v8/test/mjsunit/regress/regress-crbug-274438.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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//
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// Flags: --allow-natives-syntax

function f(a, b) {
  var x = {a: a};
  switch (b) { case 'string': }
  var y = {b: b};
  return y;
};
%PrepareFunctionForOptimization(f);
f("a", "b");
f("a", "b");
%OptimizeFunctionOnNextCall(f);
f("a", "b");
%SetAllocationTimeout(100, 0);
var killer = f("bang", "bo" + "om");
assertEquals("boom", killer.b);