tcfail036.hs:6:10:
    Duplicate instance declarations:
      instance Num NUM -- Defined at tcfail036.hs:6:10-16
      instance Num NUM -- Defined at tcfail036.hs:8:10-16

tcfail036.hs:9:13:
    Class `Num' used as a type
    In the instance declaration for `Eq Num'