1 files changed, 44 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/class/subclass/superclass-async-generator-function.js b/js/src/tests/test262/language/statements/class/subclass/superclass-async-generator-function.js
new file mode 100644
index 0000000000..d77acb6c90
--- /dev/null
+++ b/js/src/tests/test262/language/statements/class/subclass/superclass-async-generator-function.js
@@ -0,0 +1,44 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-runtime-semantics-classdefinitionevaluation
+description: >
+  IsConstructor check is performed before "prototype" lookup.
+  Async generator functions are not constructors (MakeConstructor is not called on them).
+info: |
+  ClassDefinitionEvaluation
+
+  [...]
+  5. Else,
+    [...]
+    d. Let superclass be ? GetValue(superclassRef).
+    e. If superclass is null, then
+      [...]
+    f. Else if IsConstructor(superclass) is false, throw a TypeError exception.
+features: [async-iteration, class, Proxy]
+---*/
+
+async function* fn() {}
+
+assert.throws(TypeError, function() {
+  class A extends fn {}
+});
+
+var bound = (async function* () {}).bind();
+Object.defineProperty(bound, "prototype", {
+  get: function() {
+    throw new Test262Error("`superclass.prototype` is unreachable");
+  },
+});
+
+assert.throws(TypeError, function() {
+  class C extends bound {}
+});
+
+var proxy = new Proxy(async function* () {}, {});
+
+assert.throws(TypeError, function() {
+  class C extends proxy {}
+});
+
+reportCompare(0, 0);