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// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 25.2.1
description: Subclassing GeneratorFunction
info: |
25.2.1 The GeneratorFunction Constructor
...
GeneratorFunction is designed to be subclassable. It may be used as the value
of an extends clause of a class definition. Subclass constructors that intend
to inherit the specified GeneratorFunction behaviour must include a super call
to the GeneratorFunction constructor to create and initialize subclass
instances with the internal slots necessary for built-in GeneratorFunction
behaviour.
...
---*/
var GeneratorFunction = Object.getPrototypeOf(function* () {}).constructor;
class Gfn extends GeneratorFunction {}
var gfn = new Gfn('a', 'yield a; yield a * 2;');
var iter = gfn(42);
assert.sameValue(iter.next().value, 42);
assert.sameValue(iter.next().value, 84);
reportCompare(0, 0);