mod155.hs:2:10: error: [GHC-69158]
    Conflicting exports for ‘id’:
       ‘module M’ exports ‘M.id’
         imported from ‘Prelude’ at mod155.hs:4:1-19
         (and originally defined in ‘GHC.Base’)
       ‘module M’ exports ‘M.id’ defined at mod155.hs:5:1