[1 of 3] Processing p
  [1 of 1] Compiling A[sig]           ( p/A.hsig, nothing )
[2 of 3] Processing q
  [1 of 1] Compiling A[sig]           ( q/A.hsig, nothing )
[3 of 3] Processing r
  [1 of 4] Compiling A[sig]           ( r/A.hsig, nothing )
  [2 of 4] Compiling M                ( r/M.hs, nothing )
  [3 of 4] Instantiating p
  [4 of 4] Instantiating q