anchor.diff:          case 15:
             // join
             x = __result;
  -          __next = [13];
  +          __next.push(13);
             // goto finally
             __goto = 12;
             break;
  
positive.code:           case 13:
              // returning from await.
              __helper = __result;
              __next = [12];
              // goto finally
              __goto = 11;
              break;
  
negative.code: }
  """, """
  function(c, i) {
    var __goto = 0, __completer = new Completer(), __handler = 1, __currentError, __next = [], x, y, __error, __error1;
    function __body(__errorCode, __result) {
      if (__errorCode === 1) {
        __currentError = __result;
  