resource fun()
  op f(int x) returns int  z
  op g(int y) returns int  z
  process p  {
    int a = f(1); write(a)
  }
  proc f(x) returns z  {
    forward g(2*x)
       # continue executing, perhaps changing x
  }
  proc g(y) returns z  {
    z = y+10
  }
end