Allow functor derivation under quantification#3295
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When "functor variables" exist within a quantifier, they don't seem to derive properly: ``` data T a = T (forall x. a) ``` This commit (hopefully!) fixes this, allowing the compiler to drill down through these skolem scopes.
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Have spoken to @LiamGoodacre, there are a couple more things to do before this is ready for review 😳 |
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Also now does constraints! |
- One can now derive functors for types that involve constraints. - Shadowed variables are now properly handled in functor deriving. tl;dr: this works now! ``` data T a = T (forall x. Show x => a) (forall a. a) ```
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When "functor variables" exist within a quantifier, they don't seem to
derive properly:
This commit (hopefully!) fixes this, allowing the compiler to drill down
through these skolem scopes. This fixes #3232.