(CommandList
  children: [
    (AndOr
      children: [
        (C {(Lit_Other '[')} {($ VSub_Pound '$#')} {(-eq)} {(1)} {(Lit_Other ']')})
        (Assignment
          keyword: Assign_None
          pairs: [
            (assign_pair
              lhs: (LhsName name:re)
              op: Equal
              rhs: {(DQ ($ VSub_Number '$1') ('([^0-9]|') (Lit_Other '$') (')'))}
              spids: [27]
            )
          ]
          spids: [27]
        )
      ]
      op_id: Op_DAmp
    )
    (Pipeline
      children: [
        (C {(echo)} {(DQ ('#include <errno.h>'))})
        (C {(cpp)} {(-dD)} {(-CC)})
        (C {(grep)} {(-E)} {(DQ ('^#define E[^ ]+ ') ($ VSub_Name '$re'))})
        (C {(sed)} {(SQ <':s;s#/\\*\\([^ ]*\\) #/*\\1_#;t s;'>)})
        (C {(column)} {(-t)})
        (C {(tr)} {(_)} {(SQ <' '>)})
        (C {(cut)} 
          {(-c1-) 
            (CommandSubPart
              command_list: (CommandList children:[(C {(tput)} {(cols)})])
              left_token: <Left_CommandSub '$('>
              spids: [95 99]
            )
          }
        )
      ]
      negated: False
    )
  ]
)