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T15073.hs:8:12: error:
• Illegal unboxed tuple type as function argument: (# Foo a #)
Perhaps you intended to use UnboxedTuples
• In the type signature:
p :: Foo a -> Solo# @'GHC.Types.LiftedRep (Foo a)
When typechecking the code for ‘p’
in a derived instance for ‘P (Foo a)’:
To see the code I am typechecking, use -ddump-deriv
In the instance declaration for ‘P (Foo a)’
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