(command.AndOr
  ops: [Id.Op_DAmp]
  children: [
    (command.ShFunction
      name: _bk
      body: 
        (command.BraceGroup
          children: [
            (C {<local>} {<cur>} {<prev>} {<words>} {<cword>})
            (command.AndOr
              ops: [Id.Op_DPipe]
              children: [
                (C {<_init_completion>})
                (command.ControlFlow token:<Id.ControlFlow_Return return>)
              ]
            )
            (C {<local>} 
              {<Id.Lit_VarLike 'BKCMDS='> 
                (DQ 
                  (command_sub
                    left_token: <Id.Left_DollarParen '$('>
                    command_list: 
                      (command.CommandList
                        children: [
                          (command.Pipeline
                            children: [
                              (command.Simple
                                words: [{<bk>} {<help>} {<topics>}]
                                redirects: [
                                  (redir.Redir
                                    op: <Id.Redir_Great '2>'>
                                    fd: 2
                                    arg_word: {</dev/null>}
                                  )
                                ]
                              )
                              (C {<awk>} {(SQ <'/^  bk/ { print $4 }'>)})
                              (C {<xargs>} {<printf>} {(SQ <'%s '>)})
                            ]
                            negated: F
                          )
                        ]
                      )
                  )
                )
              }
            )
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:COMPREPLY)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (sh_array_literal
                        left: <Id.Op_LParen _>
                        words: [
                          {
                            (command_sub
                              left_token: <Id.Left_DollarParen '$('>
                              command_list: 
                                (command.CommandList
                                  children: [
                                    (C {<compgen>} {<-W>} {(DQ ($ Id.VSub_DollarName '$BKCMDS'))} {<-->} 
                                      {(DQ ($ Id.VSub_DollarName '$cur'))}
                                    )
                                  ]
                                )
                            )
                          }
                        ]
                      )
                    }
                  spids: [73]
                )
              ]
            )
            (C {<_filedir>})
            (command.ControlFlow token:<Id.ControlFlow_Return return> arg_word:{<0>})
          ]
        )
    )
    (C {<complete>} {<-F>} {<_bk>} {<bk>})
  ]
)