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This breaks up the monstrous TyCoReps module into several new modules by topic: * TyCoRep: Contains the `Coercion`, `Type`, and related type definitions and a few simple predicates but nothing further * TyCoPpr: Contains the the pretty-printer logic * TyCoFVs: Contains the free variable computations (and `tyConAppNeedsKindSig`, although I suspect this should change) * TyCoSubst: Contains the substitution logic for types and coercions * TyCoTidy: Contains the tidying logic for types While we are able to eliminate a good number of `SOURCE` imports (and make a few others smaller) with this change, we must introduce one new `hs-boot` file for `TyCoPpr` so that `TyCoRep` can define `Outputable` instances for the types it defines. Metric Increase: haddock.Cabal haddock.compiler
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