test/mjsunit/regress/regress-1210.js

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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.
for (var i = 0; i < 1000000; ++i) test(0);
%OptimizeFunctionOnNextCall(test);
test(0);

a = "hello";
test(0);