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[1 of 3] Processing p
[1 of 2] Compiling H[sig] ( p\H.hsig, nothing )
[2 of 2] Compiling M ( p\M.hs, nothing )
[2 of 3] Processing h
Instantiating h
[1 of 1] Compiling H ( h\H.hs, bkpfail23.out\h\H.o )
[3 of 3] Processing r
Instantiating r
[1 of 1] Including p[H=h:H]
Instantiating p[H=h:H]
[1 of 2] Compiling H[sig] ( p\H.hsig, bkpfail23.out\p\p-6KeuBvYi0jvLWqVbkSAZMq\H.o )
bkpfail23.bkp:15:9: error: [GHC-15843]
• Type constructor ‘F’ has conflicting definitions in the module
and its hsig file.
Main module: type F :: * -> *
type F a = ()
Hsig file: type role F phantom
type F :: * -> *
data F a
Illegal parameterized type synonym in implementation of abstract data.
• While checking that ‘h:H’ implements signature ‘H’ in ‘p[H=h:H]’.
Suggested fix:
If possible, eta-reduce the type synonym ‘F’ so that it is nullary.
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