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T1897a.hs:9:1:
Could not deduce (Wob a0 b)
arising from the ambiguity check for ‛foo’
from the context (Wob a b)
bound by the inferred type for ‛foo’: Wob a b => b -> [b]
at T1897a.hs:9:1-24
The type variable ‛a0’ is ambiguous
When checking that ‛foo’
has the inferred type ‛forall a b. Wob a b => b -> [b]’
Probable cause: the inferred type is ambiguous
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