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[1 of 3] Processing p
  [1 of 2] Compiling Q[sig]           ( p\Q.hsig, nothing )
  [2 of 2] Compiling P                ( p\P.hs, nothing )
[2 of 3] Processing q
  Instantiating q
  [1 of 1] Compiling Q                ( q\Q.hs, bkpfail12.out\q\Q.o )
[3 of 3] Processing r
  [1 of 3] Compiling H[sig]           ( r\H.hsig, nothing )
  [2 of 3] Instantiating p

bkpfail12.bkp:8:9: error: [GHC-11890]
    • Identifier ‘f’ has conflicting definitions in the module
      and its hsig file.
      Main module: f :: GHC.Types.Bool
        Hsig file: f :: GHC.Types.Int
      The two types are different.
    • While checking that ‘Q’ implements signature ‘Q’ in ‘p[Q=Q]’.