[1 of 4] Processing p
  [1 of 1] Compiling A[sig]           ( p/A.hsig, nothing )
[2 of 4] Processing q
  [1 of 2] Compiling A[sig]           ( q/A.hsig, nothing )

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