docs: function tasync_trace_end(args, index) {
          Future.call(this);
  
          this.caller = FRAME;
          this.position = ++FRAME.subframes;
          this.subframes = 0;
  
          if (TASYNC_TRACE_ENABLE) {
              this.trace = new Error();
          }
  
          this.args = args;
          this.index = index;
      }