1 files changed, 38 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/prototype/exec/y-fail-lastindex-no-write.js b/js/src/tests/test262/built-ins/RegExp/prototype/exec/y-fail-lastindex-no-write.js
new file mode 100644
index 0000000000..5c353da177
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/prototype/exec/y-fail-lastindex-no-write.js
@@ -0,0 +1,38 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Match failure with non-writable `lastIndex` property
+es6id: 21.2.5.2
+info: |
+    21.2.5.2 RegExp.prototype.exec ( string )
+
+    [...]
+    6. Return RegExpBuiltinExec(R, S).
+
+    21.2.5.2.2 Runtime Semantics: RegExpBuiltinExec ( R, S )
+
+    [...]
+    4. Let lastIndex be ToLength(Get(R,"lastIndex")).
+    [...]
+    8. Let sticky be ToBoolean(Get(R, "sticky")).
+    [...]
+    15. Repeat, while matchSucceeded is false
+        [...]
+        b. Let r be matcher(S, lastIndex).
+        c. If r is failure, then
+           i. If sticky is true, then
+              1. Let setStatus be Set(R, "lastIndex", 0, true).
+              2. ReturnIfAbrupt(setStatus).
+---*/
+
+var r = /c/y;
+Object.defineProperty(r, 'lastIndex', {
+  writable: false
+});
+
+assert.throws(TypeError, function() {
+  r.exec('abc');
+});
+
+reportCompare(0, 0);