Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var f; // resulted function saved into this var 
    // instead of passing into setTimeout
  };
</script>

Test runner

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for (var i = 0; i < 10; i++) {
  (function() {
    var i2 = i;
    f = function() {
      console.log(i2);
    };
  })();
}

for (var i = 0; i < 10; i++) {
  f = (function(i2) {
    return function() {
      console.log(i2);
    };
  })(i);
}

function fGenerator(i2) {
  return function() {
    console.log(i2);
  }
}
for (var i = 0; i < 10; i++) {
  f = fGenerator(i);
}

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