1 files changed, 7 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/ion/bug1620203.js b/js/src/jit-test/tests/ion/bug1620203.js
new file mode 100644
index 0000000000..c261d5ca0a
--- /dev/null
+++ b/js/src/jit-test/tests/ion/bug1620203.js
@@ -0,0 +1,7 @@
+"use strict";
+var proxy = new Proxy({}, {
+    defineProperty(target, [...x27], ...[{p10: q34}]) {
+        return true;
+    }
+});
+Object.defineProperty(proxy, "test", {writable: false});