app/Main.hs:61:17: error:
    • Couldn't match expected type ‘t0 (Int, Int)’
                  with actual type ‘Aliens’
    • In the first argument of ‘forM_’, namely ‘aliens’
      In the first argument of ‘liftIO’, namely
        ‘(forM_
            aliens
            \ (row, col)
              -> do setCursorPosition row col
                    putChar '@')’
      In a stmt of a 'do' block:
        liftIO
          (forM_
             aliens
             \ (row, col)
               -> do setCursorPosition row col
                     putChar '@')
   |
61 |   liftIO (forM_ aliens \(row, col) -> do
   |                 ^^^^^^