(AndOr
  ops: [Op_DAmp]
  children: [
    (FuncDef
      name: _bk
      body: 
        (BraceGroup
          children: [
            (Assignment
              keyword: Assign_Local
              pairs: [
                (assign_pair lhs:(LhsName name:cur) op:Equal spids:[16])
                (assign_pair lhs:(LhsName name:prev) op:Equal spids:[18])
                (assign_pair lhs:(LhsName name:words) op:Equal spids:[20])
                (assign_pair lhs:(LhsName name:cword) op:Equal spids:[22])
              ]
              spids: [14]
            )
            (AndOr
              ops: [Op_DPipe]
              children: [(C {(_init_completion)}) (ControlFlow token:<ControlFlow_Return return>)]
            )
            (Assignment
              keyword: Assign_Local
              pairs: [
                (assign_pair
                  lhs: (LhsName name:BKCMDS)
                  op: Equal
                  rhs: 
                    {
                      (DQ 
                        (CommandSubPart
                          command_list: 
                            (CommandList
                              children: [
                                (Pipeline
                                  children: [
                                    (SimpleCommand
                                      words: [{(bk)} {(help)} {(topics)}]
                                      redirects: [
                                        (Redir
                                          op: <Redir_Great '2>'>
                                          fd: 2
                                          arg_word: {(/dev/null)}
                                        )
                                      ]
                                    )
                                    (C {(awk)} {(SQ <'/^  bk/ { print $4 }'>)})
                                    (C {(xargs)} {(printf)} {(SQ <'%s '>)})
                                  ]
                                  negated: F
                                )
                              ]
                            )
                          left_token: <Left_CommandSub '$('>
                          spids: [37 68]
                        )
                      )
                    }
                  spids: [35]
                )
              ]
              spids: [33]
            )
            (Assignment
              keyword: Assign_None
              pairs: [
                (assign_pair
                  lhs: (LhsName name:COMPREPLY)
                  op: Equal
                  rhs: 
                    {
                      (ArrayLiteralPart
                        words: [
                          {
                            (CommandSubPart
                              command_list: 
                                (CommandList
                                  children: [
                                    (C {(compgen)} {(-W)} {(DQ ($ VSub_Name '$BKCMDS'))} {(--)} 
                                      {(DQ ($ VSub_Name '$cur'))}
                                    )
                                  ]
                                )
                              left_token: <Left_CommandSub '$('>
                              spids: [76 92]
                            )
                          }
                        ]
                      )
                    }
                  spids: [73]
                )
              ]
              spids: [73]
            )
            (C {(_filedir)})
            (ControlFlow token:<ControlFlow_Return return> arg_word:{(0)})
          ]
          spids: [11]
        )
      spids: [7 10]
    )
    (C {(complete)} {(-F)} {(_bk)} {(bk)})
  ]
)