Computation graph

Tips for drawing a computation graph from code:

s1;
finish { // F1-Start
  async s2;
  finish { // F2-Start
    async s3;
    async s4;
    s5;
  } // F2-End
  async s6;
  s7;
} // F1-End
 s8;

1) Draw out the continuation spine:

2) then fill in the rest of the nodes.