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tcfail097.hs:5:6: error:
• Could not deduce (Eq a0)
from the context: Eq a
bound by the type signature for:
f :: forall a. Eq a => Int -> Int
at tcfail097.hs:5:6-23
The type variable ‘a0’ is ambiguous
• In the ambiguity check for ‘f’
To defer the ambiguity check to use sites, enable AllowAmbiguousTypes
In the type signature: f :: Eq a => Int -> Int
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