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T1897b.hs:16:1:
Could not deduce (Depend a0 ~ Depend a)
from the context (Bug a)
bound by the inferred type for ‘isValid’:
Bug a => [Depend a] -> Bool
at T1897b.hs:16:1-41
NB: ‘Depend’ is a type function, and may not be injective
The type variable ‘a0’ is ambiguous
Expected type: [Depend a] -> Bool
Actual type: [Depend a0] -> Bool
When checking that ‘isValid’
has the inferred type ‘forall a. Bug a => [Depend a] -> Bool’
Probable cause: the inferred type is ambiguous
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