v8/test/mjsunit/regress/regress-2843.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// Flags: --allow-natives-syntax

function bailout() { throw "bailout"; }
var global;

function foo(x, fun) {
  var a = x + 1;
  var b = x + 2;  // Need another Simulate to fold the first one into.
  global = true;  // Need a side effect to deopt to.
  fun();
  return a;
}
%PrepareFunctionForOptimization(foo);

%PrepareFunctionForOptimization(foo);
assertThrows("foo(1, bailout)");
assertThrows("foo(1, bailout)");
%OptimizeFunctionOnNextCall(foo);
assertThrows("foo(1, bailout)");
assertEquals(2, foo(1, function() {}));