1 files changed, 17 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/warp/null-not-zero-index.js b/js/src/jit-test/tests/warp/null-not-zero-index.js
new file mode 100644
index 0000000000..b55b743b95
--- /dev/null
+++ b/js/src/jit-test/tests/warp/null-not-zero-index.js
@@ -0,0 +1,17 @@
+// |jit-test| --no-threads
+
+function f(index) {
+  var a = [123];
+  return a[index]
+}
+
+function g() {
+  for (var i = 0; i < 100; i++) {
+    // Make sure |null| is not treated like a |0| index.
+    assertEq(f(i > 90 ? null : 0), i > 90 ? undefined : 123)
+  }
+}
+
+for (var j = 0; j < 10; j++) {
+  g();
+}