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        (if_arm
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            (command.Sentence
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                (command.DBracket
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                    (bool_expr.Unary
                      op_id: Id.BoolUnary_z
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                        {
                          (DQ 
                            (braced_var_sub
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                              bracket_op: 
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                                  expr: (arith_expr.ArithWord w:{<Id.Lit_Digits 0>})
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                    )
                )
              terminator: <Id.Op_Semi _>
            )
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          action: [
            (command.Simple
              words: [{<echo>} {(DQ <'Sorry, you need to use a debugger-enabled version of bash.'>)}]
              redirects: [(redir.Redir op:<Id.Redir_GreatAnd '2>&'> fd:2 arg_word:{<1>})]
            )
            (command.ControlFlow token:<Id.ControlFlow_Exit exit> arg_word:{<2>})
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          spids: [62 81]
        )
      ]
    )
    (command.ForEach
      iter_name: _Dbg_file
      iter_words: [{<require>} {<pre>} {<vars>} {<io>}]
      do_arg_iter: F
      body: 
        (command.DoGroup
          children: [
            (C {<source>} {(${ Id.VSub_Name _Dbg_libdir) </init/> (${ Id.VSub_Name _Dbg_file) <.sh>})
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        )
    )
    (command.ForEach
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      iter_words: [
        {(${ Id.VSub_Name _Dbg_libdir) </lib/> <Id.Lit_Star '*'> <.sh>}
        {(${ Id.VSub_Name _Dbg_libdir) </command/> <Id.Lit_Star '*'> <.sh>}
      ]
      do_arg_iter: F
      body: (command.DoGroup children:[(C {<source>} {($ Id.VSub_DollarName '$_Dbg_file')})])
    )
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: (command.DBracket expr:(bool_expr.Unary op_id:Id.BoolUnary_r child:{</dev/stdin>}))
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [(C {<_Dbg_do_source>} {</dev/stdin>})]
          spids: [175 187]
        )
        (if_arm
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            (command.Sentence
              child: 
                (command.DBracket
                  expr: 
                    (bool_expr.Binary
                      op_id: Id.BoolBinary_GlobNEqual
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                        {
                          (command_sub
                            left_token: <Id.Left_DollarParen '$('>
                            command_list: (command.CommandList children:[(C {<tty>})])
                          )
                        }
                      right: {(SQ <'not a tty'>)}
                    )
                )
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [
            (C {<_Dbg_do_source>} 
              {
                (command_sub
                  left_token: <Id.Left_DollarParen '$('>
                  command_list: (command.CommandList children:[(C {<tty>})])
                )
              }
            )
          ]
          spids: [194 212]
        )
      ]
    )
    (C {<typeset>} {<-a>} {<_Dbg_input>})
    (command.If
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        (if_arm
          cond: [
            (command.Sentence
              child: 
                (command.DBracket
                  expr: 
                    (bool_expr.Unary
                      op_id: Id.BoolUnary_n
                      child: {(DQ ($ Id.VSub_DollarName '$DBG_INPUT'))}
                    )
                )
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [
            (command.ShAssignment
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                (assign_pair
                  lhs: (sh_lhs_expr.Name name:_Dbg_input)
                  op: assign_op.Equal
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                    {
                      (sh_array_literal
                        left: <Id.Op_LParen _>
                        words: [{(DQ ($ Id.VSub_DollarName '$DBG_INPUT'))}]
                      )
                    }
                  spids: [264]
                )
              ]
            )
            (C {<_Dbg_do_source>} 
              {
                (DQ 
                  (braced_var_sub
                    token: <Id.VSub_Name _Dbg_input>
                    bracket_op: 
                      (bracket_op.ArrayIndex
                        expr: (arith_expr.ArithWord w:{<Id.Lit_Digits 0>})
                      )
                  )
                )
              }
            )
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:_Dbg_no_nx)
                  op: assign_op.Equal
                  rhs: {<1>}
                  spids: [284]
                )
              ]
            )
          ]
          spids: [246 260]
        )
      ]
    )
    (C {<typeset>} 
      {<Id.Lit_VarLike '_Dbg_startup_cmdfile='> 
        (braced_var_sub
          token: <Id.VSub_Name HOME>
          suffix_op: (suffix_op.Unary op_id:Id.VTest_ColonHyphen arg_word:{<'~'>})
        ) </.> (${ Id.VSub_Name _Dbg_debugger_name) <rc>
      }
    )
    (command.If
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        (if_arm
          cond: [
            (command.Sentence
              child: 
                (command.AndOr
                  ops: [Id.Op_DAmp]
                  children: [
                    (command.DParen
                      child: 
                        (arith_expr.Binary
                          op_id: Id.Arith_DEqual
                          left: (arith_expr.ArithWord w:{<Id.Lit_Digits 0>})
                          right: (arith_expr.VarRef token:<Id.Lit_ArithVarLike _Dbg_o_nx>)
                        )
                    )
                    (command.DBracket
                      expr: 
                        (bool_expr.Unary
                          op_id: Id.BoolUnary_r
                          child: {(DQ ($ Id.VSub_DollarName '$_Dbg_startup_cmdfile'))}
                        )
                    )
                  ]
                )
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [(C {<_Dbg_do_source>} {(DQ ($ Id.VSub_DollarName '$_Dbg_startup_cmdfile'))})]
          spids: [304 330]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: 
                (command.DBracket
                  expr: 
                    (bool_expr.Unary
                      op_id: Id.BoolUnary_z
                      child: {(DQ (${ Id.VSub_Name _Dbg_DEBUGGER_LEVEL))}
                    )
                )
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [(C {<typeset>} {<-xi>} {<Id.Lit_VarLike '_Dbg_DEBUGGER_LEVEL='> <1>})]
          spids: [348 364]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: [
            (command.Sentence
              child: 
                (command.DBracket
                  expr: 
                    (bool_expr.Binary
                      op_id: Id.BoolBinary_GlobDEqual
                      left: 
                        {
                          (braced_var_sub
                            token: <Id.VSub_Name _Dbg_libdir>
                            suffix_op: 
                              (suffix_op.Slice
                                begin: (arith_expr.ArithWord w:{<Id.Lit_Digits 0>})
                                length: (arith_expr.ArithWord w:{<Id.Lit_Digits 1>})
                              )
                          )
                        }
                      right: {(SQ <.>)}
                    )
                )
              terminator: <Id.Op_Semi _>
            )
          ]
          action: [
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:_Dbg_libdir)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (command_sub
                        left_token: <Id.Left_DollarParen '$('>
                        command_list: 
                          (command.CommandList
                            children: [
                              (C {<_Dbg_expand_filename>} 
                                {(${ Id.VSub_Name _Dbg_init_cwd) </> (${ Id.VSub_Name _Dbg_libdir)}
                              )
                            ]
                          )
                      )
                    }
                  spids: [416]
                )
              ]
            )
          ]
          spids: [387 409]
        )
      ]
    )
    (command.ForEach
      iter_name: source_file
      iter_words: [
        {
          (braced_var_sub
            token: <Id.VSub_Name _Dbg_o_init_files>
            bracket_op: (bracket_op.WholeArray op_id:Id.Lit_At)
          )
        }
        {(DQ ($ Id.VSub_DollarName '$DBG_RESTART_FILE'))}
      ]
      do_arg_iter: F
      body: 
        (command.DoGroup
          children: [
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (command.DBracket
                          expr: 
                            (bool_expr.Unary
                              op_id: Id.BoolUnary_n
                              child: {(DQ ($ Id.VSub_DollarName '$source_file'))}
                            )
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  action: [
                    (command.If
                      arms: [
                        (if_arm
                          cond: [
                            (command.Sentence
                              child: 
                                (command.AndOr
                                  ops: [Id.Op_DAmp]
                                  children: [
                                    (command.DBracket
                                      expr: 
                                        (bool_expr.Unary
                                          op_id: Id.BoolUnary_r
                                          child: {(DQ ($ Id.VSub_DollarName '$source_file'))}
                                        )
                                    )
                                    (command.DBracket
                                      expr: 
                                        (bool_expr.Unary
                                          op_id: Id.BoolUnary_f
                                          child: {(DQ ($ Id.VSub_DollarName '$source_file'))}
                                        )
                                    )
                                  ]
                                )
                              terminator: <Id.Op_Semi _>
                            )
                          ]
                          action: [(C {<source>} {($ Id.VSub_DollarName '$source_file')})]
                          spids: [470 496]
                        )
                      ]
                      else_action: [
                        (C {<_Dbg_errmsg>} 
                          {(DQ <'Unable to read shell script: '> (${ Id.VSub_Name source_file))}
                        )
                      ]
                    )
                  ]
                  spids: [453 467]
                )
              ]
            )
          ]
        )
    )
  ]
)