1 files changed, 28 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Set/prototype/forEach/this-arg-explicit-cannot-override-lexical-this-arrow.js b/js/src/tests/test262/built-ins/Set/prototype/forEach/this-arg-explicit-cannot-override-lexical-this-arrow.js
new file mode 100644
index 0000000000..7c20508936
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Set/prototype/forEach/this-arg-explicit-cannot-override-lexical-this-arrow.js
@@ -0,0 +1,28 @@
+// 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-set.prototype.forEach
+description: >
+    Set.prototype.forEach ( callbackfn [ , thisArg ] )
+
+    ...
+    5. If thisArg was supplied, let T be thisArg; else let T be undefined.
+    ...
+
+    An arrow function will ignore an explicit thisArg
+
+features: [arrow-function]
+---*/
+
+var s = new Set([1]);
+var usurper = {};
+var counter = 0;
+
+s.forEach(_ => {
+  assert.notSameValue(this, usurper, "`this` is not `usurper`");
+  counter++;
+}, usurper);
+
+assert.sameValue(counter, 1, "`forEach` is not a no-op");
+
+reportCompare(0, 0);