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NamedWildcardsNotInMonotype.hs:5:1: error:
• Could not deduce (Eq w0)
from the context: (Show a, Eq w, Eq a)
bound by the inferred type for ‘foo’:
(Show a, Eq w, Eq a) => a -> a -> String
at NamedWildcardsNotInMonotype.hs:5:1-33
The type variable ‘w0’ is ambiguous
• 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 w a. (Show a, Eq w, Eq a) => a -> a -> String
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