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// Copyright 2017 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.
// Flags: --allow-natives-syntax --expose-gc
function* gen() {}
(function warmup() {
for (var i = 0; i < 100; ++i) {
var g = gen();
g.p = 42;
}
})();
gc(); // Ensure no instance alive.
gen(); // Still has unused fields.
%OptimizeFunctionOnNextCall(gen);
gen(); // Was shrunk, boom!
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