(CommandList
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                        {
                          (BracedVarSub
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                            bracket_op: (ArrayIndex expr:(ArithWord w:{(Lit_Digits 0)}))
                            spids: [66 71]
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              terminator: <Op_Semi ';'>
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          action: [
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              pairs: [
                (assign_pair
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                    {
                      (BracedVarSub
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                        bracket_op: (ArrayIndex expr:(ArithWord w:{(Lit_Digits 0)}))
                        suffix_op: (StringUnary op_id:VOp1_Percent arg_word:{(Lit_Slash /) ('*')})
                        spids: [81 89]
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              spids: [80]
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                    (BoolBinary
                      op_id: BoolBinary_GlobDEqual
                      left: {($ VSub_Name '$dirname')}
                      right: {($ VSub_Number '$0')}
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                (Assignment
                  keyword: Assign_None
                  pairs: [
                    (assign_pair
                      lhs: (LhsName name:top_dir)
                      op: Equal
                      rhs: {(SQ <..>)}
                      spids: [104]
                    )
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                  spids: [104]
                )
                (Assignment
                  keyword: Assign_None
                  pairs: [
                    (assign_pair
                      lhs: (LhsName name:top_dir)
                      op: Equal
                      rhs: {(${ VSub_Name dirname) (/..)}
                      spids: [111]
                    )
                  ]
                  spids: [111]
                )
              ]
            )
            (ForEach
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              iter_words: [{(help)} {(alias)}]
              do_arg_iter: F
              body: 
                (DoGroup
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                        (C {(source)} {($ VSub_Name '$top_dir') (/lib/) (${ VSub_Name lib_file) (.sh)})
                      terminator: <Op_Semi ';'>
                    )
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                  spids: [130 142]
                )
              spids: [123 128]
            )
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          spids: [16777215 77]
        )
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      spids: [16777215 144]
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    (C {(_Dbg_help_add)} {(down)} 
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        (SQ <'**down** [*count*]\n'> <'\n'> 
          <'Move the current frame down in the stack trace (to an newer frame). 0 is\n'> <'the most recent frame.\n'> <'\n'> <'If *count* is omitted, use 1.\n'> <'\n'> <'See also:\n'> 
          <'---------\n'> <'\n'> <'**down** and **frame**.'>
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                  flags: [-i]
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                  spids: [184]
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              terminator: <Op_Semi ';'>
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                  left: (LhsName name:start)
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                    (ArithBinary
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                      left: 
                        (ArithBinary
                          op_id: Arith_Plus
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                            (ArithUnary
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                              child: (ArithVarRef name:_Dbg_stack_size)
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                          right: (ArithWord w:{(Lit_Digits 2)})
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                      right: (ArithVarRef name:_Dbg_stack_pos)
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            (Sentence
              child: 
                (Assignment
                  keyword: Assign_Typeset
                  flags: [-i]
                  pairs: [(assign_pair lhs:(LhsName name:end) op:Equal spids:[208])]
                  spids: [204]
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              terminator: <Op_Semi ';'>
            )
            (DParen
              child: 
                (BinaryAssign
                  op_id: Arith_Equal
                  left: (LhsName name:end)
                  right: 
                    (ArithBinary
                      op_id: Arith_Minus
                      left: 
                        (ArithBinary
                          op_id: Arith_Minus
                          left: (ArithVarRef name:_Dbg_stack_size)
                          right: (ArithWord w:{(Lit_Digits 3)})
                        )
                      right: (ArithVarRef name:_Dbg_stack_pos)
                    )
                )
            )
            (C {(_Dbg_complete_num_range)} {($ VSub_Name '$start')} {($ VSub_Name '$end')})
          ]
          spids: [181]
        )
      spids: [177 180]
    )
    (FuncDef
      name: _Dbg_do_down
      body: 
        (BraceGroup
          children: [
            (AndOr
              ops: [Op_DAmp]
              children: [
                (C {(_Dbg_not_running)})
                (ControlFlow token:<ControlFlow_Return return> arg_word:{(3)})
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            )
            (Assignment
              keyword: Assign_Typeset
              pairs: [
                (assign_pair
                  lhs: (LhsName name:count)
                  op: Equal
                  rhs: 
                    {
                      (BracedVarSub
                        token: <VSub_Number 1>
                        suffix_op: (StringUnary op_id:VTest_ColonHyphen arg_word:{(1)})
                        spids: [251 255]
                      )
                    }
                  spids: [250]
                )
              ]
              spids: [248]
            )
            (C {(_Dbg_is_signed_int)} {($ VSub_Name '$count')})
            (If
              arms: [
                (if_arm
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                    (Sentence
                      child: 
                        (DParen
                          child: 
                            (ArithBinary
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                              left: (ArithWord w:{(Lit_Digits 0)})
                              right: (ArithWord w:{($ VSub_QMark '$?')})
                            )
                        )
                      terminator: <Op_Semi ';'>
                    )
                  ]
                  action: [
                    (C {(_Dbg_frame_adjust)} {($ VSub_Name '$count')} {(-1)})
                    (Assignment
                      keyword: Assign_Typeset
                      flags: [-i]
                      pairs: [
                        (assign_pair
                          lhs: (LhsName name:rc)
                          op: Equal
                          rhs: {($ VSub_QMark '$?')}
                          spids: [292]
                        )
                      ]
                      spids: [288]
                    )
                  ]
                  spids: [16777215 278]
                )
              ]
              else_action: [
                (C {(_Dbg_errmsg)} {(DQ ('Expecting an integer; got ') ($ VSub_Name '$count'))})
                (Assignment
                  keyword: Assign_Typeset
                  flags: [-i]
                  pairs: [(assign_pair lhs:(LhsName name:rc) op:Equal rhs:{(2)} spids:[311])]
                  spids: [307]
                )
              ]
              spids: [296 315]
            )
            (AndOr
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              children: [
                (DParen
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                    (ArithBinary
                      op_id: Arith_DEqual
                      left: (ArithWord w:{(Lit_Digits 0)})
                      right: (ArithVarRef name:rc)
                    )
                )
                (Assignment
                  keyword: Assign_None
                  pairs: [
                    (assign_pair
                      lhs: (LhsName name:_Dbg_last_cmd)
                      op: Equal
                      rhs: {(SQ <down>)}
                      spids: [329]
                    )
                  ]
                  spids: [329]
                )
              ]
            )
            (ControlFlow token:<ControlFlow_Return return> arg_word:{($ VSub_Name '$rc')})
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          spids: [236]
        )
      spids: [232 235]
    )
    (If
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        (if_arm
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            (Sentence
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                (DBracket
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                    (BoolBinary
                      op_id: BoolBinary_GlobDEqual
                      left: {($ VSub_Number '$0')}
                      right: 
                        {
                          (BracedVarSub
                            token: <VSub_Name BASH_SOURCE>
                            bracket_op: (ArrayIndex expr:(ArithWord w:{(Lit_Digits 0)}))
                            spids: [353 358]
                          )
                        }
                    )
                )
              terminator: <Op_Semi ';'>
            )
          ]
          action: [
            (ForEach
              iter_name: _Dbg_file
              iter_words: [{(help)} {(msg)} {(sort)} {(columnize)}]
              do_arg_iter: F
              body: 
                (DoGroup
                  children: [
                    (C {(source)} {(${ VSub_Name top_dir) (/lib/) (${ VSub_Name _Dbg_file) (.sh)})
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                  spids: [383 398]
                )
              spids: [372 381]
            )
            (C {(source)} {(${ VSub_Name top_dir) (/command/help.sh)})
            (Assignment
              keyword: Assign_None
              pairs: [
                (assign_pair
                  lhs: (LhsName name:_Dbg_args)
                  op: Equal
                  rhs: {(SQ <down>)}
                  spids: [409]
                )
              ]
              spids: [409]
            )
            (C {(_Dbg_do_help)} {(down)})
          ]
          spids: [16777215 364]
        )
      ]
      spids: [16777215 419]
    )
  ]
)