(command.CommandList
  children: [
    (C {<typeset>} {<-i>} {<_Dbg_stack_size>})
    (C {<typeset>} {<-i>} {<_Dbg_stack_pos>})
    (C {<typeset>} {<Id.Lit_VarLike '_Dbg_frame_last_filename='> (SQ )})
    (C {<typeset>} {<-i>} {<Id.Lit_VarLike '_Dbg_frame_last_lineno='> <0>})
    (command.ShFunction
      name: _Dbg_frame_adjust
      body: 
        (BraceGroup
          children: [
            (command.AndOr
              ops: [Id.Op_DAmp]
              children: [
                (command.DParen
                  child: 
                    (arith_expr.Binary
                      op_id: Id.Arith_NEqual
                      left: {($ Id.VSub_Pound '$#')}
                      right: {<Id.Lit_Digits 2>}
                    )
                )
                (command.ControlFlow
                  token: <Id.ControlFlow_Return return>
                  arg_word: {<255>}
                )
              ]
            )
            (C {<typeset>} {<-i>} {<Id.Lit_VarLike 'count='> ($ Id.VSub_Number '$1')})
            (C {<typeset>} {<-i>} {<Id.Lit_VarLike 'signum='> ($ Id.VSub_Number '$2')})
            (C {<typeset>} {<-i>} {<retval>})
            (command.AndOr
              ops: [Id.Op_DPipe]
              children: [
                (C {<_Dbg_frame_int_setup>} {($ Id.VSub_DollarName '$count')})
                (command.ControlFlow
                  token: <Id.ControlFlow_Return return>
                  arg_word: {<2>}
                )
              ]
            )
            (C {<typeset>} {<-i>} {<pos>})
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.DParen
                              child: 
                                (arith_expr.Binary
                                  op_id: Id.Arith_DEqual
                                  left: <Id.Lit_ArithVarLike signum>
                                  right: {<Id.Lit_Digits 0>}
                                )
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [
                    (command.If
                      arms: [
                        (if_arm
                          cond: 
                            (condition.Shell
                              commands: [
                                (command.Sentence
                                  child: 
                                    (command.DParen
                                      child: 
                                        (arith_expr.Binary
                                          op_id: Id.Arith_Less
                                          left: <Id.Lit_ArithVarLike count>
                                          right: {<Id.Lit_Digits 0>}
                                        )
                                    )
                                  terminator: <Id.Op_Semi _>
                                )
                              ]
                            )
                          action: [
                            (command.DParen
                              child: 
                                (arith_expr.BinaryAssign
                                  op_id: Id.Arith_Equal
                                  left: <Id.Lit_ArithVarLike pos>
                                  right: 
                                    (arith_expr.Binary
                                      op_id: Id.Arith_Minus
                                      left: 
                                        (arith_expr.Binary
                                          op_id: Id.Arith_Plus
                                          left: <Id.Lit_ArithVarLike _Dbg_stack_size>
                                          right: <Id.Lit_ArithVarLike count>
                                        )
                                      right: {<Id.Lit_Digits 1>}
                                    )
                                )
                            )
                          ]
                          spids: [219 234]
                        )
                      ]
                      else_action: [
                        (command.DParen
                          child: 
                            (arith_expr.BinaryAssign
                              op_id: Id.Arith_Equal
                              left: <Id.Lit_ArithVarLike pos>
                              right: <Id.Lit_ArithVarLike count>
                            )
                        )
                      ]
                    )
                  ]
                  spids: [203 216]
                )
              ]
              else_action: [
                (command.DParen
                  child: 
                    (arith_expr.BinaryAssign
                      op_id: Id.Arith_Equal
                      left: <Id.Lit_ArithVarLike pos>
                      right: 
                        (arith_expr.Binary
                          op_id: Id.Arith_Plus
                          left: <Id.Lit_ArithVarLike _Dbg_stack_pos>
                          right: 
                            (arith_expr.Binary
                              op_id: Id.Arith_Star
                              left: <Id.Lit_ArithVarLike count>
                              right: <Id.Lit_ArithVarLike signum>
                            )
                        )
                    )
                )
              ]
            )
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.DParen
                              child: 
                                (arith_expr.Binary
                                  op_id: Id.Arith_Less
                                  left: <Id.Lit_ArithVarLike pos>
                                  right: {<Id.Lit_Digits 0>}
                                )
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [
                    (C {<_Dbg_errmsg>} {(SQ <'Would be beyond bottom-most (most recent) entry.'>)})
                    (command.ControlFlow
                      token: <Id.ControlFlow_Return return>
                      arg_word: {<1>}
                    )
                  ]
                  spids: [292 307]
                )
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.DParen
                              child: 
                                (arith_expr.Binary
                                  op_id: Id.Arith_GreatEqual
                                  left: <Id.Lit_ArithVarLike pos>
                                  right: 
                                    (arith_expr.Binary
                                      op_id: Id.Arith_Minus
                                      left: <Id.Lit_ArithVarLike _Dbg_stack_size>
                                      right: {<Id.Lit_Digits 1>}
                                    )
                                )
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [
                    (C {<_Dbg_errmsg>} {(SQ <'Would be beyond top-most (least recent) entry.'>)})
                    (command.ControlFlow
                      token: <Id.ControlFlow_Return return>
                      arg_word: {<1>}
                    )
                  ]
                  spids: [323 342]
                )
              ]
            )
            (C {<typeset>} {<-i>} {<adjusted_pos>})
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:adjusted_pos)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (command_sub
                        left_token: <Id.Left_DollarParen '$('>
                        child: (C {<_Dbg_frame_adjusted_pos>} {($ Id.VSub_DollarName '$pos')})
                      )
                    }
                  spids: [368]
                )
              ]
            )
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:_Dbg_stack_pos)
                  op: assign_op.Equal
                  rhs: {($ Id.VSub_DollarName '$pos')}
                  spids: [376]
                )
              ]
            )
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:_Dbg_listline)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (DQ 
                        (braced_var_sub
                          token: <Id.VSub_Name BASH_LINENO>
                          bracket_op: 
                            (bracket_op.ArrayIndex
                              expr: 
                                (arith_expr.Binary
                                  op_id: Id.Arith_Minus
                                  left: <Id.Lit_ArithVarLike adjusted_pos>
                                  right: {<Id.Lit_Digits 1>}
                                )
                            )
                        )
                      )
                    }
                  spids: [402]
                )
              ]
            )
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:_Dbg_frame_last_filename)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (DQ 
                        (braced_var_sub
                          token: <Id.VSub_Name BASH_SOURCE>
                          bracket_op: (bracket_op.ArrayIndex expr:<Id.Lit_ArithVarLike adjusted_pos>)
                        )
                      )
                    }
                  spids: [415]
                )
              ]
            )
            (command.Sentence
              child: (C {<typeset>} {<filename>})
              terminator: <Id.Op_Semi _>
            )
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:filename)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (DQ 
                        (command_sub
                          left_token: <Id.Left_DollarParen '$('>
                          child: 
                            (C {<_Dbg_file_canonic>} 
                              {(DQ ($ Id.VSub_DollarName '$_Dbg_frame_last_filename'))}
                            )
                        )
                      )
                    }
                  spids: [431]
                )
              ]
            )
            (C {<_Dbg_frame_print>} {(SQ <'->'>)} {($ Id.VSub_DollarName '$_Dbg_stack_pos')} {(SQ )} 
              {(DQ ($ Id.VSub_DollarName '$filename'))} {($ Id.VSub_DollarName '$_Dbg_listline')} {(SQ )}
            )
            (C {<_Dbg_print_location_and_command>} {(DQ ($ Id.VSub_DollarName '$_Dbg_listline'))})
            (command.ControlFlow token:<Id.ControlFlow_Return return> arg_word:{<0>})
          ]
        )
    )
    (command.ShFunction
      name: _Dbg_frame_file
      body: 
        (BraceGroup
          children: [
            (command.AndOr
              ops: [Id.Op_DAmp]
              children: [
                (command.DParen
                  child: 
                    (arith_expr.Binary
                      op_id: Id.Arith_Great
                      left: {($ Id.VSub_Pound '$#')}
                      right: {<Id.Lit_Digits 2>}
                    )
                )
                (command.ControlFlow
                  token: <Id.ControlFlow_Return return>
                  arg_word: {<2>}
                )
              ]
            )
            (C {<typeset>} {<-i>} 
              {<Id.Lit_VarLike 'pos='> 
                (braced_var_sub
                  token: <Id.VSub_Number 1>
                  suffix_op: 
                    (suffix_op.Unary
                      tok: <Id.VTest_ColonHyphen ':-'>
                      arg_word: {($ Id.VSub_DollarName '$_Dbg_stack_pos')}
                    )
                )
              }
            )
            (C {<typeset>} {<-i>} 
              {<Id.Lit_VarLike 'basename_only='> 
                (braced_var_sub
                  token: <Id.VSub_Number 2>
                  suffix_op: 
                    (suffix_op.Unary
                      tok: <Id.VTest_ColonHyphen ':-'>
                      arg_word: {($ Id.VSub_DollarName '$_Dbg_set_basename')}
                    )
                )
              }
            )
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:_Dbg_frame_filename)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (braced_var_sub
                        token: <Id.VSub_Name BASH_SOURCE>
                        bracket_op: (bracket_op.ArrayIndex expr:<Id.Lit_ArithVarLike pos>)
                      )
                    }
                  spids: [544]
                )
              ]
            )
            (command.AndOr
              ops: [Id.Op_DAmp]
              children: [
                (command.DParen child:<Id.Lit_ArithVarLike basename_only>)
                (command.ShAssignment
                  pairs: [
                    (assign_pair
                      lhs: (sh_lhs_expr.Name name:_Dbg_frame_filename)
                      op: assign_op.Equal
                      rhs: 
                        {
                          (braced_var_sub
                            token: <Id.VSub_Name _Dbg_frame_filename>
                            suffix_op: 
                              (suffix_op.Unary
                                tok: <Id.VOp1_DPound '##'>
                                arg_word: {<Id.Lit_Other '*'> <Id.Lit_Slash '/'>}
                              )
                          )
                        }
                      spids: [562]
                    )
                  ]
                )
              ]
            )
            (command.ControlFlow token:<Id.ControlFlow_Return return> arg_word:{<0>})
          ]
        )
    )
    (command.ShFunction
      name: _Dbg_frame_int_setup
      body: 
        (BraceGroup
          children: [
            (command.AndOr
              ops: [Id.Op_DAmp]
              children: [
                (C {<_Dbg_not_running>})
                (command.ControlFlow
                  token: <Id.ControlFlow_Return return>
                  arg_word: {<1>}
                )
              ]
            )
            (C {<eval>} {(DQ ($ Id.VSub_DollarName '$_seteglob'))})
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.DBracket
                              expr: 
                                (bool_expr.LogicalAnd
                                  left: 
                                    (bool_expr.Binary
                                      op_id: Id.BoolBinary_GlobNEqual
                                      left: {($ Id.VSub_Number '$1')}
                                      right: {(SQ )}
                                    )
                                  right: 
                                    (bool_expr.Binary
                                      op_id: Id.BoolBinary_GlobNEqual
                                      left: {($ Id.VSub_Number '$1')}
                                      right: {($ Id.VSub_DollarName '$_Dbg_signed_int_pat')}
                                    )
                                )
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [
                    (C {<_Dbg_errmsg>} {(DQ <'Bad integer parameter: '> ($ Id.VSub_Number '$1'))})
                    (C {<eval>} {(DQ ($ Id.VSub_DollarName '$_resteglob'))})
                    (command.ControlFlow
                      token: <Id.ControlFlow_Return return>
                      arg_word: {<1>}
                    )
                  ]
                  spids: [608 631]
                )
              ]
            )
            (C {<eval>} {(DQ ($ Id.VSub_DollarName '$_resteglob'))})
            (command.ControlFlow token:<Id.ControlFlow_Return return> arg_word:{<0>})
          ]
        )
    )
    (command.ShFunction
      name: _Dbg_frame_adjusted_pos
      body: 
        (BraceGroup
          children: [
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.DParen
                              child: 
                                (arith_expr.Binary
                                  op_id: Id.Arith_NEqual
                                  left: {($ Id.VSub_Pound '$#')}
                                  right: {<Id.Lit_Digits 1>}
                                )
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [
                    (C {<echo>} {<-n>} {(SQ <-1>)})
                    (command.ControlFlow
                      token: <Id.ControlFlow_Return return>
                      arg_word: {<1>}
                    )
                  ]
                  spids: [684 697]
                )
              ]
            )
            (C {<typeset>} {<-i>} {<pos>})
            (command.DParen
              child: 
                (arith_expr.BinaryAssign
                  op_id: Id.Arith_Equal
                  left: <Id.Lit_ArithVarLike pos>
                  right: 
                    (arith_expr.Binary
                      op_id: Id.Arith_Plus
                      left: 
                        (arith_expr.Binary
                          op_id: Id.Arith_Minus
                          left: 
                            {
                              (braced_var_sub
                                token: <Id.VSub_Name FUNCNAME>
                                prefix_op: (Id.VSub_Pound)
                                bracket_op: (bracket_op.WholeArray op_id:Id.Lit_At)
                              )
                            }
                          right: <Id.Lit_ArithVarLike _Dbg_stack_size>
                        )
                      right: {($ Id.VSub_Number '$1')}
                    )
                )
            )
            (C {<echo>} {<-n>} {($ Id.VSub_DollarName '$pos')})
            (command.ControlFlow token:<Id.ControlFlow_Return return> arg_word:{<0>})
          ]
        )
    )
    (command.ShFunction
      name: _Dbg_frame_fn_param_str
      body: 
        (BraceGroup
          children: [
            (command.AndOr
              ops: [Id.Op_DPipe]
              children: [
                (command.DParen
                  child: 
                    (arith_expr.Binary
                      op_id: Id.Arith_DEqual
                      left: {($ Id.VSub_Pound '$#')}
                      right: {<Id.Lit_Digits 0>}
                    )
                )
                (command.ControlFlow
                  token: <Id.ControlFlow_Return return>
                  arg_word: {<1>}
                )
              ]
            )
            (command.AndOr
              ops: [Id.Op_DPipe]
              children: [
                (C {<_Dbg_is_int>} {(DQ ($ Id.VSub_DollarName '$_Dbg_next_argc'))})
                (command.ControlFlow
                  token: <Id.ControlFlow_Return return>
                  arg_word: {<2>}
                )
              ]
            )
            (command.AndOr
              ops: [Id.Op_DPipe]
              children: [
                (C {<_Dbg_is_int>} {(DQ ($ Id.VSub_DollarName '$_Dbg_next_argv'))})
                (command.ControlFlow
                  token: <Id.ControlFlow_Return return>
                  arg_word: {<3>}
                )
              ]
            )
            (command.DParen
              child: 
                (arith_expr.UnaryAssign
                  op_id: Id.Node_PostDPlus
                  child: <Id.Lit_ArithVarLike _Dbg_next_argc>
                )
            )
            (C {<typeset>} {<-i>} 
              {<Id.Lit_VarLike 'arg_count='> <Id.Lit_ArrayLhsOpen 'BASH_ARGC['> 
                ($ Id.VSub_DollarName '$_Dbg_next_argc') <Id.Lit_RBracket ']'>
              }
            )
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.DParen
                              child: 
                                (arith_expr.Binary
                                  op_id: Id.Arith_DEqual
                                  left: <Id.Lit_ArithVarLike arg_count>
                                  right: {<Id.Lit_Digits 0>}
                                )
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:_Dbg_parm_str)
                          op: assign_op.Equal
                          rhs: {(SQ )}
                          spids: [877]
                        )
                      ]
                    )
                  ]
                  spids: [861 874]
                )
              ]
              else_action: [
                (C {<typeset>} {<-i>} {<i>})
                (command.ShAssignment
                  pairs: [
                    (assign_pair
                      lhs: (sh_lhs_expr.Name name:_Dbg_parm_str)
                      op: assign_op.Equal
                      rhs: 
                        {
                          (DQ (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>) 
                            (braced_var_sub
                              token: <Id.VSub_Name BASH_ARGV>
                              bracket_op: 
                                (bracket_op.ArrayIndex
                                  expr: 
                                    (arith_expr.Binary
                                      op_id: Id.Arith_Minus
                                      left: 
                                        (arith_expr.Binary
                                          op_id: Id.Arith_Plus
                                          left: {($ Id.VSub_DollarName '$_Dbg_next_argv')}
                                          right: <Id.Lit_ArithVarLike arg_count>
                                        )
                                      right: {<Id.Lit_Digits 1>}
                                    )
                                )
                            ) (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>)
                          )
                        }
                      spids: [892]
                    )
                  ]
                )
                (command.ForExpr
                  init: 
                    (arith_expr.BinaryAssign
                      op_id: Id.Arith_Equal
                      left: <Id.Lit_ArithVarLike i>
                      right: {<Id.Lit_Digits 1>}
                    )
                  cond: 
                    (arith_expr.Binary
                      op_id: Id.Arith_LessEqual
                      left: <Id.Lit_ArithVarLike i>
                      right: 
                        (arith_expr.Binary
                          op_id: Id.Arith_Minus
                          left: <Id.Lit_ArithVarLike arg_count>
                          right: {<Id.Lit_Digits 1>}
                        )
                    )
                  update: 
                    (arith_expr.UnaryAssign
                      op_id: Id.Node_PostDPlus
                      child: <Id.Lit_ArithVarLike i>
                    )
                  body: 
                    (command.DoGroup
                      children: [
                        (command.ShAssignment
                          pairs: [
                            (assign_pair
                              lhs: (sh_lhs_expr.Name name:_Dbg_parm_str)
                              op: assign_op.PlusEqual
                              rhs: 
                                {
                                  (DQ <', '> 
                                    (word_part.EscapedLiteral
                                      token: <Id.Lit_EscapedChar '\\"'>
                                    ) 
                                    (braced_var_sub
                                      token: <Id.VSub_Name BASH_ARGV>
                                      bracket_op: 
                                        (bracket_op.ArrayIndex
                                          expr: 
                                            (arith_expr.Binary
                                              op_id: Id.Arith_Minus
                                              left: 
                                                (arith_expr.Binary
                                                  op_id: Id.Arith_Minus
                                                  left: 
                                                    (arith_expr.Binary
                                                      op_id: Id.Arith_Plus
                                                      left: {($ Id.VSub_DollarName '$_Dbg_next_argv')}
                                                      right: <Id.Lit_ArithVarLike arg_count>
                                                    )
                                                  right: <Id.Lit_ArithVarLike i>
                                                )
                                              right: {<Id.Lit_Digits 1>}
                                            )
                                        )
                                    ) (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>)
                                  )
                                }
                              spids: [938]
                            )
                          ]
                        )
                      ]
                    )
                )
                (command.DParen
                  child: 
                    (arith_expr.BinaryAssign
                      op_id: Id.Arith_PlusEqual
                      left: <Id.Lit_ArithVarLike _Dbg_next_argv>
                      right: <Id.Lit_ArithVarLike arg_count>
                    )
                )
              ]
            )
            (command.ControlFlow token:<Id.ControlFlow_Return return> arg_word:{<0>})
          ]
        )
    )
    (command.ShFunction
      name: _Dbg_frame_set_fn_param
      body: 
        (BraceGroup
          children: [
            (command.AndOr
              ops: [Id.Op_DPipe]
              children: [
                (command.DParen
                  child: 
                    (arith_expr.Binary
                      op_id: Id.Arith_DEqual
                      left: {($ Id.VSub_Pound '$#')}
                      right: {<Id.Lit_Digits 1>}
                    )
                )
                (command.ControlFlow
                  token: <Id.ControlFlow_Return return>
                  arg_word: {<1>}
                )
              ]
            )
            (C {<typeset>} {<-i>} {<Id.Lit_VarLike 'skip_count='> ($ Id.VSub_Number '$1')})
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:_Dbg_next_argc)
                  op: assign_op.Equal
                  rhs: {<1>}
                  spids: [1014]
                )
              ]
            )
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:_Dbg_next_argv)
                  op: assign_op.Equal
                  rhs: {<1>}
                  spids: [1018]
                )
              ]
            )
            (C {<typeset>} {<-i>} {<i>})
            (command.ForExpr
              init: 
                (arith_expr.BinaryAssign
                  op_id: Id.Arith_Equal
                  left: <Id.Lit_ArithVarLike i>
                  right: {<Id.Lit_Digits 1>}
                )
              cond: 
                (arith_expr.Binary
                  op_id: Id.Arith_LessEqual
                  left: <Id.Lit_ArithVarLike i>
                  right: <Id.Lit_ArithVarLike skip_count>
                )
              update: (arith_expr.UnaryAssign op_id:Id.Node_PostDPlus child:<Id.Lit_ArithVarLike i>)
              body: 
                (command.DoGroup
                  children: [
                    (C {<typeset>} {<-i>} 
                      {<Id.Lit_VarLike 'arg_count='> 
                        (braced_var_sub
                          token: <Id.VSub_Name BASH_ARGC>
                          bracket_op: (bracket_op.ArrayIndex expr:{($ Id.VSub_DollarName '$i')})
                        )
                      }
                    )
                    (command.DParen
                      child: 
                        (arith_expr.BinaryAssign
                          op_id: Id.Arith_PlusEqual
                          left: <Id.Lit_ArithVarLike _Dbg_next_argv>
                          right: <Id.Lit_ArithVarLike arg_count>
                        )
                    )
                  ]
                )
            )
            (command.DParen
              child: 
                (arith_expr.BinaryAssign
                  op_id: Id.Arith_Equal
                  left: <Id.Lit_ArithVarLike _Dbg_next_argc>
                  right: <Id.Lit_ArithVarLike skip_count>
                )
            )
            (command.DParen
              child: 
                (arith_expr.UnaryAssign
                  op_id: Id.Node_PostDMinus
                  child: <Id.Lit_ArithVarLike _Dbg_next_argv>
                )
            )
          ]
        )
    )
    (command.ShFunction
      name: _Dbg_frame_prefix
      body: 
        (BraceGroup
          children: [
            (C {<typeset>} {<Id.Lit_VarLike 'prefix='> (SQ <'??'>)})
            (C {<typeset>} {<-i>} {<Id.Lit_VarLike 'rc='> <0>})
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.DParen
                              child: 
                                (arith_expr.Binary
                                  op_id: Id.Arith_DEqual
                                  left: {($ Id.VSub_Pound '$#')}
                                  right: {<Id.Lit_Digits 1>}
                                )
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [
                    (C {<typeset>} {<-i>} {<Id.Lit_VarLike 'pos='> ($ Id.VSub_Number '$1')})
                    (command.If
                      arms: [
                        (if_arm
                          cond: 
                            (condition.Shell
                              commands: [
                                (command.Sentence
                                  child: 
                                    (command.DParen
                                      child: 
                                        (arith_expr.Binary
                                          op_id: Id.Arith_Less
                                          left: <Id.Lit_ArithVarLike pos>
                                          right: {<Id.Lit_Digits 0>}
                                        )
                                    )
                                  terminator: <Id.Op_Semi _>
                                )
                              ]
                            )
                          action: [
                            (command.ShAssignment
                              pairs: [
                                (assign_pair
                                  lhs: (sh_lhs_expr.Name name:rc)
                                  op: assign_op.Equal
                                  rhs: {<2>}
                                  spids: [1206]
                                )
                              ]
                            )
                          ]
                          spids: [1190 1203]
                        )
                        (if_arm
                          cond: 
                            (condition.Shell
                              commands: [
                                (command.Sentence
                                  child: 
                                    (command.DParen
                                      child: 
                                        (arith_expr.Binary
                                          op_id: Id.Arith_GreatEqual
                                          left: <Id.Lit_ArithVarLike pos>
                                          right: <Id.Lit_ArithVarLike _Dbg_stack_size>
                                        )
                                    )
                                  terminator: <Id.Op_Semi _>
                                )
                              ]
                            )
                          action: [
                            (command.ShAssignment
                              pairs: [
                                (assign_pair
                                  lhs: (sh_lhs_expr.Name name:rc)
                                  op: assign_op.Equal
                                  rhs: {<3>}
                                  spids: [1226]
                                )
                              ]
                            )
                          ]
                          spids: [1210 1223]
                        )
                        (if_arm
                          cond: 
                            (condition.Shell
                              commands: [
                                (command.Sentence
                                  child: 
                                    (command.DParen
                                      child: 
                                        (arith_expr.Binary
                                          op_id: Id.Arith_DEqual
                                          left: <Id.Lit_ArithVarLike pos>
                                          right: <Id.Lit_ArithVarLike _Dbg_stack_pos>
                                        )
                                    )
                                  terminator: <Id.Op_Semi _>
                                )
                              ]
                            )
                          action: [
                            (command.ShAssignment
                              pairs: [
                                (assign_pair
                                  lhs: (sh_lhs_expr.Name name:prefix)
                                  op: assign_op.Equal
                                  rhs: {(SQ <'->'>)}
                                  spids: [1248]
                                )
                              ]
                            )
                          ]
                          spids: [1230 1245]
                        )
                      ]
                      else_action: [
                        (command.ShAssignment
                          pairs: [
                            (assign_pair
                              lhs: (sh_lhs_expr.Name name:prefix)
                              op: assign_op.Equal
                              rhs: {(SQ <'##'>)}
                              spids: [1257]
                            )
                          ]
                        )
                      ]
                    )
                  ]
                  spids: [1166 1179]
                )
              ]
              else_action: [
                (command.ShAssignment
                  pairs: [
                    (assign_pair
                      lhs: (sh_lhs_expr.Name name:rc)
                      op: assign_op.Equal
                      rhs: {<1>}
                      spids: [1269]
                    )
                  ]
                )
              ]
            )
            (C {<echo>} {<-n>} {($ Id.VSub_DollarName '$prefix')})
            (command.ControlFlow
              token: <Id.ControlFlow_Return return>
              arg_word: {($ Id.VSub_DollarName '$rc')}
            )
          ]
        )
    )
    (command.ShFunction
      name: _Dbg_frame_print
      body: 
        (BraceGroup
          children: [
            (C {<typeset>} {<Id.Lit_VarLike 'prefix='> ($ Id.VSub_Number '$1')})
            (C {<typeset>} {<-i>} {<Id.Lit_VarLike 'pos='> ($ Id.VSub_Number '$2')})
            (C {<typeset>} {<Id.Lit_VarLike 'fn='> ($ Id.VSub_Number '$3')})
            (C {<typeset>} {<Id.Lit_VarLike 'filename='> (DQ ($ Id.VSub_Number '$4'))})
            (C {<typeset>} {<-i>} {<Id.Lit_VarLike 'line='> ($ Id.VSub_Number '$5')})
            (C {<typeset>} {<Id.Lit_VarLike 'args='> (DQ ($ Id.VSub_Number '$6'))})
            (C {<typeset>} {<Id.Lit_VarLike 'callstr='> ($ Id.VSub_DollarName '$fn')})
            (command.AndOr
              ops: [Id.Op_DAmp]
              children: [
                (command.DBracket
                  expr: (bool_expr.Unary op_id:Id.BoolUnary_n child:{($ Id.VSub_DollarName '$args')})
                )
                (command.ShAssignment
                  pairs: [
                    (assign_pair
                      lhs: (sh_lhs_expr.Name name:callstr)
                      op: assign_op.Equal
                      rhs: 
                        {
                          (DQ ($ Id.VSub_DollarName '$callstr') <'('> ($ Id.VSub_DollarName '$args') 
                            <')'>
                          )
                        }
                      spids: [1360]
                    )
                  ]
                )
              ]
            )
            (C {<_Dbg_msg>} 
              {
                (DQ ($ Id.VSub_DollarName '$prefix') ($ Id.VSub_DollarName '$pos') <' in file '> 
                  (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\`'>) ($ Id.VSub_DollarName '$filename') <'\' at line '> ($ Id.VSub_DollarName '$line')
                )
              }
            )
          ]
        )
    )
  ]
)