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[1 of 3] Processing p
  [1 of 2] Compiling A[sig]           ( p\A.hsig, nothing )
  [2 of 2] Compiling B                ( p\B.hs, nothing )
[2 of 3] Processing q
  Instantiating q
  [1 of 1] Compiling A                ( q\A.hs, bkpfail43.out\q\A.o )
[3 of 3] Processing r
  Instantiating r
  [1 of 1] Including p[A=q:A]
    Instantiating p[A=q:A]
    [1 of 2] Compiling A[sig]           ( p\A.hsig, bkpfail43.out\p\p-HVmFlcYSefiK5n1aDP1v7x\A.o )

bkpfail43.out\p\p-HVmFlcYSefiK5n1aDP1v7x\..\A.hi:1:1: error: [GHC-39999]
    • No instance for ‘GHC.Show.Show (a -> b)’
        arising when attempting to show that
        instance [safe] GHC.Show.Show (a -> b)
          -- Defined at bkpfail43.bkp:3:18
        is provided by ‘q:A’
        (maybe you haven't applied a function to enough arguments?)
    • while checking that q:A implements signature A in p[A=q:A]