ArrForm op _ args)
  = hang (text "(|" <+> ppr_lexpr op)
         4 (sep (map (pprCmdArg.unLoc) args) <+> text "|)")
ppr_expr (H
ppr_expr (HsArrForm op _ args)
  = hang (text "(|" <+> ppr_lexpr op)
         4 (sep (map (pprCmdArg.unLoc) args) <+> text "|)")
ppr_expr (HsArrForm op _ args)
  = hang (text "(|" <+> ppr_lexpr op)
         4 (sep (map (pprCmdArg.unLoc) args) <+> text "|)")