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T5236.hs:13:9:
Couldn't match type ‘A’ with ‘B’
arising from a functional dependency between:
constraint ‘Id A B’
arising from the type signature for loop :: Id A B => Bool
instance ‘Id A A’ at T5236.hs:10:10-15
In the ambiguity check for: Id A B => Bool
To defer the ambiguity check to use sites, enable AllowAmbiguousTypes
In the type signature for ‘loop’: loop :: Id A B => Bool
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