1 files changed, 7 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/ion/bug772901.js b/js/src/jit-test/tests/ion/bug772901.js
new file mode 100644
index 000000000..eb71f6afb
--- /dev/null
+++ b/js/src/jit-test/tests/ion/bug772901.js
@@ -0,0 +1,7 @@
+// vim: set ts=8 sts=4 et sw=4 tw=99:
+
+function f(x) {
+    delete ((x)++);
+    arguments[0] !== undefined;
+}
+f(1, x = [f.ArrayBuffer,unwatch.Int32Array], this, this, this) ;