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[1 of 2] Processing p
  [1 of 2] Compiling H[sig]           ( p\H.hsig, nothing )
  [2 of 2] Compiling I                ( p\I.hs, nothing )
[2 of 2] Processing q
  [1 of 4] Compiling B                ( q\B.hs, nothing )
  [2 of 4] Compiling A[sig]           ( q\A.hsig, nothing )

bkpfail53.bkp:15:9: error: [GHC-15843]
    • Type constructor ‘T’ has conflicting definitions in the module
      and its hsig file.
      Main module: type T :: *
                   type T = B.T
        Hsig file: type T :: *
                   data T = T Int
    • while merging the signatures from:
        • p[H=<A>]:H
        • ...and the local signature for A