1 files changed, 14 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/bug827104.js b/js/src/jit-test/tests/basic/bug827104.js
new file mode 100644
index 0000000000..a4ae50201f
--- /dev/null
+++ b/js/src/jit-test/tests/basic/bug827104.js
@@ -0,0 +1,14 @@
+function f() {
+    var a = [];
+    for (var i = 0; i < 1000; i++) {
+      a.x = {}
+    }
+    a[i][0] = 0;
+}
+
+var e;
+try {
+    f();
+} catch (error) {e = error;}
+assertEq(e.constructor.name, "TypeError");
+assertEq(e.message.includes("a[i] is undefined"), true);