diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/regexp-multiline.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/regexp-multiline.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+// visibility of updates to RegExp.multiline
+
+function foo(value) {
+  for (var i = 0; i < 50; i++) {
+    var re = /erwe/;
+    assertEq(re.multiline, value);
+  }
+}
+
+foo(false);
+RegExp.multiline = true;
+foo(true);