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T8034.hs:6:3: error:
• Couldn't match type: F a0
with: F a
Expected: F a -> F a
Actual: F a0 -> F a0
NB: ‘F’ is a non-injective type family
The type variable ‘a0’ is ambiguous
• In the ambiguity check for ‘foo’
To defer the ambiguity check to use sites, enable AllowAmbiguousTypes
When checking the class method: foo :: forall a. C a => F a -> F a
In the class declaration for ‘C’
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