On Mon, 25 Jul 2022, Richard Eisenberg wrote:
I see this substitution as happening before any type-checking, so zonking
shouldn't be an issue. That is, I would expect a
substHsTy :: UniqFM Name (HsType GhcRn) -> HsType GhcRn -> HsType GhcRn
to do the work, entirely before type-checking.
If I were to do this fully during renaming, how do I even find out that a
`Name` refers to a type macro? During typechecking I can look up the `TyThing`,
see if it's a `MacroTyCon`, and get the rhs from that. But I don't think we
store
anything about already-renamed declarations during renaming the same way
we store info about already-typechecked things during typechecking in
`tcg_type_env`.
It sounds awfully special-case to store these type macros in a new field
of `TcGblEnv` instead of as just another kind of `TyCon`.
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