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tcfail098.hs:12:10:
Could not deduce (Bar a0)
arising from the ambiguity check for an instance declaration
from the context (Bar a)
bound by an instance declaration: Bar a => Bar Bool
at tcfail098.hs:12:10-26
The type variable ‘a0’ is ambiguous
In the ambiguity check for: forall a. Bar a => Bar Bool
To defer the ambiguity check to use sites, enable AllowAmbiguousTypes
In the instance declaration for ‘Bar Bool’
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