Why is Data.Comp.Ops.(:+:) redefined rather than reusing the one from GHC.Generics?

[yairchu]

It appears that the :+: type operator in Data.Comp.Ops can be replaced with using the one from GHC.Generics (which appears to be a poly-kinded version of the same thing).

Did you consider using the one from base?
It seems like it would make it useful to automatically create inject/preview/prisms for normal ADTs using Generic (perhaps someone already made something like that?)

[yairchu]

I experimented with implementing this generic subtype injector here