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tcfail080.hs:27:1:
Could not deduce (Collection c0 a)
from the context: Collection c a
bound by the inferred type for ‘q’: Collection c a => a -> Bool
at tcfail080.hs:27:1-27
The type variable ‘c0’ is ambiguous
When checking that ‘q’ has the inferred type
q :: forall (c :: * -> *) a. Collection c a => a -> Bool
Probable cause: the inferred type is ambiguous
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