1 files changed, 61 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/expressions/arrow-function/dflt-params-duplicates.js b/js/src/tests/test262/language/expressions/arrow-function/dflt-params-duplicates.js
new file mode 100644
index 0000000000..8ea9a7db3c
--- /dev/null
+++ b/js/src/tests/test262/language/expressions/arrow-function/dflt-params-duplicates.js
@@ -0,0 +1,61 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/function-forms/dflt-params-duplicates.case
+// - src/function-forms/syntax/arrow-function.template
+/*---
+description: It is a Syntax Error if BoundNames of FormalParameters contains any duplicate elements. (arrow function expression)
+esid: sec-arrow-function-definitions-runtime-semantics-evaluation
+features: [default-parameters]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    ArrowFunction : ArrowParameters => ConciseBody
+
+    [...]
+    4. Let closure be FunctionCreate(Arrow, parameters, ConciseBody, scope, strict).
+    [...]
+
+    9.2.1 [[Call]] ( thisArgument, argumentsList)
+
+    [...]
+    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
+    [...]
+
+    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
+
+    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
+    [...]
+
+    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
+
+    [...]
+    23. Let iteratorRecord be Record {[[iterator]]:
+        CreateListIterator(argumentsList), [[done]]: false}.
+    24. If hasDuplicates is true, then
+        [...]
+    25. Else,
+        b. Let formalStatus be IteratorBindingInitialization for formals with
+           iteratorRecord and env as arguments.
+    [...]
+
+    14.1.2 Static Semantics: Early Errors
+
+    StrictFormalParameters : FormalParameters
+
+    - It is a Syntax Error if BoundNames of FormalParameters contains any
+      duplicate elements.
+
+    FormalParameters : FormalParameterList
+
+    - It is a Syntax Error if IsSimpleParameterList of FormalParameterList is
+      false and BoundNames of FormalParameterList contains any duplicate
+      elements.
+
+---*/
+$DONOTEVALUATE();
+
+0, (x = 0, x) => {
+  
+};