Erro Xmonad com o OnlyFloat

Question

Eu escrevo xmonad.hs ano atrás, mas agora ele falhou com o erro: Data constructor not in scope: OnlyFloat . Como posso consertar isso?

Parte de xmonad.hs :

myLayoutHook = gaps [(U,6),(L,6),(R,6)] (spacing 4 (lessBorders OnlyFloat (tiled))) ||| noBorders (fullscreenFull Full)
    where
    tiled   = Tall nmaster delta ratio
    nmaster = 1
    ratio   = 1/2
    delta   = 3/100

Erro:

xmonad.hs:36:65: error: Data constructor not in scope: OnlyFloat
   |
36 | myLayoutHook = gaps [(U,6),(L,6),(R,6)] (spacing 4 (lessBorders OnlyFloat (tiled))) ||| noBorders (fullscreenFull Full)
   |