1 files changed, 19 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/module-code/early-dup-lex.js b/js/src/tests/test262/language/module-code/early-dup-lex.js
new file mode 100644
index 0000000000..055ef63fee
--- /dev/null
+++ b/js/src/tests/test262/language/module-code/early-dup-lex.js
@@ -0,0 +1,19 @@
+// |reftest| error:SyntaxError module
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-module-semantics-static-semantics-early-errors
+description: >
+    It is a Syntax Error if the LexicallyDeclaredNames of ModuleItemList
+    contains any duplicate entries.
+flags: [module]
+features: [let, const]
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+
+let x;
+const x = 0;