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

<no location info>: error:
    The identifier T does not exist in the signature for <A>
    (Try adding it to the export list in that hsig file.)