[1 of 3] Processing p
  [1 of 2] Compiling A1[sig]          ( p/A1.hsig, nothing )
  [2 of 2] Compiling A2[sig]          ( p/A2.hsig, nothing )
[2 of 3] Processing q
  [1 of 1] Compiling A2[sig]          ( q/A2.hsig, nothing )
[3 of 3] Processing r
  [1 of 2] Compiling A1[sig]          ( r/A1.hsig, nothing )
  [2 of 2] Compiling A2[sig]          ( r/A2.hsig, nothing )