(CommandList
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        (if_arm
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                    (BoolBinary
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                      right: 
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                          (BracedVarSub
                            token: <VSub_Name BASH_SOURCE>
                            bracket_op: (ArrayIndex expr:(ArithWord w:{(Lit_Digits 0)}))
                            spids: [69 74]
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              terminator: <Op_Semi ";">
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          action: [
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              keyword: Assign_None
              pairs: [
                (assign_pair
                  lhs: (LhsName name:dirname)
                  op: Equal
                  rhs: 
                    {
                      (BracedVarSub
                        token: <VSub_Name BASH_SOURCE>
                        bracket_op: (ArrayIndex expr:(ArithWord w:{(Lit_Digits 0)}))
                        suffix_op: (StringUnary op_id:VOp1_Percent arg_word:{(Lit_Slash /) ("*")})
                        spids: [84 92]
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                    }
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              spids: [83]
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                      right: {($ VSub_Number "$0")}
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                (AndOr
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                    (Assignment
                      keyword: Assign_None
                      pairs: [
                        (assign_pair
                          lhs: (LhsName name:top_dir)
                          op: Equal
                          rhs: {(SQ <../..>)}
                          spids: [107]
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                      spids: [107]
                    )
                    (Assignment
                      keyword: Assign_None
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                        (assign_pair
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                          op: Equal
                          rhs: {(${ VSub_Name dirname) (/../..)}
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                  op_id: Op_DPipe
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              op_id: Op_DAmp
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            (AndOr
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                (DBracket
                  expr: (BoolUnary op_id:BoolUnary_z child:{($ VSub_Name "$_Dbg_libdir")})
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                (Assignment
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                    (assign_pair
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                      op: Equal
                      rhs: {($ VSub_Name "$top_dir")}
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              op_id: Op_DAmp
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              iter_words: [{(help)} {(alias)}]
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              body: 
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                      terminator: <Op_Semi ";">
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          spids: [-1 80]
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      spids: [-1 161]
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    (C {(_Dbg_help_add_sub)} {(set)} {(width)} 
      {(SQ <"**set** **width** *width*\n"> <"\n"> <"Set maximum width of lines to *width*.\n">)} {(1)}
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    (Sentence child:(C {(typeset)} {(-i)} {(_Dbg_set_linewidth)}) terminator:<Op_Semi ";">)
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      pairs: [
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          rhs: 
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              (BracedVarSub
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                suffix_op: (StringUnary op_id:VTest_ColonHyphen arg_word:{(80)})
                spids: [188 192]
              )
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          spids: [187]
        )
      ]
      spids: [187]
    )
    (FuncDef
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                (if_arm
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                    (Sentence
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                        (DBracket
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                            (BoolBinary
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                              left: {($ VSub_Number "$1")}
                              right: {($ VSub_Name "$int_pat")}
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                        )
                      terminator: <Op_Semi ";">
                    )
                  ]
                  action: [
                    (C {(_Dbg_write_journal_eval)} {(DQ ("_Dbg_set_linewidth=") ($ VSub_Number "$1"))})
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                  spids: [-1 216]
                )
              ]
              else_action: [
                (C {(_Dbg_errmsg)} {(DQ ("Integer argument expected; got: ") ($ VSub_Number "$1"))})
                (ControlFlow token:<ControlFlow_Return return> arg_word:{(1)})
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              spids: [227 243]
            )
            (ControlFlow token:<ControlFlow_Return return> arg_word:{(0)})
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          spids: [199]
        )
      spids: [195 198]
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)