rnfail040.hs:7:12:
    Conflicting exports for ‛nub’:
       ‛module M’ exports ‛M.nub’
         imported from ‛Data.List’ at rnfail040.hs:10:2-22
       ‛module M’ exports ‛T.nub’
         imported from ‛Rnfail040_A’ at rnfail040.hs:11:2-24
         (and originally defined at Rnfail040_A.hs:2:3-5)