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NamedExtraConstraintsWildcard.hs:5:1: error:
• Could not deduce: _0
from the context: (Eq a, _)
bound by the inferred type for ‘foo’:
forall a {_ :: Constraint}. (Eq a, _) => a -> a
at NamedExtraConstraintsWildcard.hs:5:1-15
• In the ambiguity check for the inferred type for ‘foo’
To defer the ambiguity check to use sites, enable AllowAmbiguousTypes
When checking the inferred type
foo :: forall a {_ :: Constraint}. (Eq a, _) => a -> a
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