1 files changed, 19 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/fields/bug1547129.js b/js/src/jit-test/tests/fields/bug1547129.js
new file mode 100644
index 0000000000..a543d58846
--- /dev/null
+++ b/js/src/jit-test/tests/fields/bug1547129.js
@@ -0,0 +1,19 @@
+load(libdir + "asserts.js");
+
+new class foo extends Array {
+  e = function() {}
+}
+
+source = `new class bar extends Promise { e = function() {} }`;
+// Calling the Promise constructor with empty args fails with TypeError.
+assertThrowsInstanceOf(() => eval(source), TypeError);
+
+class Base {
+  constructor() {
+    return new Proxy({}, {});
+  }
+}
+
+new class prox extends Base {
+  e = function () {}
+}