test/mjsunit/compiler/complex-for-in.js

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function TestNamed(m) {
  var o = {};
  var result = [];
  for (o.p in m) result.push(o.p);
  return result;
}

assertArrayEquals(['x','y'], TestNamed({x:0, y:1}));
assertArrayEquals(['0','1'], TestNamed([1,2]));


function TestKeyed(m) {
  var a = [];
  var result = [];
  var i = 0;
  for (a[i++] in m) result.push(a[i - 1]);
  assertEquals(i, a.length);
  return result;
}


assertArrayEquals(['x','y'], TestKeyed({x:0, y:1}));
assertArrayEquals(['0','1'], TestKeyed([1,2]));