(command.CommandList
  children: [
    (command.Simple
      blame_tok: <_Dbg_help_add>
      more_env: []
      words: [
        {<_Dbg_help_add>}
        {<untrace>}
        {
          (SQ <'untrace FUNCTION\n'> <'\n'> 
            <'Untrace previously-traced function FUNCTION. See also "trace".'>
          )
        }
      ]
      redirects: []
      do_fork: T
    )
    (command.ShFunction
      keyword: <Id.KW_Function function>
      name_tok: <_Dbg_do_untrace>
      name: _Dbg_do_untrace
      body: 
        (BraceGroup
          left: <Id.Lit_LBrace '{'>
          children: [
            (command.Simple
              blame_tok: <typeset>
              more_env: []
              words: [{<typeset>} {<Id.Lit_VarLike 'fn='> ($ Id.VSub_Number 1)}]
              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.Unary
                                  op_id: Id.BoolUnary_z
                                  child: {($ Id.VSub_DollarName fn)}
                                )
                              right: <Id.Lit_DRightBracket ']]'>
                              redirects: []
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  then_kw: <Id.KW_Then then>
                  action: [
                    (command.Simple
                      blame_tok: <_Dbg_errmsg>
                      more_env: []
                      words: [{<_Dbg_errmsg>} {(DQ <'untrace: missing or invalid function name.'>)}]
                      redirects: []
                      do_fork: T
                    )
                    (command.ControlFlow
                      keyword: <Id.ControlFlow_Return return>
                      arg_word: {<2>}
                    )
                  ]
                  spids: [86 98]
                )
              ]
              else_action: []
              fi_kw: <Id.KW_Fi fi>
              redirects: []
            )
            (command.AndOr
              children: [
                (command.Simple
                  blame_tok: <_Dbg_is_function>
                  more_env: []
                  words: [
                    {<_Dbg_is_function>}
                    {(DQ ($ Id.VSub_DollarName fn))}
                    {($ Id.VSub_DollarName _Dbg_set_debug)}
                  ]
                  redirects: []
                  do_fork: T
                )
                (BraceGroup
                  left: <Id.Lit_LBrace '{'>
                  children: [
                    (command.Simple
                      blame_tok: <_Dbg_errmsg>
                      more_env: []
                      words: [
                        {<_Dbg_errmsg>}
                        {
                          (DQ <'untrace: function '> 
                            (word_part.EscapedLiteral
                              token: <Id.Lit_EscapedChar '\\"'>
                              ch: '"'
                            ) ($ Id.VSub_DollarName fn) (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'> ch:'"') 
                            <' is not a function.'>
                          )
                        }
                      ]
                      redirects: []
                      do_fork: T
                    )
                    (command.ControlFlow
                      keyword: <Id.ControlFlow_Return return>
                      arg_word: {<3>}
                    )
                  ]
                  redirects: []
                  right: <Id.Lit_RBrace '}'>
                )
              ]
              ops: [<Id.Op_DPipe _>]
            )
            (command.AndOr
              children: [
                (command.Simple
                  blame_tok: <_Dbg_is_function>
                  more_env: []
                  words: [{<_Dbg_is_function>} {(DQ <old_> ($ Id.VSub_DollarName fn))}]
                  redirects: []
                  do_fork: T
                )
                (BraceGroup
                  left: <Id.Lit_LBrace '{'>
                  children: [
                    (command.Simple
                      blame_tok: <_Dbg_errmsg>
                      more_env: []
                      words: [
                        {<_Dbg_errmsg>}
                        {
                          (DQ <'untrace: old function old_'> ($ Id.VSub_DollarName fn) 
                            <' not seen - nothing done.'>
                          )
                        }
                      ]
                      redirects: []
                      do_fork: T
                    )
                    (command.ControlFlow
                      keyword: <Id.ControlFlow_Return return>
                      arg_word: {<4>}
                    )
                  ]
                  redirects: []
                  right: <Id.Lit_RBrace '}'>
                )
              ]
              ops: [<Id.Op_DPipe _>]
            )
            (command.If
              if_kw: <Id.KW_If if>
              arms: [
                (IfArm
                  keyword: <Id.KW_If if>
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.ShAssignment
                              left: <Id.Lit_VarLike 'cmd='>
                              pairs: [
                                (AssignPair
                                  left: <Id.Lit_VarLike 'cmd='>
                                  lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'cmd='> name:cmd)
                                  op: assign_op.Equal
                                  rhs: 
                                    {
                                      (CommandSub
                                        left_token: <Id.Left_DollarParen '$('>
                                        child: 
                                          (command.Simple
                                            blame_tok: <declare>
                                            more_env: []
                                            words: [
                                              {<declare>}
                                              {<-f>}
                                              {<-->}
                                              {(DQ <old_> ($ Id.VSub_DollarName fn))}
                                            ]
                                            redirects: []
                                            do_fork: T
                                          )
                                        right: <Id.Eof_RParen _>
                                      )
                                    }
                                )
                              ]
                              redirects: []
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  then_kw: <Id.KW_Then then>
                  action: [
                    (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_EqualTilde
                                          left: {($ Id.VSub_DollarName cmd)}
                                          right: {(SQ <'^function old_'>)}
                                        )
                                      right: <Id.Lit_DRightBracket ']]'>
                                      redirects: []
                                    )
                                  terminator: <Id.Op_Semi _>
                                )
                              ]
                            )
                          then_kw: <Id.KW_Then then>
                          action: [
                            (command.ShAssignment
                              left: <Id.Lit_VarLike 'cmd='>
                              pairs: [
                                (AssignPair
                                  left: <Id.Lit_VarLike 'cmd='>
                                  lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'cmd='> name:cmd)
                                  op: assign_op.Equal
                                  rhs: 
                                    {
                                      (DQ <'function '> 
                                        (BracedVarSub
                                          left: <Id.Left_DollarBrace '${'>
                                          token: <Id.VSub_Name cmd>
                                          var_name: cmd
                                          suffix_op: (suffix_op.Slice begin:{<Id.Lit_Digits 13>})
                                          right: <Id.Arith_RBrace _>
                                        )
                                      )
                                    }
                                )
                              ]
                              redirects: []
                            )
                          ]
                          spids: [199 215]
                        )
                      ]
                      else_kw: <Id.KW_Else else>
                      else_action: [
                        (command.ShAssignment
                          left: <Id.Lit_VarLike 'cmd='>
                          pairs: [
                            (AssignPair
                              left: <Id.Lit_VarLike 'cmd='>
                              lhs: (sh_lhs_expr.Name left:<Id.Lit_VarLike 'cmd='> name:cmd)
                              op: assign_op.Equal
                              rhs: 
                                {
                                  (BracedVarSub
                                    left: <Id.Left_DollarBrace '${'>
                                    token: <Id.VSub_Name cmd>
                                    var_name: cmd
                                    suffix_op: 
                                      (suffix_op.Unary
                                        op: <Id.VOp1_Pound '#'>
                                        arg_word: {<old_>}
                                      )
                                    right: <Id.Right_DollarBrace '}'>
                                  )
                                }
                            )
                          ]
                          redirects: []
                        )
                      ]
                      fi_kw: <Id.KW_Fi fi>
                      redirects: []
                    )
                    (command.AndOr
                      children: [
                        (command.DParen
                          left: <Id.Op_DLeftParen _>
                          child: ($ Id.Lit_ArithVarLike _Dbg_debug_debugger)
                          right: <Id.Op_DRightParen _>
                          redirects: []
                        )
                        (command.Simple
                          blame_tok: <echo>
                          more_env: []
                          words: [{<echo>} {($ Id.VSub_DollarName cmd)}]
                          redirects: []
                          do_fork: T
                        )
                      ]
                      ops: [<Id.Op_DAmp _>]
                    )
                    (command.AndOr
                      children: [
                        (command.Simple
                          blame_tok: <eval>
                          more_env: []
                          words: [{<eval>} {(DQ ($ Id.VSub_DollarName cmd))}]
                          redirects: []
                          do_fork: T
                        )
                        (command.ControlFlow
                          keyword: <Id.ControlFlow_Return return>
                          arg_word: {<6>}
                        )
                      ]
                      ops: [<Id.Op_DPipe _>]
                    )
                    (command.Simple
                      blame_tok: <_Dbg_msg>
                      more_env: []
                      words: [
                        {<_Dbg_msg>}
                        {
                          (DQ (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'> ch:'"') 
                            ($ Id.VSub_DollarName fn) (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'> ch:'"') <' restored from '> 
                            (word_part.EscapedLiteral
                              token: <Id.Lit_EscapedChar '\\"'>
                              ch: '"'
                            ) <old_> (${ Id.VSub_Name fn) (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'> ch:'"') <.>
                          )
                        }
                      ]
                      redirects: []
                      do_fork: T
                    )
                    (command.ControlFlow
                      keyword: <Id.ControlFlow_Return return>
                      arg_word: {<0>}
                    )
                  ]
                  spids: [177 195]
                )
              ]
              else_kw: <Id.KW_Else else>
              else_action: [
                (command.Simple
                  blame_tok: <_Dbg_errmsg>
                  more_env: []
                  words: [
                    {<_Dbg_errmsg>}
                    {
                      (DQ <'Can\'t find function definition for '> 
                        (word_part.EscapedLiteral
                          token: <Id.Lit_EscapedChar '\\"'>
                          ch: '"'
                        ) ($ Id.VSub_DollarName fn) (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'> ch:'"') <.>
                      )
                    }
                  ]
                  redirects: []
                  do_fork: T
                )
                (command.ControlFlow
                  keyword: <Id.ControlFlow_Return return>
                  arg_word: {<5>}
                )
              ]
              fi_kw: <Id.KW_Fi fi>
              redirects: []
            )
          ]
          redirects: []
          right: <Id.Lit_RBrace '}'>
        )
    )
  ]
)