rnfail004.hs:6:5:
    Conflicting definitions for ‘a’
    Bound at: rnfail004.hs:6:5
              rnfail004.hs:7:10

rnfail004.hs:7:6:
    Conflicting definitions for ‘b’
    Bound at: rnfail004.hs:7:6
              rnfail004.hs:8:8