The GHC manual gives code examples that import GHC.TypeLits. The documentation on that module seems to request that users /not/ import it ...
> This module is an internal GHC module. [...] The programmer interface for working with type-level naturals should be defined in a separate library. ... although I'm not sure what "what be" means here. Does that mean it's a to-do item, and that there will eventually be a separate library, but that we should use this "internal" library directly for now? --- GHC manual: https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/glasgow_exts.html?highlight=typelits#type-level-literals GHC.TypeLits: https://www.stackage.org/haddock/lts-8.5/base-4.9.1.0/GHC-TypeLits.html
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