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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
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  • #10886

Remove the magic from `Any`

The Any type used to be very highly magical: a poly-kinded type in a mono-kinded world. Then it became only normally magical: a datatype with a return kind of k (instead of *). Then it became only a bit magical: a closed type family with no equations. Now that we have non-magical empty closed type families, I believe that we can remove the last bit of magic and just define

type family Any :: k where { }

somewhere (GHC.Types?), wire it in (like, e.g., Bool), and be done with it.

Objections?

Edited Mar 10, 2019 by Ben Gamari
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