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T5236.hs:13:9: error:
Couldn't match type ‘B’ with ‘A’
arising from a functional dependency between:
constraint ‘Id A B’
arising from the type signature for:
loop :: Id A B => Bool
instance ‘Id B B’ at T5236.hs:11:10-15
Inaccessible code in
the type signature for:
loop :: Id A B => Bool
In the ambiguity check for ‘loop’
To defer the ambiguity check to use sites, enable AllowAmbiguousTypes
In the type signature: loop :: Id A B => Bool
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