T14907b.hs:5:1: error: [GHC-58805]
    Illegal binding of an existing name: ()

T14907b.hs:6:1: error: [GHC-58805]
    Illegal binding of an existing name: (,)

T14907b.hs:7:1: error: [GHC-58805]
    Illegal binding of an existing name: (,,)