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[1 of 3] Processing p
[1 of 2] Compiling A[sig] ( p\A.hsig, nothing )
[2 of 2] Compiling M ( p\M.hs, nothing )
[2 of 3] Processing q
Instantiating q
[1 of 1] Compiling A ( q\A.hs, bkpfail46.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, bkpfail46.out\p\p-HVmFlcYSefiK5n1aDP1v7x\A.o )
bkpfail46.bkp:16:9: error: [GHC-15843]
• Type constructor ‘K’ has conflicting definitions in the module
and its hsig file.
Main module: type K :: * -> Constraint
type K a = GHC.Classes.Eq a :: Constraint
Hsig file: type K :: * -> Constraint
class K a
Illegal parameterized type synonym in implementation of abstract data.
• While checking that ‘q:A’ implements signature ‘A’ in ‘p[A=q:A]’.
Suggested fix:
If possible, eta-reduce the type synonym ‘K’ so that it is nullary.
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