1 files changed, 14 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/warp/bug1789821.js b/js/src/jit-test/tests/warp/bug1789821.js
new file mode 100644
index 0000000000..b1d3ee9a54
--- /dev/null
+++ b/js/src/jit-test/tests/warp/bug1789821.js
@@ -0,0 +1,14 @@
+function foo(x) {
+  Math.max(...[x]);
+}
+
+with ({}) {}
+for (let i = 0; i < 100; i++) {
+  foo(0);
+}
+
+let called = false;
+const evil = { valueOf: () => { called = true; } };
+foo(evil);
+
+assertEq(called, true);