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

bkpfail50.bkp:7:9: error:
    • Type constructor ‘T’ has conflicting definitions in the module
      and its hsig file
      Main module: type T :: *
                   data T = T Bool
      Hsig file:  type T :: *
                  data T = T Int
      The constructors do not match: The types for ‘T’ differ
    • while merging the signatures from:
        • p[H=<A>]:H
        • ...and the local signature for A