1 files changed, 14 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/ion/bug1321437.js b/js/src/jit-test/tests/ion/bug1321437.js
new file mode 100644
index 0000000000..98a60e9094
--- /dev/null
+++ b/js/src/jit-test/tests/ion/bug1321437.js
@@ -0,0 +1,14 @@
+function f(idx) {
+    "use strict";
+    let z = [0, 1, 2, 3, 4, 5, 6, 7, 8, , , ];
+    Object.freeze(z);
+    try {
+        z[idx] = 0;
+    } catch (e) {
+        return e.message;
+    }
+}
+assertEq(f(4), "4 is read-only");
+assertEq(f(-1), 'can\'t define property "-1": Array is not extensible');
+assertEq(f(9), "can't define property 9: Array is not extensible");
+assertEq(f(0xffffffff), 'can\'t define property "4294967295": Array is not extensible');