1 files changed, 10 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/for-of/arrays-growing-2.js b/js/src/jit-test/tests/for-of/arrays-growing-2.js
new file mode 100644
index 0000000000..e9867714ce
--- /dev/null
+++ b/js/src/jit-test/tests/for-of/arrays-growing-2.js
@@ -0,0 +1,10 @@
+// Inserting values in an array does not change the next index of an existing iterator.
+
+var a = [1, 2, 3, 4];
+var s = '';
+for (var v of a) {
+    s += v;
+    if (s.length === 2)
+        a.unshift('x');
+}
+assertEq(s, '12234');