(CommandList
  children: [
    (C {(_Dbg_help_add_sub)} {(show)} {(basename)} 
      {
        (SQ <"show basename\n"> <"\n"> <"Show whether use short filenames\n"> <"\n"> 
          <"See also \\\"set basename\\\".">
        )
      } {(1)}
    )
    (FuncDef
      name: _Dbg_do_show_basename
      body: 
        (BraceGroup
          children: [
            (AndOr
              children: [
                (DBracket
                  expr: (BoolUnary op_id:BoolUnary_n child:{($ VSub_Number "$1")})
                )
                (Assignment
                  keyword: Assign_None
                  pairs: [
                    (assign_pair
                      lhs: (LhsName name:label)
                      op: Equal
                      rhs: 
                        {
                          (CommandSubPart
                            command_list: 
                              (CommandList
                                children: [(C {(_Dbg_printf_nocr)} {(DQ ("%-12s: "))} {(basename)})]
                              )
                            left_token: <Left_CommandSub "$(">
                            spids: [94 102]
                          )
                        }
                      spids: [93]
                    )
                  ]
                  spids: [93]
                )
              ]
              op_id: Op_DAmp
            )
            (C {(_Dbg_msg)} 
              {(DQ (${ VSub_Name label) ("Show short filenames (the basename) in debug output is"))} 
              {
                (CommandSubPart
                  command_list: 
                    (CommandList
                      children: [(C {(_Dbg_onoff)} {($ VSub_Name "$_Dbg_set_basename")})]
                    )
                  left_token: <Left_CommandSub "$(">
                  spids: [116 120]
                )
              }
            )
            (C {(typeset)} {(Lit_VarLike "onoff=") (DQ (on.))})
            (AndOr
              children: [
                (DBracket
                  expr: 
                    (BoolUnary
                      op_id: BoolUnary_z
                      child: 
                        {
                          (BracedVarSub
                            token: <VSub_Name _Dbg_cmdloop_hooks>
                            bracket_op: (ArrayIndex expr:(ArithWord w:{(DQ (list))}))
                            spids: [135 142]
                          )
                        }
                    )
                )
                (Assignment
                  keyword: Assign_None
                  pairs: [
                    (assign_pair
                      lhs: (LhsName name:onoff)
                      op: Equal
                      rhs: {(SQ <off.>)}
                      spids: [148]
                    )
                  ]
                  spids: [148]
                )
              ]
              op_id: Op_DAmp
            )
            (ControlFlow token:<ControlFlow_Return return> arg_word:{(0)})
          ]
          spids: [80]
        )
      spids: [76 79]
    )
  ]
)