v8/test/mjsunit/regress/regress-1210.js

// Copyright 2011 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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// Flags: --allow-natives-syntax

// Deoptimization of the key expression in an arguments access should see
// the arguments object as the value of the receiver.

var a = 0;

function observe(x, y) {
  return x;
}

function side_effect(x) {
  a = x;
}

function test() {
  // We will trigger deoptimization of 'a + 0' which should bail out to
  // immediately after the call to 'side_effect' (i.e., still in the key
  // subexpression of the arguments access).
  return observe(a, arguments[(side_effect(a), a + 0)]);
}

// Run enough to optimize assuming global 'a' is a smi.
;
%PrepareFunctionForOptimization(test);
for (var i = 0; i < 10; ++i) test(0);
%OptimizeFunctionOnNextCall(test);
test(0);

a = "hello";
test(0);