+    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
+       AsyncGeneratorBody, scope, strict).
+    [...]
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+var callCount = 0;
+class C {
+  async * #method() {
+    assert.sameValue(arguments.length, 1);
+    assert.sameValue(arguments[0], 42);
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(42,).next().then(() => {
+    assert.sameValue(callCount, 1, 'method invoked exactly once');
+}).then($DONE, $DONE);

test/language/arguments-object/cls-decl-async-private-gen-meth-args-trailing-comma-spread-operator.js

@@ -0,0 +1,78 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-spread-operator.case
+// - src/arguments/default/cls-decl-async-private-gen-meth.template
+/*---
+description: A trailing comma should not increase the arguments.length, using spread args (static class declaration private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [async-iteration, class, class-methods-private]
+flags: [generated, async]
+info: |
+    ClassDeclaration : class BindingIdentifier ClassTail
+
+    1. Let className be StringValue of BindingIdentifier.
+    2. Let value be the result of ClassDefinitionEvaluation of ClassTail with
+       argument className.
+    [...]
+
+    14.5.14 Runtime Semantics: ClassDefinitionEvaluation
+
+    21. For each ClassElement m in order from methods
+        a. If IsStatic of m is false, then
+           i. Let status be the result of performing
+              PropertyDefinitionEvaluation for m with arguments proto and
+              false.
+        [...]
+
+    Runtime Semantics: PropertyDefinitionEvaluation
+
+    AsyncGeneratorMethod :
+        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
+            { AsyncGeneratorBody }
+
+    1. Let propKey be the result of evaluating PropertyName.
+    2. ReturnIfAbrupt(propKey).
+    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
+       Otherwise let strict be false.
+    4. Let scope be the running execution context's LexicalEnvironment.
+    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
+       AsyncGeneratorBody, scope, strict).
+    [...]
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+var arr = [2, 3];
+
+
+var callCount = 0;
+class C {
+  async * #method() {
+    assert.sameValue(arguments.length, 4);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 1);
+    assert.sameValue(arguments[2], 2);
+    assert.sameValue(arguments[3], 3);
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(42, ...[1], ...arr,).next().then(() => {
+    assert.sameValue(callCount, 1, 'method invoked exactly once');
+}).then($DONE, $DONE);

test/language/arguments-object/cls-decl-async-private-gen-meth-args-trailing-comma-undefined.js

@@ -0,0 +1,74 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-undefined.case
+// - src/arguments/default/cls-decl-async-private-gen-meth.template
+/*---
+description: A trailing comma after undefined should not increase the arguments.length (static class declaration private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [async-iteration, class, class-methods-private]
+flags: [generated, async]
+info: |
+    ClassDeclaration : class BindingIdentifier ClassTail
+
+    1. Let className be StringValue of BindingIdentifier.
+    2. Let value be the result of ClassDefinitionEvaluation of ClassTail with
+       argument className.
+    [...]
+
+    14.5.14 Runtime Semantics: ClassDefinitionEvaluation
+
+    21. For each ClassElement m in order from methods
+        a. If IsStatic of m is false, then
+           i. Let status be the result of performing
+              PropertyDefinitionEvaluation for m with arguments proto and
+              false.
+        [...]
+
+    Runtime Semantics: PropertyDefinitionEvaluation
+
+    AsyncGeneratorMethod :
+        async [no LineTerminator here] * PropertyName ( UniqueFormalParameters )
+            { AsyncGeneratorBody }
+
+    1. Let propKey be the result of evaluating PropertyName.
+    2. ReturnIfAbrupt(propKey).
+    3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true.
+       Otherwise let strict be false.
+    4. Let scope be the running execution context's LexicalEnvironment.
+    5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters,
+       AsyncGeneratorBody, scope, strict).
+    [...]
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+var callCount = 0;
+class C {
+  async * #method() {
+    assert.sameValue(arguments.length, 2);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], undefined);
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(42, undefined,).next().then(() => {
+    assert.sameValue(callCount, 1, 'method invoked exactly once');
+}).then($DONE, $DONE);

test/language/arguments-object/cls-decl-async-private-gen-meth-static-args-trailing-comma-multiple.js

@@ -0,0 +1,55 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-multiple.case
+// - src/arguments/default/cls-decl-async-private-gen-meth-static.template
+/*---
+description: A trailing comma should not increase the arguments.length, using multiple args (static class expression private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [async-iteration, class, class-static-methods-private]
+flags: [generated, async]
+info: |
+    Arguments :
+      ( )
+      ( ArgumentList )
+      ( ArgumentList , )
+
+    ArgumentList :
+      AssignmentExpression
+      ... AssignmentExpression
+      ArgumentList , AssignmentExpression
+      ArgumentList , ... AssignmentExpression
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  static async * #method() {
+    assert.sameValue(arguments.length, 2);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 'TC39');
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+      return this.#method;
+  }
+}
+
+C.method(42, 'TC39',).next().then(() => {
+    assert.sameValue(callCount, 1, 'method invoked exactly once');
+}).then($DONE, $DONE);

test/language/arguments-object/cls-decl-async-private-gen-meth-static-args-trailing-comma-null.js

@@ -0,0 +1,55 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-null.case
+// - src/arguments/default/cls-decl-async-private-gen-meth-static.template
+/*---
+description: A trailing comma after null should not increase the arguments.length (static class expression private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [async-iteration, class, class-static-methods-private]
+flags: [generated, async]
+info: |
+    Arguments :
+      ( )
+      ( ArgumentList )
+      ( ArgumentList , )
+
+    ArgumentList :
+      AssignmentExpression
+      ... AssignmentExpression
+      ArgumentList , AssignmentExpression
+      ArgumentList , ... AssignmentExpression
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  static async * #method() {
+    assert.sameValue(arguments.length, 2);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], null);
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+      return this.#method;
+  }
+}
+
+C.method(42, null,).next().then(() => {
+    assert.sameValue(callCount, 1, 'method invoked exactly once');
+}).then($DONE, $DONE);

test/language/arguments-object/cls-decl-async-private-gen-meth-static-args-trailing-comma-single-args.js

@@ -0,0 +1,54 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-single-args.case
+// - src/arguments/default/cls-decl-async-private-gen-meth-static.template
+/*---
+description: A trailing comma should not increase the arguments.length, using a single arg (static class expression private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [async-iteration, class, class-static-methods-private]
+flags: [generated, async]
+info: |
+    Arguments :
+      ( )
+      ( ArgumentList )
+      ( ArgumentList , )
+
+    ArgumentList :
+      AssignmentExpression
+      ... AssignmentExpression
+      ArgumentList , AssignmentExpression
+      ArgumentList , ... AssignmentExpression
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  static async * #method() {
+    assert.sameValue(arguments.length, 1);
+    assert.sameValue(arguments[0], 42);
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+      return this.#method;
+  }
+}
+
+C.method(42,).next().then(() => {
+    assert.sameValue(callCount, 1, 'method invoked exactly once');
+}).then($DONE, $DONE);

test/language/arguments-object/cls-decl-async-private-gen-meth-static-args-trailing-comma-spread-operator.js

@@ -0,0 +1,59 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-spread-operator.case
+// - src/arguments/default/cls-decl-async-private-gen-meth-static.template
+/*---
+description: A trailing comma should not increase the arguments.length, using spread args (static class expression private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [async-iteration, class, class-static-methods-private]
+flags: [generated, async]
+info: |
+    Arguments :
+      ( )
+      ( ArgumentList )
+      ( ArgumentList , )
+
+    ArgumentList :
+      AssignmentExpression
+      ... AssignmentExpression
+      ArgumentList , AssignmentExpression
+      ArgumentList , ... AssignmentExpression
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+var arr = [2, 3];
+
+
+
+var callCount = 0;
+class C {
+  static async * #method() {
+    assert.sameValue(arguments.length, 4);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 1);
+    assert.sameValue(arguments[2], 2);
+    assert.sameValue(arguments[3], 3);
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+      return this.#method;
+  }
+}
+
+C.method(42, ...[1], ...arr,).next().then(() => {
+    assert.sameValue(callCount, 1, 'method invoked exactly once');
+}).then($DONE, $DONE);

test/language/arguments-object/cls-decl-async-private-gen-meth-static-args-trailing-comma-undefined.js

@@ -0,0 +1,55 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-undefined.case
+// - src/arguments/default/cls-decl-async-private-gen-meth-static.template
+/*---
+description: A trailing comma after undefined should not increase the arguments.length (static class expression private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [async-iteration, class, class-static-methods-private]
+flags: [generated, async]
+info: |
+    Arguments :
+      ( )
+      ( ArgumentList )
+      ( ArgumentList , )
+
+    ArgumentList :
+      AssignmentExpression
+      ... AssignmentExpression
+      ArgumentList , AssignmentExpression
+      ArgumentList , ... AssignmentExpression
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  static async * #method() {
+    assert.sameValue(arguments.length, 2);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], undefined);
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+      return this.#method;
+  }
+}
+
+C.method(42, undefined,).next().then(() => {
+    assert.sameValue(callCount, 1, 'method invoked exactly once');
+}).then($DONE, $DONE);

test/language/arguments-object/cls-decl-gen-meth-args-trailing-comma-multiple.js

@@ -16,9 +16,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-gen-meth-args-trailing-comma-null.js

@@ -16,9 +16,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-gen-meth-args-trailing-comma-single-args.js

@@ -16,9 +16,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-gen-meth-args-trailing-comma-spread-operator.js

@@ -0,0 +1,53 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-spread-operator.case
+// - src/arguments/default/cls-decl-gen-meth.template
+/*---
+description: A trailing comma should not increase the arguments.length, using spread args (class declaration generator method)
+esid: sec-arguments-exotic-objects
+features: [generators]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+var arr = [2, 3];
+
+
+
+var callCount = 0;
+class C {
+  *method() {
+    assert.sameValue(arguments.length, 4);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 1);
+    assert.sameValue(arguments[2], 2);
+    assert.sameValue(arguments[3], 3);
+    callCount = callCount + 1;
+  }
+}
+
+C.prototype.method(42, ...[1], ...arr,).next();
+
+// Stores a reference `ref` for case evaluation
+var ref = C.prototype.method;
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-gen-meth-args-trailing-comma-undefined.js

@@ -16,9 +16,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-gen-meth-static-args-trailing-comma-multiple.js

@@ -16,9 +16,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-gen-meth-static-args-trailing-comma-null.js

@@ -16,9 +16,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-gen-meth-static-args-trailing-comma-single-args.js

@@ -16,9 +16,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-gen-meth-static-args-trailing-comma-spread-operator.js

@@ -0,0 +1,53 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-spread-operator.case
+// - src/arguments/default/cls-decl-gen-meth-static.template
+/*---
+description: A trailing comma should not increase the arguments.length, using spread args (class declaration generator method)
+esid: sec-arguments-exotic-objects
+features: [generators]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+var arr = [2, 3];
+
+
+
+var callCount = 0;
+class C {
+  static *method() {
+    assert.sameValue(arguments.length, 4);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 1);
+    assert.sameValue(arguments[2], 2);
+    assert.sameValue(arguments[3], 3);
+    callCount = callCount + 1;
+  }
+}
+
+C.method(42, ...[1], ...arr,).next();
+
+// Stores a reference `ref` for case evaluation
+var ref = C.method;
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-gen-meth-static-args-trailing-comma-undefined.js

@@ -16,9 +16,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-meth-args-trailing-comma-multiple.js

@@ -14,9 +14,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-meth-args-trailing-comma-null.js

@@ -14,9 +14,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-meth-args-trailing-comma-single-args.js

@@ -14,9 +14,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-meth-args-trailing-comma-spread-operator.js

@@ -0,0 +1,51 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-spread-operator.case
+// - src/arguments/default/cls-decl-meth.template
+/*---
+description: A trailing comma should not increase the arguments.length, using spread args (class declaration method)
+esid: sec-arguments-exotic-objects
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+var arr = [2, 3];
+
+
+
+var callCount = 0;
+class C {
+  method() {
+    assert.sameValue(arguments.length, 4);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 1);
+    assert.sameValue(arguments[2], 2);
+    assert.sameValue(arguments[3], 3);
+    callCount = callCount + 1;
+  }
+}
+
+C.prototype.method(42, ...[1], ...arr,);
+
+// Stores a reference `ref` for case evaluation
+var ref = C.prototype.method;
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-meth-args-trailing-comma-undefined.js

@@ -14,9 +14,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-meth-static-args-trailing-comma-multiple.js

@@ -14,9 +14,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-meth-static-args-trailing-comma-null.js

@@ -14,9 +14,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-meth-static-args-trailing-comma-single-args.js

@@ -14,9 +14,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-meth-static-args-trailing-comma-spread-operator.js

@@ -0,0 +1,51 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-spread-operator.case
+// - src/arguments/default/cls-decl-meth-static.template
+/*---
+description: A trailing comma should not increase the arguments.length, using spread args (static class declaration method)
+esid: sec-arguments-exotic-objects
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+var arr = [2, 3];
+
+
+
+var callCount = 0;
+class C {
+  static method() {
+    assert.sameValue(arguments.length, 4);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 1);
+    assert.sameValue(arguments[2], 2);
+    assert.sameValue(arguments[3], 3);
+    callCount = callCount + 1;
+  }
+}
+
+C.method(42, ...[1], ...arr,);
+
+// Stores a reference `ref` for case evaluation
+var ref = C.method;
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-meth-static-args-trailing-comma-undefined.js

@@ -14,9 +14,18 @@ info: |
 
     Trailing comma in the arguments list
 
-    12.3 Left-Hand-Side Expressions
+    Left-Hand-Side Expressions
 
-    Arguments[Yield, Await] : ( ArgumentList[?Yield, ?Await] , )
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
 ---*/
 
 

test/language/arguments-object/cls-decl-private-gen-meth-args-trailing-comma-multiple.js

@@ -0,0 +1,50 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-multiple.case
+// - src/arguments/default/cls-decl-private-gen-meth.template
+/*---
+description: A trailing comma should not increase the arguments.length, using multiple args (class declaration private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [generators, class, class-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  * #method() {
+    assert.sameValue(arguments.length, 2);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 'TC39');
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(42, 'TC39',).next();
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-gen-meth-args-trailing-comma-null.js

@@ -0,0 +1,50 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-null.case
+// - src/arguments/default/cls-decl-private-gen-meth.template
+/*---
+description: A trailing comma after null should not increase the arguments.length (class declaration private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [generators, class, class-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  * #method() {
+    assert.sameValue(arguments.length, 2);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], null);
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(42, null,).next();
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-gen-meth-args-trailing-comma-single-args.js

@@ -0,0 +1,49 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-single-args.case
+// - src/arguments/default/cls-decl-private-gen-meth.template
+/*---
+description: A trailing comma should not increase the arguments.length, using a single arg (class declaration private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [generators, class, class-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  * #method() {
+    assert.sameValue(arguments.length, 1);
+    assert.sameValue(arguments[0], 42);
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(42,).next();
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-gen-meth-args-trailing-comma-spread-operator.js

@@ -0,0 +1,54 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-spread-operator.case
+// - src/arguments/default/cls-decl-private-gen-meth.template
+/*---
+description: A trailing comma should not increase the arguments.length, using spread args (class declaration private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [generators, class, class-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+var arr = [2, 3];
+
+
+
+var callCount = 0;
+class C {
+  * #method() {
+    assert.sameValue(arguments.length, 4);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 1);
+    assert.sameValue(arguments[2], 2);
+    assert.sameValue(arguments[3], 3);
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(42, ...[1], ...arr,).next();
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-gen-meth-args-trailing-comma-undefined.js

@@ -0,0 +1,50 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-undefined.case
+// - src/arguments/default/cls-decl-private-gen-meth.template
+/*---
+description: A trailing comma after undefined should not increase the arguments.length (class declaration private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [generators, class, class-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  * #method() {
+    assert.sameValue(arguments.length, 2);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], undefined);
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(42, undefined,).next();
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-gen-meth-static-args-trailing-comma-multiple.js

@@ -0,0 +1,50 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-multiple.case
+// - src/arguments/default/cls-decl-private-gen-meth-static.template
+/*---
+description: A trailing comma should not increase the arguments.length, using multiple args (class declaration private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [generators, class, class-static-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  static * #method() {
+    assert.sameValue(arguments.length, 2);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 'TC39');
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+    return this.#method;
+  }
+}
+
+C.method(42, 'TC39',).next();
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-gen-meth-static-args-trailing-comma-null.js

@@ -0,0 +1,50 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-null.case
+// - src/arguments/default/cls-decl-private-gen-meth-static.template
+/*---
+description: A trailing comma after null should not increase the arguments.length (class declaration private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [generators, class, class-static-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  static * #method() {
+    assert.sameValue(arguments.length, 2);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], null);
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+    return this.#method;
+  }
+}
+
+C.method(42, null,).next();
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-gen-meth-static-args-trailing-comma-single-args.js

@@ -0,0 +1,49 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-single-args.case
+// - src/arguments/default/cls-decl-private-gen-meth-static.template
+/*---
+description: A trailing comma should not increase the arguments.length, using a single arg (class declaration private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [generators, class, class-static-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  static * #method() {
+    assert.sameValue(arguments.length, 1);
+    assert.sameValue(arguments[0], 42);
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+    return this.#method;
+  }
+}
+
+C.method(42,).next();
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-gen-meth-static-args-trailing-comma-spread-operator.js

@@ -0,0 +1,54 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-spread-operator.case
+// - src/arguments/default/cls-decl-private-gen-meth-static.template
+/*---
+description: A trailing comma should not increase the arguments.length, using spread args (class declaration private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [generators, class, class-static-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+var arr = [2, 3];
+
+
+
+var callCount = 0;
+class C {
+  static * #method() {
+    assert.sameValue(arguments.length, 4);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 1);
+    assert.sameValue(arguments[2], 2);
+    assert.sameValue(arguments[3], 3);
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+    return this.#method;
+  }
+}
+
+C.method(42, ...[1], ...arr,).next();
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-gen-meth-static-args-trailing-comma-undefined.js

@@ -0,0 +1,50 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-undefined.case
+// - src/arguments/default/cls-decl-private-gen-meth-static.template
+/*---
+description: A trailing comma after undefined should not increase the arguments.length (class declaration private generator method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [generators, class, class-static-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  static * #method() {
+    assert.sameValue(arguments.length, 2);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], undefined);
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+    return this.#method;
+  }
+}
+
+C.method(42, undefined,).next();
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-meth-args-trailing-comma-multiple.js

@@ -0,0 +1,50 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-multiple.case
+// - src/arguments/default/cls-decl-private-meth.template
+/*---
+description: A trailing comma should not increase the arguments.length, using multiple args (class declaration private method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [class, class-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  #method() {
+    assert.sameValue(arguments.length, 2);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 'TC39');
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(42, 'TC39',);
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-meth-args-trailing-comma-null.js

@@ -0,0 +1,50 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-null.case
+// - src/arguments/default/cls-decl-private-meth.template
+/*---
+description: A trailing comma after null should not increase the arguments.length (class declaration private method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [class, class-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  #method() {
+    assert.sameValue(arguments.length, 2);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], null);
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(42, null,);
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-meth-args-trailing-comma-single-args.js

@@ -0,0 +1,49 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-single-args.case
+// - src/arguments/default/cls-decl-private-meth.template
+/*---
+description: A trailing comma should not increase the arguments.length, using a single arg (class declaration private method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [class, class-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  #method() {
+    assert.sameValue(arguments.length, 1);
+    assert.sameValue(arguments[0], 42);
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(42,);
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-meth-args-trailing-comma-spread-operator.js

@@ -0,0 +1,54 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-spread-operator.case
+// - src/arguments/default/cls-decl-private-meth.template
+/*---
+description: A trailing comma should not increase the arguments.length, using spread args (class declaration private method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [class, class-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+var arr = [2, 3];
+
+
+
+var callCount = 0;
+class C {
+  #method() {
+    assert.sameValue(arguments.length, 4);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 1);
+    assert.sameValue(arguments[2], 2);
+    assert.sameValue(arguments[3], 3);
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(42, ...[1], ...arr,);
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-meth-args-trailing-comma-undefined.js

@@ -0,0 +1,50 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-undefined.case
+// - src/arguments/default/cls-decl-private-meth.template
+/*---
+description: A trailing comma after undefined should not increase the arguments.length (class declaration private method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [class, class-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  #method() {
+    assert.sameValue(arguments.length, 2);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], undefined);
+    callCount = callCount + 1;
+  }
+
+  get method() {
+    return this.#method;
+  }
+}
+
+new C().method(42, undefined,);
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-meth-static-args-trailing-comma-multiple.js

@@ -0,0 +1,50 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-multiple.case
+// - src/arguments/default/cls-decl-private-meth-static.template
+/*---
+description: A trailing comma should not increase the arguments.length, using multiple args (static class declaration private method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [class, class-static-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  static #method() {
+    assert.sameValue(arguments.length, 2);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 'TC39');
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+    return this.#method;
+  }
+}
+
+C.method(42, 'TC39',);
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-meth-static-args-trailing-comma-null.js

@@ -0,0 +1,50 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-null.case
+// - src/arguments/default/cls-decl-private-meth-static.template
+/*---
+description: A trailing comma after null should not increase the arguments.length (static class declaration private method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [class, class-static-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  static #method() {
+    assert.sameValue(arguments.length, 2);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], null);
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+    return this.#method;
+  }
+}
+
+C.method(42, null,);
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-meth-static-args-trailing-comma-single-args.js

@@ -0,0 +1,49 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-single-args.case
+// - src/arguments/default/cls-decl-private-meth-static.template
+/*---
+description: A trailing comma should not increase the arguments.length, using a single arg (static class declaration private method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [class, class-static-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  static #method() {
+    assert.sameValue(arguments.length, 1);
+    assert.sameValue(arguments[0], 42);
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+    return this.#method;
+  }
+}
+
+C.method(42,);
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-meth-static-args-trailing-comma-spread-operator.js

@@ -0,0 +1,54 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-spread-operator.case
+// - src/arguments/default/cls-decl-private-meth-static.template
+/*---
+description: A trailing comma should not increase the arguments.length, using spread args (static class declaration private method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [class, class-static-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+var arr = [2, 3];
+
+
+
+var callCount = 0;
+class C {
+  static #method() {
+    assert.sameValue(arguments.length, 4);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], 1);
+    assert.sameValue(arguments[2], 2);
+    assert.sameValue(arguments[3], 3);
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+    return this.#method;
+  }
+}
+
+C.method(42, ...[1], ...arr,);
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');

test/language/arguments-object/cls-decl-private-meth-static-args-trailing-comma-undefined.js

@@ -0,0 +1,50 @@
+// This file was procedurally generated from the following sources:
+// - src/arguments/args-trailing-comma-undefined.case
+// - src/arguments/default/cls-decl-private-meth-static.template
+/*---
+description: A trailing comma after undefined should not increase the arguments.length (static class declaration private method)
+esid: sec-argument-lists-runtime-semantics-argumentlistevaluation
+features: [class, class-static-methods-private]
+flags: [generated]
+info: |
+    9.4.4 Arguments Exotic Objects
+
+    Most ECMAScript functions make an arguments object available to their code. Depending upon the
+    characteristics of the function definition, its arguments object is either an ordinary object
+    or an arguments exotic object.
+
+
+    Trailing comma in the arguments list
+
+    Left-Hand-Side Expressions
+
+    Arguments :
+        ( )
+        ( ArgumentList )
+        ( ArgumentList , )
+
+    ArgumentList :
+        AssignmentExpression
+        ... AssignmentExpression
+        ArgumentList , AssignmentExpression
+        ArgumentList , ... AssignmentExpression
+---*/
+
+
+var callCount = 0;
+class C {
+  static #method() {
+    assert.sameValue(arguments.length, 2);
+    assert.sameValue(arguments[0], 42);
+    assert.sameValue(arguments[1], undefined);
+    callCount = callCount + 1;
+  }
+
+  static get method() {
+    return this.#method;
+  }
+}
+
+C.method(42, undefined,);
+
+assert.sameValue(callCount, 1, 'method invoked exactly once');