1 files changed, 38 insertions, 0 deletions
diff --git a/js/src/tests/test262/annexB/built-ins/RegExp/prototype/compile/pattern-regexp-immutable-lastindex.js b/js/src/tests/test262/annexB/built-ins/RegExp/prototype/compile/pattern-regexp-immutable-lastindex.js
new file mode 100644
index 0000000000..cb69aaa439
--- /dev/null
+++ b/js/src/tests/test262/annexB/built-ins/RegExp/prototype/compile/pattern-regexp-immutable-lastindex.js
@@ -0,0 +1,38 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-regexp.prototype.compile
+es6id: B.2.5.1
+description: Behavior when `lastIndex` property of "this" value is non-writable
+info: |
+    [...]
+    3. If Type(pattern) is Object and pattern has a [[RegExpMatcher]] internal
+       slot, then
+       a. If flags is not undefined, throw a TypeError exception.
+       b. Let P be the value of pattern's [[OriginalSource]] internal slot.
+       c. Let F be the value of pattern's [[OriginalFlags]] internal slot.
+    4. Else,
+       [...]
+    5. Return ? RegExpInitialize(O, P, F).
+
+    21.2.3.2.2 Runtime Semantics: RegExpInitialize
+
+    [...]
+    12. Perform ? Set(obj, "lastIndex", 0, true).
+---*/
+
+var subject = /initial/;
+Object.defineProperty(subject, 'lastIndex', { value: 45, writable: false });
+
+assert.throws(TypeError, function() {
+  subject.compile(/updated/gi);
+});
+
+assert.sameValue(
+  subject.toString(),
+  new RegExp('updated', 'gi').toString(),
+  '[[OriginalSource]] internal slot'
+);
+assert.sameValue(subject.lastIndex, 45);
+
+reportCompare(0, 0);