1 files changed, 18 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/pic/watch2a.js b/js/src/jit-test/tests/pic/watch2a.js
new file mode 100644
index 000000000..ce3294ba3
--- /dev/null
+++ b/js/src/jit-test/tests/pic/watch2a.js
@@ -0,0 +1,18 @@
+// assignments to watched properties via ++ must not be traced
+var hits = 0;
+function counter(id, oldval, newval) {
+    hits++;
+    return newval;
+}
+
+(function () {
+    var obj = {x: 0, y: 0};
+    var a = ['x', 'y'];
+    obj.watch('z', counter);
+    for (var i = 0; i < 14; i++) {
+        obj.watch(a[+(i > 8)], counter);
+        obj.y++;
+    }
+})();
+assertEq(hits, 5);
+