Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    function closedOver(){
    
    }
    
    function a(){
      this.closedOver = this.closedOver || closedOver;
      this.closedOver()
    }
    a();
    
    function b(){
       closedOver();
    }
    
    function c(){
    function closedOver(){
    
    }
    closedOver();
    }
  };
</script>

Test runner

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a();

b();

closedOver();

c();

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