1 files changed, 15 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/ion/bug904315.js b/js/src/jit-test/tests/ion/bug904315.js
new file mode 100644
index 000000000..64239408f
--- /dev/null
+++ b/js/src/jit-test/tests/ion/bug904315.js
@@ -0,0 +1,15 @@
+
+function g(o, idx, exp) {
+    for (var i=0; i<3000; i++) {
+	assertEq(o[idx], exp);
+    }
+}
+function f() {
+    var o = [];
+    for (var i=1; i<100; i++) {
+	o[-i] = 1;
+    }
+    g(o, 50, undefined);
+    g(o, -50, 1);
+}
+f();