(command.CommandList
  children: [
    (C {(_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)}
    )
    (command.ShFunction
      name: _Dbg_complete_backtrace
      body: 
        (command.BraceGroup
          children: [
            (C {(typeset)} {(-i)} {(Id.Lit_VarLike 'start=') (0)})
            (command.Sentence
              child: (C {(typeset)} {(-i)} {(end)})
              terminator: (Token id:Id.Op_Semi val:';' span_id:134)
            )
            (command.DParen
              child: 
                (arith_expr.BinaryAssign
                  op_id: Id.Arith_Equal
                  left: (sh_lhs_expr.Name name:end)
                  right: 
                    (arith_expr.Binary
                      op_id: Id.Arith_Minus
                      left: 
                        (arith_expr.VarRef
                          token: (Token id:Id.Lit_ArithVarLike val:_Dbg_stack_size span_id:139)
                        )
                      right: (arith_expr.ArithWord w:{(Id.Lit_Digits 1)})
                    )
                )
            )
            (C {(_Dbg_complete_num_range)} {($ Id.VSub_DollarName '$start')} 
              {($ Id.VSub_DollarName '$end')}
            )
          ]
        )
    )
    (command.ShFunction
      name: _Dbg_do_backtrace
      body: 
        (command.BraceGroup
          children: [
            (command.AndOr
              ops: [Id.Op_DAmp]
              children: [
                (C {(_Dbg_not_running)})
                (command.ControlFlow
                  token: (Token id:Id.ControlFlow_Return val:return span_id:173)
                  arg_word: {(3)}
                )
              ]
            )
            (C {(typeset)} {(-i)} 
              {(Id.Lit_VarLike 'count=') 
                (braced_var_sub
                  token: (Token id:Id.VSub_Number val:1 span_id:185)
                  suffix_op: 
                    (suffix_op.Unary
                      op_id: Id.VTest_ColonHyphen
                      arg_word: {($ Id.VSub_DollarName '$_Dbg_stack_size')}
                    )
                )
              }
            )
            (command.AndOr
              ops: [Id.Op_DPipe]
              children: [
                (C 
                  {
                    (command_sub
                      left_token: (Token id:Id.Left_DollarParen val:'$(' span_id:191)
                      command_list: 
                        (command.CommandList
                          children: [(C {(_Dbg_is_int)} {($ Id.VSub_DollarName '$count')})]
                        )
                    )
                  }
                )
                (command.BraceGroup
                  children: [
                    (C {(_Dbg_errmsg)} 
                      {(DQ ('Bad integer COUNT parameter: ') ($ Id.VSub_DollarName '$count'))}
                    )
                    (command.ControlFlow
                      token: (Token id:Id.ControlFlow_Return val:return span_id:210)
                      arg_word: {(1)}
                    )
                  ]
                )
              ]
            )
            (C {(typeset)} {(-i)} 
              {(Id.Lit_VarLike 'frame_start=') 
                (braced_var_sub
                  token: (Token id:Id.VSub_Number val:2 span_id:225)
                  suffix_op: (suffix_op.Unary op_id:Id.VTest_ColonHyphen arg_word:{(0)})
                )
              }
            )
            (command.AndOr
              ops: [Id.Op_DPipe]
              children: [
                (C 
                  {
                    (command_sub
                      left_token: (Token id:Id.Left_DollarParen val:'$(' span_id:232)
                      command_list: 
                        (command.CommandList
                          children: [(C {(_Dbg_is_int)} {($ Id.VSub_DollarName '$frame_start')})]
                        )
                    )
                  }
                )
                (command.BraceGroup
                  children: [
                    (C {(_Dbg_errmsg)} 
                      {(DQ ('Bad integer parameter: ') ($ Id.VSub_DollarName '$ignore_count'))}
                    )
                    (command.ControlFlow
                      token: (Token id:Id.ControlFlow_Return val:return span_id:251)
                      arg_word: {(1)}
                    )
                  ]
                )
              ]
            )
            (C {(typeset)} {(-i)} {(Id.Lit_VarLike 'i=') (frame_start)})
            (C {(typeset)} {(-li)} {(adjusted_pos)})
            (C {(typeset)} {(filename)})
            (C {(typeset)} {(-i)} {(adjusted_pos)})
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (command.DParen
                          child: 
                            (arith_expr.Binary
                              op_id: Id.Arith_DEqual
                              left: 
                                (arith_expr.VarRef
                                  token: (Token id:Id.Lit_ArithVarLike val:frame_start span_id:325)
                                )
                              right: (arith_expr.ArithWord w:{(Id.Lit_Digits 0)})
                            )
                        )
                      terminator: (Token id:Id.Op_Semi val:';' span_id:334)
                    )
                  ]
                  action: [
                    (command.Sentence
                      child: 
                        (command.DParen
                          child: 
                            (arith_expr.UnaryAssign
                              op_id: Id.Node_PostDMinus
                              child: (sh_lhs_expr.Name name:count)
                            )
                        )
                      terminator: (Token id:Id.Op_Semi val:';' span_id:345)
                    )
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:adjusted_pos)
                          op: assign_op.Equal
                          rhs: 
                            {
                              (command_sub
                                left_token: (Token id:Id.Left_DollarParen val:'$(' span_id:349)
                                command_list: 
                                  (command.CommandList
                                    children: [(C {(_Dbg_frame_adjusted_pos)} {(0)})]
                                  )
                              )
                            }
                          spids: [348]
                        )
                      ]
                    )
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:filename)
                          op: assign_op.Equal
                          rhs: 
                            {
                              (command_sub
                                left_token: (Token id:Id.Left_DollarParen val:'$(' span_id:357)
                                command_list: 
                                  (command.CommandList
                                    children: [
                                      (C {(_Dbg_file_canonic)} 
                                        {
                                          (DQ 
                                            (braced_var_sub
                                              token: 
                                                (Token
                                                  id: Id.VSub_Name
                                                  val: BASH_SOURCE
                                                  span_id: 362
                                                )
                                              bracket_op: 
                                                (bracket_op.ArrayIndex
                                                  expr: 
                                                    (arith_expr.ArithWord
                                                      w: {($ Id.VSub_DollarName '$adjusted_pos')}
                                                    )
                                                )
                                            )
                                          )
                                        }
                                      )
                                    ]
                                  )
                              )
                            }
                          spids: [356]
                        )
                      ]
                    )
                    (C {(_Dbg_frame_print)} 
                      {
                        (command_sub
                          left_token: (Token id:Id.Left_DollarParen val:'$(' span_id:373)
                          command_list: 
                            (command.CommandList
                              children: [(C {(_Dbg_frame_prefix)} {(0)})]
                            )
                        )
                      } {(SQ (Token id:Id.Lit_Chars val:0 span_id:380))} {(SQ )} {(DQ ($ Id.VSub_DollarName '$filename'))} 
                      {(DQ ($ Id.VSub_DollarName '$_Dbg_frame_last_lineno'))} {(SQ )}
                    )
                  ]
                  spids: [321 336]
                )
              ]
            )
            (C {(typeset)} {(-i)} {(skip_fns)})
            (command.DParen
              child: 
                (arith_expr.BinaryAssign
                  op_id: Id.Arith_Equal
                  left: (sh_lhs_expr.Name name:skip_fns)
                  right: 
                    (arith_expr.Binary
                      op_id: Id.Arith_Plus
                      left: 
                        (arith_expr.Binary
                          op_id: Id.Arith_Minus
                          left: 
                            (arith_expr.ArithWord
                              w: 
                                {
                                  (braced_var_sub
                                    token: (Token id:Id.VSub_Name val:FUNCNAME span_id:414)
                                    prefix_op: (Id.VSub_Pound)
                                    bracket_op: (bracket_op.WholeArray op_id:Id.Lit_At)
                                  )
                                }
                            )
                          right: 
                            (arith_expr.VarRef
                              token: (Token id:Id.Lit_ArithVarLike val:_Dbg_stack_size span_id:422)
                            )
                        )
                      right: (arith_expr.ArithWord w:{(Id.Lit_Digits 1)})
                    )
                )
            )
            (C {(_Dbg_frame_set_fn_param)} {($ Id.VSub_DollarName '$skip_fns')})
            (command.ForExpr
              init: 
                (arith_expr.BinaryAssign
                  op_id: Id.Arith_Equal
                  left: (sh_lhs_expr.Name name:i)
                  right: 
                    (arith_expr.Binary
                      op_id: Id.Arith_Plus
                      left: 
                        (arith_expr.VarRef
                          token: (Token id:Id.Lit_ArithVarLike val:frame_start span_id:476)
                        )
                      right: (arith_expr.ArithWord w:{(Id.Lit_Digits 1)})
                    )
                )
              cond: 
                (arith_expr.Binary
                  op_id: Id.Arith_DAmp
                  left: 
                    (arith_expr.Binary
                      op_id: Id.Arith_LessEqual
                      left: (arith_expr.VarRef token:(Token id:Id.Lit_ArithVarLike val:i span_id:483))
                      right: 
                        (arith_expr.VarRef
                          token: (Token id:Id.Lit_ArithVarLike val:_Dbg_stack_size span_id:487)
                        )
                    )
                  right: 
                    (arith_expr.Binary
                      op_id: Id.Arith_Great
                      left: 
                        (arith_expr.VarRef
                          token: (Token id:Id.Lit_ArithVarLike val:count span_id:491)
                        )
                      right: (arith_expr.ArithWord w:{(Id.Lit_Digits 0)})
                    )
                )
              update: (arith_expr.UnaryAssign op_id:Id.Node_PostDPlus child:(sh_lhs_expr.Name name:i))
              body: 
                (command.DoGroup
                  children: [
                    (C {(typeset)} {(-i)} 
                      {(Id.Lit_VarLike 'arg_count=') 
                        (braced_var_sub
                          token: (Token id:Id.VSub_Name val:BASH_ARGC span_id:517)
                          bracket_op: 
                            (bracket_op.ArrayIndex
                              expr: (arith_expr.ArithWord w:{($ Id.VSub_DollarName '$_Dbg_next_argc')})
                            )
                        )
                      }
                    )
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:adjusted_pos)
                          op: assign_op.Equal
                          rhs: 
                            {
                              (command_sub
                                left_token: (Token id:Id.Left_DollarParen val:'$(' span_id:525)
                                command_list: 
                                  (command.CommandList
                                    children: [
                                      (C {(_Dbg_frame_adjusted_pos)} {($ Id.VSub_DollarName '$i')})
                                    ]
                                  )
                              )
                            }
                          spids: [524]
                        )
                      ]
                    )
                    (C {(_Dbg_msg_nocr)} 
                      {
                        (command_sub
                          left_token: (Token id:Id.Left_DollarParen val:'$(' span_id:534)
                          command_list: 
                            (command.CommandList
                              children: [(C {(_Dbg_frame_prefix)} {($ Id.VSub_DollarName '$i')})]
                            )
                        ) ($ Id.VSub_DollarName '$i')
                      } 
                      {
                        (braced_var_sub
                          token: (Token id:Id.VSub_Name val:FUNCNAME span_id:542)
                          bracket_op: 
                            (bracket_op.ArrayIndex
                              expr: 
                                (arith_expr.Binary
                                  op_id: Id.Arith_Minus
                                  left: 
                                    (arith_expr.ArithWord
                                      w: {($ Id.VSub_DollarName '$adjusted_pos')}
                                    )
                                  right: (arith_expr.ArithWord w:{(Id.Lit_Digits 1)})
                                )
                            )
                        )
                      }
                    )
                    (C {(typeset)} {(Id.Lit_VarLike 'parms=') (SQ )})
                    (command.If
                      arms: [
                        (if_arm
                          cond: [
                            (command.Sentence
                              child: 
                                (command.DParen
                                  child: 
                                    (arith_expr.Binary
                                      op_id: Id.Arith_NEqual
                                      left: (arith_expr.ArithWord w:{(Id.Lit_Digits 0)})
                                      right: 
                                        (arith_expr.ArithWord
                                          w: 
                                            {
                                              (braced_var_sub
                                                token: 
                                                  (Token
                                                    id: Id.VSub_Name
                                                    val: BASH_ARGC
                                                    span_id: 574
                                                  )
                                                prefix_op: (Id.VSub_Pound)
                                                bracket_op: (bracket_op.WholeArray op_id:Id.Lit_At)
                                              )
                                            }
                                        )
                                    )
                                )
                              terminator: (Token id:Id.Op_Semi val:';' span_id:583)
                            )
                          ]
                          action: [
                            (C {(_Dbg_frame_fn_param_str)})
                            (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: 
                                                      (Token
                                                        id: Id.VSub_Name
                                                        val: FUNCNAME
                                                        span_id: 596
                                                      )
                                                    bracket_op: 
                                                      (bracket_op.ArrayIndex
                                                        expr: 
                                                          (arith_expr.Binary
                                                            op_id: Id.Arith_Minus
                                                            left: 
                                                              (arith_expr.ArithWord
                                                                w: 
                                                                  {
                                                                    ($ Id.VSub_DollarName 
'$adjusted_pos'
                                                                    )
                                                                  }
                                                              )
                                                            right: 
                                                              (arith_expr.ArithWord
                                                                w: {(Id.Lit_Digits 1)}
                                                              )
                                                          )
                                                      )
                                                  )
                                                }
                                              right: {(DQ (source))}
                                            )
                                        )
                                      terminator: (Token id:Id.Op_Semi val:';' span_id:612)
                                    )
                                  ]
                                  action: [
                                    (command.ShAssignment
                                      pairs: [
                                        (assign_pair
                                          lhs: (sh_lhs_expr.Name name:_Dbg_parm_str)
                                          op: assign_op.Equal
                                          rhs: 
                                            {
                                              (word_part.EscapedLiteral
                                                token: 
                                                  (Token
                                                    id: Id.Lit_EscapedChar
                                                    val: '\\"'
                                                    span_id: 618
                                                  )
                                              ) 
                                              (command_sub
                                                left_token: 
                                                  (Token
                                                    id: Id.Left_DollarParen
                                                    val: '$('
                                                    span_id: 619
                                                  )
                                                command_list: 
                                                  (command.CommandList
                                                    children: [
                                                      (C {(_Dbg_file_canonic)} 
                                                        {
                                                          (DQ 
                                                            (braced_var_sub
                                                              token: 
                                                                (Token
                                                                  id: Id.VSub_Name
                                                                  val: BASH_ARGV
                                                                  span_id: 624
                                                                )
                                                              bracket_op: 
                                                                (bracket_op.ArrayIndex
                                                                  expr: 
                                                                    (arith_expr.Binary
                                                                      op_id: Id.Arith_Minus
                                                                      left: 
                                                                        (arith_expr.ArithWord
                                                                          w: 
                                                                            {
                                                                              ($ Id.VSub_DollarName 
'$_Dbg_next_argv'
                                                                              )
                                                                            }
                                                                        )
                                                                      right: 
                                                                        (arith_expr.ArithWord
                                                                          w: {(Id.Lit_Digits 1)}
                                                                        )
                                                                    )
                                                                )
                                                            )
                                                          )
                                                        }
                                                      )
                                                    ]
                                                  )
                                              ) (word_part.EscapedLiteral token:(Token id:Id.Lit_EscapedChar val:'\\"' span_id:633))
                                            }
                                          spids: [617]
                                        )
                                      ]
                                    )
                                  ]
                                  spids: [591 614]
                                )
                              ]
                            )
                          ]
                          spids: [564 585]
                        )
                      ]
                    )
                    (C {(typeset)} {(-l)} {(lineno)})
                    (command.If
                      arms: [
                        (if_arm
                          cond: [
                            (command.Sentence
                              child: 
                                (command.DParen
                                  child: 
                                    (arith_expr.Binary
                                      op_id: Id.Arith_DEqual
                                      left: 
                                        (arith_expr.VarRef
                                          token: 
                                            (Token
                                              id: Id.Lit_ArithVarLike
                                              val: adjusted_pos
                                              span_id: 654
                                            )
                                        )
                                      right: 
                                        (arith_expr.ArithWord
                                          w: 
                                            {
                                              (braced_var_sub
                                                token: 
                                                  (Token
                                                    id: Id.VSub_Name
                                                    val: BASH_SOURCE
                                                    span_id: 660
                                                  )
                                                prefix_op: (Id.VSub_Pound)
                                                bracket_op: (bracket_op.WholeArray op_id:Id.Lit_At)
                                              )
                                            }
                                        )
                                    )
                                )
                              terminator: (Token id:Id.Op_Semi val:';' span_id:669)
                            )
                          ]
                          action: [
                            (command.ShAssignment
                              pairs: [
                                (assign_pair
                                  lhs: (sh_lhs_expr.Name name:lineno)
                                  op: assign_op.Equal
                                  rhs: {(0)}
                                  spids: [674]
                                )
                              ]
                            )
                            (command.DParen
                              child: 
                                (arith_expr.UnaryAssign
                                  op_id: Id.Node_PostDMinus
                                  child: (sh_lhs_expr.Name name:adjusted_pos)
                                )
                            )
                          ]
                          spids: [650 671]
                        )
                      ]
                      else_action: [
                        (command.ShAssignment
                          pairs: [
                            (assign_pair
                              lhs: (sh_lhs_expr.Name name:lineno)
                              op: assign_op.Equal
                              rhs: 
                                {
                                  (braced_var_sub
                                    token: (Token id:Id.VSub_Name val:BASH_LINENO span_id:690)
                                    bracket_op: 
                                      (bracket_op.ArrayIndex
                                        expr: 
                                          (arith_expr.Binary
                                            op_id: Id.Arith_Minus
                                            left: 
                                              (arith_expr.ArithWord
                                                w: {($ Id.VSub_DollarName '$adjusted_pos')}
                                              )
                                            right: (arith_expr.ArithWord w:{(Id.Lit_Digits 1)})
                                          )
                                      )
                                  )
                                }
                              spids: [688]
                            )
                          ]
                        )
                      ]
                    )
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:filename)
                          op: assign_op.Equal
                          rhs: 
                            {
                              (command_sub
                                left_token: (Token id:Id.Left_DollarParen val:'$(' span_id:703)
                                command_list: 
                                  (command.CommandList
                                    children: [
                                      (C {(_Dbg_file_canonic)} 
                                        {
                                          (DQ 
                                            (braced_var_sub
                                              token: 
                                                (Token
                                                  id: Id.VSub_Name
                                                  val: BASH_SOURCE
                                                  span_id: 708
                                                )
                                              bracket_op: 
                                                (bracket_op.ArrayIndex
                                                  expr: 
                                                    (arith_expr.ArithWord
                                                      w: {($ Id.VSub_DollarName '$adjusted_pos')}
                                                    )
                                                )
                                            )
                                          )
                                        }
                                      )
                                    ]
                                  )
                              )
                            }
                          spids: [702]
                        )
                      ]
                    )
                    (C {(_Dbg_msg)} 
                      {
                        (DQ ('(') ($ Id.VSub_DollarName '$_Dbg_parm_str') (') called from file ') 
                          (word_part.EscapedLiteral
                            token: (Token id:Id.Lit_EscapedChar val:'\\`' span_id:723)
                          ) ($ Id.VSub_DollarName '$filename') ("'")
                        )
                      } {(DQ ('at line ') ($ Id.VSub_DollarName '$lineno'))}
                    )
                    (command.DParen
                      child: 
                        (arith_expr.UnaryAssign
                          op_id: Id.Node_PostDMinus
                          child: (sh_lhs_expr.Name name:count)
                        )
                    )
                  ]
                )
            )
            (command.ControlFlow
              token: (Token id:Id.ControlFlow_Return val:return span_id:745)
              arg_word: {(0)}
            )
          ]
        )
    )
    (C {(_Dbg_alias_add)} {(bt)} {(backtrace)})
    (C {(_Dbg_alias_add)} {(T)} {(backtrace)})
    (C {(_Dbg_alias_add)} {(where)} {(backtrace)})
  ]
)