1 files changed, 61 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/class/async-method/rest-params-trailing-comma-early-error.js b/js/src/tests/test262/language/statements/class/async-method/rest-params-trailing-comma-early-error.js
new file mode 100644
index 0000000000..0599033ac7
--- /dev/null
+++ b/js/src/tests/test262/language/statements/class/async-method/rest-params-trailing-comma-early-error.js
@@ -0,0 +1,61 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/function-forms/rest-params-trailing-comma-early-error.case
+// - src/function-forms/syntax/cls-decl-async-meth.template
+/*---
+description: It's a syntax error if a FunctionRestParameter is followed by a trailing comma (class declaration async method)
+esid: sec-class-definitions-runtime-semantics-evaluation
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+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
+
+    AsyncMethod : async PropertyName ( UniqueFormalParameters ) { AsyncFunctionBody }
+
+    1. Let propKey be the result of evaluating PropertyName.
+    2. ReturnIfAbrupt(propKey).
+    3. If the function code for this AsyncMethod is strict mode code, let strict be true. Otherwise
+       let strict be false.
+    4. Let scope be the LexicalEnvironment of the running execution context.
+    5. Let closure be ! AsyncFunctionCreate(Method, UniqueFormalParameters, AsyncFunctionBody,
+       scope, strict).
+    [...]
+
+
+    Trailing comma in the parameters list
+
+    14.1 Function Definitions
+
+    FormalParameters[Yield, Await] :
+        [empty]
+        FunctionRestParameter[?Yield, ?Await]
+        FormalParameterList[?Yield, ?Await]
+        FormalParameterList[?Yield, ?Await] ,
+        FormalParameterList[?Yield, ?Await] , FunctionRestParameter[?Yield, ?Await]
+---*/
+$DONOTEVALUATE();
+
+
+class C {
+  async method(...a,) {
+    
+  }
+}