test/mjsunit/regress/regress-606021.js

// Copyright 2016 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

function foo() {
  return function(c) {
    var double_var = [3.0, 3.5][0];
    var literal = c ? [1, double_var] : [double_var, 3.5];
    return literal[0];
  };
}

var f1 = foo();
var f2 = foo();

// Both closures point to full code.
f1(false);
f2(false);

// Optimize f1, but don't initialize the [1, double_var] literal.
%OptimizeFunctionOnNextCall(f1);
f1(false);

// Initialize the [1, double_var] literal, and transition the boilerplate to
// double.
f2(true);

// Trick crankshaft into writing double_var at the wrong position.
var l = f1(true);
assertEquals(1, l);