Strict mode Failing
Expected no error, got SyntaxError: async generators are unsupported
non-Strict mode Failing
Expected no error, got SyntaxError: async generators are unsupported
Features:
- async-iteration
- class
- Proxy
Expected no error, got SyntaxError: async generators are unsupported
Expected no error, got SyntaxError: async generators are unsupported
// 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 {}
});