v8/test/mjsunit/compiler/deopt-lazy-var-mutation.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
var x = 1;
var y = 1;
function g(a) {
x = a;
y = a;
}
%NeverOptimizeFunction(g);
function foo(a) {
g(a);
return x + y;
}
var o = 1;
assertEquals(foo(o), 2);
assertEquals(foo(o), 2);
%OptimizeFunctionOnNextCall(foo);
o = 2;
assertEquals(foo(o), 4);