T9872b.hs:19:8: error: [GHC-39999]
    • No instance for ‘Show
                         (Proxy
                            [['Cube G B W R B G, 'Cube W G B W R R, 'Cube R W R B G R,
                              'Cube B R G G W W],
                             ['Cube G B R W B G, 'Cube R R W B G W, 'Cube R G B R W R,
                              'Cube W W G G R B],
                             ['Cube G W R B B G, 'Cube W B W R G R, 'Cube R R B G W R,
                              'Cube B G G W R W],
                             ['Cube G R W B B G, 'Cube R W B G R W, 'Cube R B R W G R,
                              'Cube W G G R W B],
                             ['Cube G R B B W G, 'Cube W W R G B R, 'Cube R B G W R R,
                              'Cube B G W R G W],
                             ['Cube G W B B R G, 'Cube R B G R W W, 'Cube R R W G B R,
                              'Cube W G R W G B],
                             ['Cube G B B W R G, 'Cube W R G B W R, 'Cube R G W R B R,
                              'Cube B W R G G W],
                             ['Cube G B B R W G, 'Cube R G R W B W, 'Cube R W G B R R,
                              'Cube W R W G G B]])’
        arising from a use of ‘print’
    • In the expression: print (Proxy :: Proxy (Solutions Cubes))
      In an equation for ‘main’:
          main = print (Proxy :: Proxy (Solutions Cubes))