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> x -> a x y -> z y
> ...tells me nothing.
I am guessing that you wouldn’t see a type signature like this in a real codebase. The type signature of Data.HashMap.Strict.lookup is
(Eq k, Hashable k) => k -> HashMap k v -> Maybe v
https://hoogle.haskell.org/?hoogle=x%20-%3E%20HashMap%20x%20...
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> x -> a x y -> z y
> ...tells me nothing.
I am guessing that you wouldn’t see a type signature like this in a real codebase. The type signature of Data.HashMap.Strict.lookup is
which is quite a bit more readable. You can even search Hoogle for x -> HashMap x y -> y and find it, try it!https://hoogle.haskell.org/?hoogle=x%20-%3E%20HashMap%20x%20...