rn063.hs:10:9: warning: [GHC-40910] [-Wunused-local-binds (in -Wextra, -Wunused-binds)]
    Defined but not used: ‘x’

rn063.hs:13:9: warning: [GHC-40910] [-Wunused-local-binds (in -Wextra, -Wunused-binds)]
    Defined but not used: ‘y’