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Improve type errors #476

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treeowl opened this issue Dec 28, 2022 · 0 comments
Open

Improve type errors #476

treeowl opened this issue Dec 28, 2022 · 0 comments

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@treeowl
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treeowl commented Dec 28, 2022

Writing the wrong constraint on a polymorphic function (e.g., imposing A_Setter when you really need A_Traversal) tends to give confusing overlapping instance errors. I believe this is because of the way GHC handles functional dependencies. Can those errors be improved by using type family-based constraints instead of fundeps?
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