overloadedrecfldsfail02.hs:8:18: error: [GHC-87543]
    Ambiguous occurrence ‘x’
    It could refer to
       either the field ‘x’ of record ‘R’,
              defined at overloadedrecfldsfail02.hs:5:16
           or the field ‘x’ of record ‘S’,
              defined at overloadedrecfldsfail02.hs:6:16