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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: [GHC-15843]
    • 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