v8/test/mjsunit/regress/regress-2987.js

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// Flags: --allow-natives-syntax

// This tests that stores on captured objects are correctly tracked even
// when DCE is enabled. We cannot delete simulations of captured objects
// that are still needed to replay the environment correctly.

function constructor() {
  this.x = 0;
}

var deopt = { deopt:false };
function boogeyman(mode, value) {
  var object = new constructor();
  if (mode) {
    object.x = 1;
  } else {
    object.x = 2;
  }
  deopt.deopt;
  assertEquals(value, object.x);
}

boogeyman(true, 1);
boogeyman(true, 1);
boogeyman(false, 2);
boogeyman(false, 2);
%OptimizeFunctionOnNextCall(boogeyman);
boogeyman(false, 2);
delete deopt.deopt;
boogeyman(false, 2);