Hi,
foo _ = undefined
works fine.
Otherwise the poor little a has no chance to get disambiguated.
... Ambiguous type variable `a' in the top-level constraint ...
Ralf
Stefan Holdermans wrote:
Hi,
Just out of curiosity (I cannot come up with a practical example):
Why doesn't the following piece of code type check in GHC (with
extensions)?
foo :: (forall a . (Eq a) = a) - Integer
foo = undefined
It seems like the type-class constraint is playing a decisive rôle
here, since the following does check.
bar :: (forall a . a) - Integer
bar = undefined
TIA,
Stefan
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