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