WALA/com.ibm.wala.cast.js.test/examples-src/tests/forin.js

function testForIn( x ) {
  var z;
  for(var y in x) {
    z = (x[y])();
  }
}

testForIn({
  foo: function testForIn1() { return 7; },
  bar: function testForIn2() { return "whatever"; }
});