regress-4945.js 275 Bytes
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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

function* g(o) {
  yield 'x' in o;
}

assertTrue(g({x: 1}).next().value);
assertFalse(g({}).next().value);