Repro: Run this on chrome's new tab (or some other page that it works on)

    async function getResponseSize(url) {

      function doThat() {
        debugger;
        const value = result.value;
        total += value.length;
        console.log('Received chunk', value);
      }

      async function getStuff() {
        while ((result = await reader.read()) && !result.done) {
          doThat();
        }
      }

      const response = await fetch(url);
      const reader = response.body.getReader();
      let result;
      let total = 0;

      total = getStuff()

      return total;
    }

    getResponseSize('/');


Functions get duplicated in the callstack. 
Not too bad, but kinda annoying.
 

Deleted: Screen Shot 2016-10-07 at 12.37.57 PM.png 37.6 KB

	Screen Shot 2016-10-07 at 12.37.57 PM.png 37.6 KB View Download