(CommandList
  children: [
    (AndOr
      children: [
        (C {(_userland)} {(GNU)})
        (ControlFlow token:<ControlFlow_Return return> arg_word:{(1)})
      ]
      op_id: Op_DPipe
    )
    (AndOr
      children: [
        (FuncDef
          name: _ifupdown
          body: 
            (BraceGroup
              children: [
                (Assignment
                  keyword: Assign_Local
                  pairs: [
                    (assign_pair lhs:(LhsName name:cur) op:Equal spids:[24])
                    (assign_pair lhs:(LhsName name:prev) op:Equal spids:[26])
                    (assign_pair lhs:(LhsName name:words) op:Equal spids:[28])
                    (assign_pair lhs:(LhsName name:cword) op:Equal spids:[30])
                  ]
                  spids: [22]
                )
                (AndOr
                  children: [(C {(_init_completion)}) (ControlFlow token:<ControlFlow_Return return>)]
                  op_id: Op_DPipe
                )
                (If
                  arms: [
                    (if_arm
                      cond: [
                        (Sentence
                          child: 
                            (DBracket
                              expr: 
                                (BoolBinary
                                  op_id: BoolBinary_eq
                                  left: {($ VSub_Name "$cword")}
                                  right: {(1)}
                                )
                            )
                          terminator: <Op_Semi ";">
                        )
                      ]
                      action: [
                        (C {(_configured_interfaces)})
                        (Assignment
                          keyword: Assign_None
                          pairs: [
                            (assign_pair
                              lhs: (LhsName name:COMPREPLY)
                              op: Equal
                              rhs: 
                                {
                                  (ArrayLiteralPart
                                    words: [
                                      {
                                        (CommandSubPart
                                          command_list: 
                                            (CommandList
                                              children: [
                                                (C {(compgen)} {(-W)} {(SQ <"${COMPREPLY[@]}">)} {(--)} 
                                                  {(DQ ($ VSub_Name "$cur"))}
                                                )
                                              ]
                                            )
                                          left_token: <Left_CommandSub "$(">
                                          spids: [63 77]
                                        )
                                      }
                                    ]
                                  )
                                }
                              spids: [60]
                            )
                          ]
                          spids: [60]
                        )
                      ]
                      spids: [-1 54]
                    )
                  ]
                  spids: [-1 82]
                )
                (ControlFlow token:<ControlFlow_Return return> arg_word:{(0)})
              ]
              spids: [19]
            )
          spids: [15 18]
        )
        (C {(complete)} {(-F)} {(_ifupdown)} {(ifup)} {(ifdown)} {(ifstatus)})
      ]
      op_id: Op_DAmp
    )
  ]
)