1 files changed, 10 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/for-of/arrays-slow-5.js b/js/src/jit-test/tests/for-of/arrays-slow-5.js
new file mode 100644
index 0000000000..36173e352b
--- /dev/null
+++ b/js/src/jit-test/tests/for-of/arrays-slow-5.js
@@ -0,0 +1,10 @@
+// Slowifying an array while it is being iterated does not affect iteration.
+
+var a = [9, 8, 7, 6, 5, 4, 3];
+var log = '';
+for (var x of a) {
+    log += x;
+    if (x === 6)
+        a.slow = true;
+}
+assertEq(log, "9876543");