[1 of 2] Processing p
  [1 of 1] Compiling A[sig]           ( p/A.hsig, nothing )
[2 of 2] Processing q
  [1 of 3] Compiling B[sig]           ( q/B.hsig, nothing )
  [2 of 3] Compiling M                ( q/M.hs, nothing )
  [3 of 3] Instantiating p