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deriving-via-fail.hs:9:34: error:
Type variable ‘b’ is bound in the ‘via’ type ‘(Identity b)’
but is not mentioned in the derived class ‘Show’, which is illegal
deriving-via-fail.hs:12:12: error:
Type variable ‘fooo’ is bound in the ‘via’ type ‘fooo’
but is not mentioned in the derived class ‘Category’, which is illegal
deriving-via-fail.hs:15:20: error:
Type variable ‘a’ is bound in the ‘via’ type ‘(forall a. a)’
but is not mentioned in the derived class ‘Eq’, which is illegal
deriving-via-fail.hs:19:12: error:
Type variable ‘b’ is bound in the ‘via’ type ‘(Identity b)’
but is not mentioned in the derived instance ‘Show (Foo4 a)’, which is illegal
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