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tcfail142.hs:18:8:
Could not deduce (Bar a0 r)
arising from the ambiguity check for ‘bar’
from the context (Bar a r)
bound by the type signature for bar :: Bar a r => r -> ()
at tcfail142.hs:18:8-25
The type variable ‘a0’ is ambiguous
In the ambiguity check for: forall r a. Bar a r => r -> ()
To defer the ambiguity check to use sites, enable AllowAmbiguousTypes
In the type signature for ‘bar’: bar :: Bar a r => r -> ()
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