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T1897b.hs:16:1:
Could not deduce (Depend a ~ Depend a0)
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
Expected type: [Depend a] -> Bool
Actual type: [Depend a0] -> Bool
When checking that `isValid'
has the inferred type `forall a1. Bug a1 => [Depend a1] -> Bool'
Probable cause: the inferred type is ambiguous
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