Better errors for missing HasDatatypeInfo
#8
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I was completely baffled by the type error when trying to apply
RecordTypeOfto a type with no instance ofHasDatatypeOf.I fixed it based on https://blog.csongor.co.uk/report-stuck-families/ and
https://hackage.haskell.org/package/type-errors-0.2.0.0.
Maybe this should be fixed in
Generics.SOPnearerHasDatatypeInfo?