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drvfail011.hs:8:1:
    No instance for (Eq a)
      arising from a use of `=='
    In the expression: ((a1 == b1))
    In an equation for `==': == (T1 a1) (T1 b1) = ((a1 == b1))
    When typechecking the code for  `=='
      in a standalone derived instance for `Eq (T a)':
      To see the code I am typechecking, use -ddump-deriv
    In the instance declaration for `Eq (T a)'