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tcfail098.hs:13:10: error:
• Could not deduce (Bar a0)
from the context: Bar a
bound by an instance declaration:
forall a. Bar a => Bar Bool
at tcfail098.hs:13:10-26
The type variable ‘a0’ is ambiguous
• In the ambiguity check for an instance declaration
To defer the ambiguity check to use sites, enable AllowAmbiguousTypes
In the instance declaration for ‘Bar Bool’
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