ppr_mono_ty _    (HsPArrTy ty)       = paBrackets (ppr_mono_lty TopPrec ty)
ppr_mono_ty _    (HsPArrTy ty)       = paBrackets (ppr_mono_lty TopPrec ty)
ppr_mono_ty _    (HsPArrTy ty)       = paBrackets (ppr_mono_lty TopPrec ty)