v8/test/mjsunit/regress/regress-crbug-245480.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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// Flags: --allow-natives-syntax --expose-gc --noalways-opt

function isHoley(obj) {
  if (%HasFastHoleyElements(obj)) return true;
  return false;
}

function assertHoley(obj, name_opt) {
  assertEquals(true, isHoley(obj), name_opt);
}

function assertNotHoley(obj, name_opt) {
  assertEquals(false, isHoley(obj), name_opt);
}

function create_array(arg) {
  return new Array(arg);
}

obj = create_array(0);
assertNotHoley(obj);
create_array(0);
%OptimizeFunctionOnNextCall(create_array);
obj = create_array(10);
assertHoley(obj);

// The code below would assert in debug or crash in release
function f(length) {
  return new Array(length)
}

f(0);
f(0);
%OptimizeFunctionOnNextCall(f);
var a = f(10);

function g(a) {
  return a[0];
}

var b = [0];
g(b);
g(b);
assertEquals(undefined, g(a));