(command.CommandList
  children: [
    (command.Simple
      blame_tok: <_Dbg_help_add>
      more_env: []
      words: [
        {<_Dbg_help_add>}
        {<backtrace>}
        {
          (DQ <'**backtrace** [*n*]\n'> <'\n'> 
            <'Print a backtrace of calling functions and sourced files.\n'> <'\n'> <'files. If *n* is given, list only *n* calls.\n'> <'\n'> <'Examples:\n'> <'---------\n'> <'\n'> 
            <'   backtrace    # Print a full stack trace\n'> <'   backtrace 2  # Print only the top two entries\n'>
          )
        }
        {<1>}
        {<_Dbg_complete_backtrace>}
      ]
      redirects: []
      do_fork: T
    )
    (command.ShFunction
      name_tok: <_Dbg_complete_backtrace>
      name: _Dbg_complete_backtrace
      body: 
        (BraceGroup
          left: <Id.Lit_LBrace '{'>
          children: [
            (command.Simple
              blame_tok: <typeset>
              more_env: []
              words: [{<typeset>} {<-i>} {<Id.Lit_VarLike 'start='> <0>}]
              redirects: []
              do_fork: T
            )
            (command.Sentence
              child: 
                (command.Simple
                  blame_tok: <typeset>
                  more_env: []
                  words: [{<typeset>} {<-i>} {<end>}]
                  redirects: []
                  do_fork: T
                )
              terminator: <Id.Op_Semi _>
            )
            (command.DParen
              left: <Id.Op_DLeftParen _>
              child: 
                (arith_expr.BinaryAssign
                  op_id: Id.Arith_Equal
                  left: ($ Id.Lit_ArithVarLike end)
                  right: 
                    (arith_expr.Binary
                      op_id: Id.Arith_Minus
                      left: ($ Id.Lit_ArithVarLike _Dbg_stack_size)
                      right: {<Id.Lit_Digits 1>}
                    )
                )
              right: <Id.Op_DRightParen _>
              redirects: []
            )
            (command.Simple
              blame_tok: <_Dbg_complete_num_range>
              more_env: []
              words: [
                {<_Dbg_complete_num_range>}
                {($ Id.VSub_DollarName start)}
                {($ Id.VSub_DollarName end)}
              ]
              redirects: []
              do_fork: T
            )
          ]
          redirects: []
          right: <Id.Lit_RBrace '}'>
        )
    )
    (command.ShFunction
      keyword: <Id.KW_Function function>
      name_tok: <_Dbg_do_backtrace>
      name: _Dbg_do_backtrace
      body: 
        (BraceGroup
          left: <Id.Lit_LBrace '{'>
          children: [
            (command.AndOr
              children: [
                (command.Simple
                  blame_tok: <_Dbg_not_running>
                  more_env: []
                  words: [{<_Dbg_not_running>}]
                  redirects: []
                  do_fork: T
                )
                (command.ControlFlow
                  keyword: <Id.ControlFlow_Return return>
                  arg_word: {<3>}
                )
              ]
              ops: [<Id.Op_DAmp _>]
            )
            (command.Simple
              blame_tok: <typeset>
              more_env: []
              words: [
                {<typeset>}
                {<-i>}
                {<Id.Lit_VarLike 'count='> 
                  (BracedVarSub
                    left: <Id.Left_DollarBrace '${'>
                    token: <Id.VSub_Number 1>
                    var_name: 1
                    suffix_op: 
                      (suffix_op.Unary
                        op: <Id.VTest_ColonHyphen _>
                        arg_word: {($ Id.VSub_DollarName _Dbg_stack_size)}
                      )
                    right: <Id.Right_DollarBrace '}'>
                  )
                }
              ]
              redirects: []
              do_fork: T
            )
            (command.AndOr
              children: [
                (command.Simple
                  blame_tok: <Id.Left_DollarParen '$('>
                  more_env: []
                  words: [
                    {
                      (CommandSub
                        left_token: <Id.Left_DollarParen '$('>
                        child: 
                          (command.Simple
                            blame_tok: <_Dbg_is_int>
                            more_env: []
                            words: [{<_Dbg_is_int>} {($ Id.VSub_DollarName count)}]
                            redirects: []
                            do_fork: T
                          )
                        right: <Id.Eof_RParen _>
                      )
                    }
                  ]
                  redirects: []
                  do_fork: T
                )
                (BraceGroup
                  left: <Id.Lit_LBrace '{'>
                  children: [
                    (command.Simple
                      blame_tok: <_Dbg_errmsg>
                      more_env: []
                      words: [
                        {<_Dbg_errmsg>}
                        {(DQ <'Bad integer COUNT parameter: '> ($ Id.VSub_DollarName count))}
                      ]
                      redirects: []
                      do_fork: T
                    )
                    (command.ControlFlow
                      keyword: <Id.ControlFlow_Return return>
                      arg_word: {<1>}
                    )
                  ]
                  redirects: []
                  right: <Id.Lit_RBrace '}'>
                )
              ]
              ops: [<Id.Op_DPipe _>]
            )
            (command.Simple
              blame_tok: <typeset>
              more_env: []
              words: [
                {<typeset>}
                {<-i>}
                {<Id.Lit_VarLike 'frame_start='> 
                  (BracedVarSub
                    left: <Id.Left_DollarBrace '${'>
                    token: <Id.VSub_Number 2>
                    var_name: 2
                    suffix_op: (suffix_op.Unary op:<Id.VTest_ColonHyphen _> arg_word:{<0>})
                    right: <Id.Right_DollarBrace '}'>
                  )
                }
              ]
              redirects: []
              do_fork: T
            )
            (command.AndOr
              children: [
                (command.Simple
                  blame_tok: <Id.Left_DollarParen '$('>
                  more_env: []
                  words: [
                    {
                      (CommandSub
                        left_token: <Id.Left_DollarParen '$('>
                        child: 
                          (command.Simple
                            blame_tok: <_Dbg_is_int>
                            more_env: []
                            words: [{<_Dbg_is_int>} {($ Id.VSub_DollarName frame_start)}]
                            redirects: []
                            do_fork: T
                          )
                        right: <Id.Eof_RParen _>
                      )
                    }
                  ]
                  redirects: []
                  do_fork: T
                )
                (BraceGroup
                  left: <Id.Lit_LBrace '{'>
                  children: [
                    (command.Simple
                      blame_tok: <_Dbg_errmsg>
                      more_env: []
                      words: [
                        {<_Dbg_errmsg>}
                        {(DQ <'Bad integer parameter: '> ($ Id.VSub_DollarName ignore_count))}
                      ]
                      redirects: []
                      do_fork: T
                    )
                    (command.ControlFlow
                      keyword: <Id.ControlFlow_Return return>
                      arg_word: {<1>}
                    )
                  ]
                  redirects: []
                  right: <Id.Lit_RBrace '}'>
                )
              ]
              ops: [<Id.Op_DPipe _>]
            )
            (command.Simple
              blame_tok: <typeset>
              more_env: []
              words: [{<typeset>} {<-i>} {<Id.Lit_VarLike 'i='> <frame_start>}]
              redirects: []
              do_fork: T
            )
            (command.Simple
              blame_tok: <typeset>
              more_env: []
              words: [{<typeset>} {<-li>} {<adjusted_pos>}]
              redirects: []
              do_fork: T
            )
            (command.Simple
              blame_tok: <typeset>
              more_env: []
              words: [{<typeset>} {<filename>}]
              redirects: []
              do_fork: T
            )
            (command.Simple
              blame_tok: <typeset>
              more_env: []
              words: [{<typeset>} {<-i>} {<adjusted_pos>}]
              redirects: []
              do_fork: T
            )
            (command.If
              if_kw: <Id.KW_If if>
              arms: [
                (IfArm
                  keyword: <Id.KW_If if>
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.DParen
                              left: <Id.Op_DLeftParen _>
                              child: 
                                (arith_expr.Binary
                                  op_id: Id.Arith_DEqual
                                  left: ($ Id.Lit_ArithVarLike frame_start)
                                  right: {<Id.Lit_Digits 0>}
                                )
                              right: <Id.Op_DRightParen _>
                              redirects: []
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  then_kw: <Id.KW_Then then>
                  action: [
                    (command.Sentence
                      child: 
                        (command.DParen
                          left: <Id.Op_DLeftParen _>
                          child: 
                            (arith_expr.UnaryAssign
                              op_id: Id.Node_PostDMinus
                              child: ($ Id.Lit_ArithVarLike count)
                            )
                          right: <Id.Op_DRightParen _>
                          redirects: []
                        )
                      terminator: <Id.Op_Semi _>
                    )
                    (command.ShAssignment
                      left: <Id.Lit_VarLike 'adjusted_pos='>
                      pairs: [
                        (AssignPair
                          left: <Id.Lit_VarLike 'adjusted_pos='>
                          lhs: 
                            (sh_lhs_expr.Name
                              left: <Id.Lit_VarLike 'adjusted_pos='>
                              name: adjusted_pos
                            )
                          op: assign_op.Equal
                          rhs: 
                            {
                              (CommandSub
                                left_token: <Id.Left_DollarParen '$('>
                                child: 
                                  (command.Simple
                                    blame_tok: <_Dbg_frame_adjusted_pos>
                                    more_env: []
                                    words: [{<_Dbg_frame_adjusted_pos>} {<0>}]
                                    redirects: []
                                    do_fork: T
                                  )
                                right: <Id.Eof_RParen _>
                              )
                            }
                        )
                      ]
                      redirects: []
                    )
                    (command.ShAssignment
                      left: <Id.Lit_VarLike 'filename='>
                      pairs: [
                        (AssignPair
                          left: <Id.Lit_VarLike 'filename='>
                          lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'filename='> name:filename)
                          op: assign_op.Equal
                          rhs: 
                            {
                              (CommandSub
                                left_token: <Id.Left_DollarParen '$('>
                                child: 
                                  (command.Simple
                                    blame_tok: <_Dbg_file_canonic>
                                    more_env: []
                                    words: [
                                      {<_Dbg_file_canonic>}
                                      {
                                        (DQ 
                                          (BracedVarSub
                                            left: <Id.Left_DollarBrace '${'>
                                            token: <Id.VSub_Name BASH_SOURCE>
                                            var_name: BASH_SOURCE
                                            bracket_op: 
                                              (bracket_op.ArrayIndex
                                                expr: {($ Id.VSub_DollarName adjusted_pos)}
                                              )
                                            right: <Id.Right_DollarBrace '}'>
                                          )
                                        )
                                      }
                                    ]
                                    redirects: []
                                    do_fork: T
                                  )
                                right: <Id.Eof_RParen _>
                              )
                            }
                        )
                      ]
                      redirects: []
                    )
                    (command.Simple
                      blame_tok: <_Dbg_frame_print>
                      more_env: []
                      words: [
                        {<_Dbg_frame_print>}
                        {
                          (CommandSub
                            left_token: <Id.Left_DollarParen '$('>
                            child: 
                              (command.Simple
                                blame_tok: <_Dbg_frame_prefix>
                                more_env: []
                                words: [{<_Dbg_frame_prefix>} {<0>}]
                                redirects: []
                                do_fork: T
                              )
                            right: <Id.Eof_RParen _>
                          )
                        }
                        {(SQ <0>)}
                        {(SQ )}
                        {(DQ ($ Id.VSub_DollarName filename))}
                        {(DQ ($ Id.VSub_DollarName _Dbg_frame_last_lineno))}
                        {(SQ )}
                      ]
                      redirects: []
                      do_fork: T
                    )
                  ]
                  spids: [321 336]
                )
              ]
              else_action: []
              fi_kw: <Id.KW_Fi fi>
              redirects: []
            )
            (command.Simple
              blame_tok: <typeset>
              more_env: []
              words: [{<typeset>} {<-i>} {<skip_fns>}]
              redirects: []
              do_fork: T
            )
            (command.DParen
              left: <Id.Op_DLeftParen _>
              child: 
                (arith_expr.BinaryAssign
                  op_id: Id.Arith_Equal
                  left: ($ Id.Lit_ArithVarLike skip_fns)
                  right: 
                    (arith_expr.Binary
                      op_id: Id.Arith_Plus
                      left: 
                        (arith_expr.Binary
                          op_id: Id.Arith_Minus
                          left: 
                            {
                              (BracedVarSub
                                left: <Id.Left_DollarBrace '${'>
                                token: <Id.VSub_Name FUNCNAME>
                                var_name: FUNCNAME
                                prefix_op: <Id.VSub_Pound '#'>
                                bracket_op: (bracket_op.WholeArray op_id:Id.Lit_At)
                                right: <Id.Right_DollarBrace '}'>
                              )
                            }
                          right: ($ Id.Lit_ArithVarLike _Dbg_stack_size)
                        )
                      right: {<Id.Lit_Digits 1>}
                    )
                )
              right: <Id.Op_DRightParen _>
              redirects: []
            )
            (command.Simple
              blame_tok: <_Dbg_frame_set_fn_param>
              more_env: []
              words: [{<_Dbg_frame_set_fn_param>} {($ Id.VSub_DollarName skip_fns)}]
              redirects: []
              do_fork: T
            )
            (command.ForExpr
              keyword: <Id.KW_For for>
              init: 
                (arith_expr.BinaryAssign
                  op_id: Id.Arith_Equal
                  left: ($ Id.Lit_ArithVarLike i)
                  right: 
                    (arith_expr.Binary
                      op_id: Id.Arith_Plus
                      left: ($ Id.Lit_ArithVarLike frame_start)
                      right: {<Id.Lit_Digits 1>}
                    )
                )
              cond: 
                (arith_expr.Binary
                  op_id: Id.Arith_DAmp
                  left: 
                    (arith_expr.Binary
                      op_id: Id.Arith_LessEqual
                      left: ($ Id.Lit_ArithVarLike i)
                      right: ($ Id.Lit_ArithVarLike _Dbg_stack_size)
                    )
                  right: 
                    (arith_expr.Binary
                      op_id: Id.Arith_Great
                      left: ($ Id.Lit_ArithVarLike count)
                      right: {<Id.Lit_Digits 0>}
                    )
                )
              update: (arith_expr.UnaryAssign op_id:Id.Node_PostDPlus child:($ Id.Lit_ArithVarLike i))
              body: 
                (command.DoGroup
                  left: <Id.KW_Do do>
                  children: [
                    (command.Simple
                      blame_tok: <typeset>
                      more_env: []
                      words: [
                        {<typeset>}
                        {<-i>}
                        {<Id.Lit_VarLike 'arg_count='> 
                          (BracedVarSub
                            left: <Id.Left_DollarBrace '${'>
                            token: <Id.VSub_Name BASH_ARGC>
                            var_name: BASH_ARGC
                            bracket_op: 
                              (bracket_op.ArrayIndex
                                expr: {($ Id.VSub_DollarName _Dbg_next_argc)}
                              )
                            right: <Id.Right_DollarBrace '}'>
                          )
                        }
                      ]
                      redirects: []
                      do_fork: T
                    )
                    (command.ShAssignment
                      left: <Id.Lit_VarLike 'adjusted_pos='>
                      pairs: [
                        (AssignPair
                          left: <Id.Lit_VarLike 'adjusted_pos='>
                          lhs: 
                            (sh_lhs_expr.Name
                              left: <Id.Lit_VarLike 'adjusted_pos='>
                              name: adjusted_pos
                            )
                          op: assign_op.Equal
                          rhs: 
                            {
                              (CommandSub
                                left_token: <Id.Left_DollarParen '$('>
                                child: 
                                  (command.Simple
                                    blame_tok: <_Dbg_frame_adjusted_pos>
                                    more_env: []
                                    words: [{<_Dbg_frame_adjusted_pos>} {($ Id.VSub_DollarName i)}]
                                    redirects: []
                                    do_fork: T
                                  )
                                right: <Id.Eof_RParen _>
                              )
                            }
                        )
                      ]
                      redirects: []
                    )
                    (command.Simple
                      blame_tok: <_Dbg_msg_nocr>
                      more_env: []
                      words: [
                        {<_Dbg_msg_nocr>}
                        {
                          (CommandSub
                            left_token: <Id.Left_DollarParen '$('>
                            child: 
                              (command.Simple
                                blame_tok: <_Dbg_frame_prefix>
                                more_env: []
                                words: [{<_Dbg_frame_prefix>} {($ Id.VSub_DollarName i)}]
                                redirects: []
                                do_fork: T
                              )
                            right: <Id.Eof_RParen _>
                          ) ($ Id.VSub_DollarName i)
                        }
                        {
                          (BracedVarSub
                            left: <Id.Left_DollarBrace '${'>
                            token: <Id.VSub_Name FUNCNAME>
                            var_name: FUNCNAME
                            bracket_op: 
                              (bracket_op.ArrayIndex
                                expr: 
                                  (arith_expr.Binary
                                    op_id: Id.Arith_Minus
                                    left: {($ Id.VSub_DollarName adjusted_pos)}
                                    right: {<Id.Lit_Digits 1>}
                                  )
                              )
                            right: <Id.Right_DollarBrace '}'>
                          )
                        }
                      ]
                      redirects: []
                      do_fork: T
                    )
                    (command.Simple
                      blame_tok: <typeset>
                      more_env: []
                      words: [{<typeset>} {<Id.Lit_VarLike 'parms='> (SQ )}]
                      redirects: []
                      do_fork: T
                    )
                    (command.If
                      if_kw: <Id.KW_If if>
                      arms: [
                        (IfArm
                          keyword: <Id.KW_If if>
                          cond: 
                            (condition.Shell
                              commands: [
                                (command.Sentence
                                  child: 
                                    (command.DParen
                                      left: <Id.Op_DLeftParen _>
                                      child: 
                                        (arith_expr.Binary
                                          op_id: Id.Arith_NEqual
                                          left: {<Id.Lit_Digits 0>}
                                          right: 
                                            {
                                              (BracedVarSub
                                                left: <Id.Left_DollarBrace '${'>
                                                token: <Id.VSub_Name BASH_ARGC>
                                                var_name: BASH_ARGC
                                                prefix_op: <Id.VSub_Pound '#'>
                                                bracket_op: (bracket_op.WholeArray op_id:Id.Lit_At)
                                                right: <Id.Right_DollarBrace '}'>
                                              )
                                            }
                                        )
                                      right: <Id.Op_DRightParen _>
                                      redirects: []
                                    )
                                  terminator: <Id.Op_Semi _>
                                )
                              ]
                            )
                          then_kw: <Id.KW_Then then>
                          action: [
                            (command.Simple
                              blame_tok: <_Dbg_frame_fn_param_str>
                              more_env: []
                              words: [{<_Dbg_frame_fn_param_str>}]
                              redirects: []
                              do_fork: T
                            )
                            (command.If
                              if_kw: <Id.KW_If if>
                              arms: [
                                (IfArm
                                  keyword: <Id.KW_If if>
                                  cond: 
                                    (condition.Shell
                                      commands: [
                                        (command.Sentence
                                          child: 
                                            (command.DBracket
                                              left: <Id.KW_DLeftBracket '[['>
                                              expr: 
                                                (bool_expr.Binary
                                                  op_id: Id.BoolBinary_GlobDEqual
                                                  left: 
                                                    {
                                                      (BracedVarSub
                                                        left: <Id.Left_DollarBrace '${'>
                                                        token: <Id.VSub_Name FUNCNAME>
                                                        var_name: FUNCNAME
                                                        bracket_op: 
                                                          (bracket_op.ArrayIndex
                                                            expr: 
                                                              (arith_expr.Binary
                                                                op_id: Id.Arith_Minus
                                                                left: 
                                                                  {
                                                                    ($ Id.VSub_DollarName 
adjusted_pos
                                                                    )
                                                                  }
                                                                right: {<Id.Lit_Digits 1>}
                                                              )
                                                          )
                                                        right: <Id.Right_DollarBrace '}'>
                                                      )
                                                    }
                                                  right: {(DQ <source>)}
                                                )
                                              right: <Id.Lit_DRightBracket ']]'>
                                              redirects: []
                                            )
                                          terminator: <Id.Op_Semi _>
                                        )
                                      ]
                                    )
                                  then_kw: <Id.KW_Then then>
                                  action: [
                                    (command.ShAssignment
                                      left: <Id.Lit_VarLike '_Dbg_parm_str='>
                                      pairs: [
                                        (AssignPair
                                          left: <Id.Lit_VarLike '_Dbg_parm_str='>
                                          lhs: 
                                            (sh_lhs_expr.Name
                                              left: <Id.Lit_VarLike '_Dbg_parm_str='>
                                              name: _Dbg_parm_str
                                            )
                                          op: assign_op.Equal
                                          rhs: 
                                            {
                                              (word_part.EscapedLiteral
                                                token: <Id.Lit_EscapedChar '\\"'>
                                                ch: '"'
                                              ) 
                                              (CommandSub
                                                left_token: <Id.Left_DollarParen '$('>
                                                child: 
                                                  (command.Simple
                                                    blame_tok: <_Dbg_file_canonic>
                                                    more_env: []
                                                    words: [
                                                      {<_Dbg_file_canonic>}
                                                      {
                                                        (DQ 
                                                          (BracedVarSub
                                                            left: <Id.Left_DollarBrace '${'>
                                                            token: <Id.VSub_Name BASH_ARGV>
                                                            var_name: BASH_ARGV
                                                            bracket_op: 
                                                              (bracket_op.ArrayIndex
                                                                expr: 
                                                                  (arith_expr.Binary
                                                                    op_id: Id.Arith_Minus
                                                                    left: 
                                                                      {
                                                                        ($ Id.VSub_DollarName 
_Dbg_next_argv
                                                                        )
                                                                      }
                                                                    right: {<Id.Lit_Digits 1>}
                                                                  )
                                                              )
                                                            right: <Id.Right_DollarBrace '}'>
                                                          )
                                                        )
                                                      }
                                                    ]
                                                    redirects: []
                                                    do_fork: T
                                                  )
                                                right: <Id.Eof_RParen _>
                                              ) (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'> ch:'"')
                                            }
                                        )
                                      ]
                                      redirects: []
                                    )
                                  ]
                                  spids: [591 614]
                                )
                              ]
                              else_action: []
                              fi_kw: <Id.KW_Fi fi>
                              redirects: []
                            )
                          ]
                          spids: [564 585]
                        )
                      ]
                      else_action: []
                      fi_kw: <Id.KW_Fi fi>
                      redirects: []
                    )
                    (command.Simple
                      blame_tok: <typeset>
                      more_env: []
                      words: [{<typeset>} {<-l>} {<lineno>}]
                      redirects: []
                      do_fork: T
                    )
                    (command.If
                      if_kw: <Id.KW_If if>
                      arms: [
                        (IfArm
                          keyword: <Id.KW_If if>
                          cond: 
                            (condition.Shell
                              commands: [
                                (command.Sentence
                                  child: 
                                    (command.DParen
                                      left: <Id.Op_DLeftParen _>
                                      child: 
                                        (arith_expr.Binary
                                          op_id: Id.Arith_DEqual
                                          left: ($ Id.Lit_ArithVarLike adjusted_pos)
                                          right: 
                                            {
                                              (BracedVarSub
                                                left: <Id.Left_DollarBrace '${'>
                                                token: <Id.VSub_Name BASH_SOURCE>
                                                var_name: BASH_SOURCE
                                                prefix_op: <Id.VSub_Pound '#'>
                                                bracket_op: (bracket_op.WholeArray op_id:Id.Lit_At)
                                                right: <Id.Right_DollarBrace '}'>
                                              )
                                            }
                                        )
                                      right: <Id.Op_DRightParen _>
                                      redirects: []
                                    )
                                  terminator: <Id.Op_Semi _>
                                )
                              ]
                            )
                          then_kw: <Id.KW_Then then>
                          action: [
                            (command.ShAssignment
                              left: <Id.Lit_VarLike 'lineno='>
                              pairs: [
                                (AssignPair
                                  left: <Id.Lit_VarLike 'lineno='>
                                  lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'lineno='> name:lineno)
                                  op: assign_op.Equal
                                  rhs: {<0>}
                                )
                              ]
                              redirects: []
                            )
                            (command.DParen
                              left: <Id.Op_DLeftParen _>
                              child: 
                                (arith_expr.UnaryAssign
                                  op_id: Id.Node_PostDMinus
                                  child: ($ Id.Lit_ArithVarLike adjusted_pos)
                                )
                              right: <Id.Op_DRightParen _>
                              redirects: []
                            )
                          ]
                          spids: [650 671]
                        )
                      ]
                      else_kw: <Id.KW_Else else>
                      else_action: [
                        (command.ShAssignment
                          left: <Id.Lit_VarLike 'lineno='>
                          pairs: [
                            (AssignPair
                              left: <Id.Lit_VarLike 'lineno='>
                              lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'lineno='> name:lineno)
                              op: assign_op.Equal
                              rhs: 
                                {
                                  (BracedVarSub
                                    left: <Id.Left_DollarBrace '${'>
                                    token: <Id.VSub_Name BASH_LINENO>
                                    var_name: BASH_LINENO
                                    bracket_op: 
                                      (bracket_op.ArrayIndex
                                        expr: 
                                          (arith_expr.Binary
                                            op_id: Id.Arith_Minus
                                            left: {($ Id.VSub_DollarName adjusted_pos)}
                                            right: {<Id.Lit_Digits 1>}
                                          )
                                      )
                                    right: <Id.Right_DollarBrace '}'>
                                  )
                                }
                            )
                          ]
                          redirects: []
                        )
                      ]
                      fi_kw: <Id.KW_Fi fi>
                      redirects: []
                    )
                    (command.ShAssignment
                      left: <Id.Lit_VarLike 'filename='>
                      pairs: [
                        (AssignPair
                          left: <Id.Lit_VarLike 'filename='>
                          lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'filename='> name:filename)
                          op: assign_op.Equal
                          rhs: 
                            {
                              (CommandSub
                                left_token: <Id.Left_DollarParen '$('>
                                child: 
                                  (command.Simple
                                    blame_tok: <_Dbg_file_canonic>
                                    more_env: []
                                    words: [
                                      {<_Dbg_file_canonic>}
                                      {
                                        (DQ 
                                          (BracedVarSub
                                            left: <Id.Left_DollarBrace '${'>
                                            token: <Id.VSub_Name BASH_SOURCE>
                                            var_name: BASH_SOURCE
                                            bracket_op: 
                                              (bracket_op.ArrayIndex
                                                expr: {($ Id.VSub_DollarName adjusted_pos)}
                                              )
                                            right: <Id.Right_DollarBrace '}'>
                                          )
                                        )
                                      }
                                    ]
                                    redirects: []
                                    do_fork: T
                                  )
                                right: <Id.Eof_RParen _>
                              )
                            }
                        )
                      ]
                      redirects: []
                    )
                    (command.Simple
                      blame_tok: <_Dbg_msg>
                      more_env: []
                      words: [
                        {<_Dbg_msg>}
                        {
                          (DQ <'('> ($ Id.VSub_DollarName _Dbg_parm_str) <') called from file '> 
                            (word_part.EscapedLiteral
                              token: <Id.Lit_EscapedChar '\\`'>
                              ch: '`'
                            ) ($ Id.VSub_DollarName filename) <'\''>
                          )
                        }
                        {(DQ <'at line '> ($ Id.VSub_DollarName lineno))}
                      ]
                      redirects: []
                      do_fork: T
                    )
                    (command.DParen
                      left: <Id.Op_DLeftParen _>
                      child: 
                        (arith_expr.UnaryAssign
                          op_id: Id.Node_PostDMinus
                          child: ($ Id.Lit_ArithVarLike count)
                        )
                      right: <Id.Op_DRightParen _>
                      redirects: []
                    )
                  ]
                  right: <Id.KW_Done done>
                )
              redirects: []
            )
            (command.ControlFlow keyword:<Id.ControlFlow_Return return> arg_word:{<0>})
          ]
          redirects: []
          right: <Id.Lit_RBrace '}'>
        )
    )
    (command.Simple
      blame_tok: <_Dbg_alias_add>
      more_env: []
      words: [{<_Dbg_alias_add>} {<bt>} {<backtrace>}]
      redirects: []
      do_fork: T
    )
    (command.Simple
      blame_tok: <_Dbg_alias_add>
      more_env: []
      words: [{<_Dbg_alias_add>} {<T>} {<backtrace>}]
      redirects: []
      do_fork: T
    )
    (command.Simple
      blame_tok: <_Dbg_alias_add>
      more_env: []
      words: [{<_Dbg_alias_add>} {<where>} {<backtrace>}]
      redirects: []
      do_fork: T
    )
  ]
)