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tcfail116.hs:6:5: error:
Could not deduce (Foo a0)
from the context: Foo a
bound by the type signature for:
bug :: Foo a => ()
at tcfail116.hs:6:5-13
The type variable ‘a0’ is ambiguous
In the ambiguity check for ‘bug’
To defer the ambiguity check to use sites, enable AllowAmbiguousTypes
When checking the class method: bug :: forall a. Foo a => ()
In the class declaration for ‘Foo’
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