mod142.hs:2:21:
    Conflicting exports for `x':
      `module Mod142_A' exports `Mod142_A.x' imported from Mod142_A at mod142.hs:4:1-15
                                               (defined at Mod142_A.hs:3:1)
      `module M' exports `M.x' defined at mod142.hs:6:1