v8/test/mjsunit/regress/regress-6941.js

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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 --opt
function foo(x) {
return Symbol.iterator == x;
}
%PrepareFunctionForOptimization(foo);
function main() {
foo(Symbol());
foo({valueOf() { return Symbol.toPrimitive}});
}
%NeverOptimizeFunction(main);
main();
%OptimizeFunctionOnNextCall(foo);
main();
assertOptimized(foo);