(CommandList
  children: [
    (C {(_Dbg_help_add)} {(trace)} 
      {
        (SQ <"**trace** *function*\n"> <"\n"> <"trace alias *alias*\n"> <"\n"> 
          <"Set \"xtrace\" (set -x) tracing when *function is called.\n"> <"\n"> <"See also \"untrace\" and \"debug\".">
        )
      }
    )
    (FuncDef
      name: _Dbg_do_trace
      body: 
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          children: [
            (If
              arms: [
                (if_arm
                  cond: [
                    (Sentence
                      child: 
                        (DParen
                          child: 
                            (ArithBinary
                              op_id: Arith_DEqual
                              left: (ArithWord w:{($ VSub_Pound "$#")})
                              right: (ArithWord w:{(Lit_Digits 0)})
                            )
                        )
                      terminator: <Op_Semi ";">
                    )
                  ]
                  action: [
                    (C {(_Dbg_errmsg)} {(DQ ("trace: missing function name."))})
                    (ControlFlow token:<ControlFlow_Return return> arg_word:{(2)})
                  ]
                  spids: [-1 109]
                )
              ]
              spids: [-1 124]
            )
            (C {(typeset)} {(-r)} {(Lit_VarLike "fn=") ($ VSub_Number "$1")})
            (C {(typeset)} {(-ri)} 
              {(Lit_VarLike "clear_debug_trap=") 
                (BracedVarSub
                  token: <VSub_Number 2>
                  suffix_op: (StringUnary op_id:VTest_ColonHyphen arg_word:{(1)})
                  spids: [140 144]
                )
              }
            )
            (AndOr
              children: [
                (C {(_Dbg_is_function)} {(DQ ($ VSub_Name "$fn"))} {($ VSub_Name "$_Dbg_set_debug")})
                (BraceGroup
                  children: [
                    (C {(_Dbg_errmsg)} 
                      {
                        (DQ ("trace: function ") (EscapedLiteralPart token:<Lit_EscapedChar "\\\"">) 
                          ($ VSub_Name "$fn") (EscapedLiteralPart token:<Lit_EscapedChar "\\\"">) (" is not a function.")
                        )
                      }
                    )
                    (ControlFlow token:<ControlFlow_Return return> arg_word:{(3)})
                  ]
                  spids: [157]
                )
              ]
              op_id: Op_DPipe
            )
            (AndOr
              children: [
                (Assignment
                  keyword: Assign_None
                  pairs: [
                    (assign_pair
                      lhs: (LhsName name:cmd)
                      op: Equal
                      rhs: 
                        {
                          (CommandSubPart
                            command_list: 
                              (CommandList
                                children: [(C {(typeset)} {(-f)} {(--)} {(DQ ($ VSub_Name "$fn"))})]
                              )
                            left_token: <Left_CommandSub "$(">
                            spids: [180 190]
                          )
                        }
                      spids: [179]
                    )
                  ]
                  spids: [179]
                )
                (BraceGroup
                  children: [
                    (C {(_Dbg_errmsg)} 
                      {
                        (DQ ("Can't find function definition for definition ") 
                          (EscapedLiteralPart
                            token: <Lit_EscapedChar "\\\"">
                          ) ($ VSub_Name "$fn") (EscapedLiteralPart token:<Lit_EscapedChar "\\\"">) (.)
                        )
                      }
                    )
                    (ControlFlow token:<ControlFlow_Return return> arg_word:{(4)})
                  ]
                  spids: [194]
                )
              ]
              op_id: Op_DPipe
            )
            (If
              arms: [
                (if_arm
                  cond: [
                    (Sentence
                      child: 
                        (DBracket
                          expr: 
                            (BoolBinary
                              op_id: BoolBinary_EqualTilde
                              left: {($ VSub_Name "$cmd")}
                              right: {(SQ <"^function ">)}
                            )
                        )
                      terminator: <Op_Semi ";">
                    )
                  ]
                  action: [
                    (Assignment
                      keyword: Assign_None
                      pairs: [
                        (assign_pair
                          lhs: (LhsName name:cmd)
                          op: Equal
                          rhs: 
                            {
                              (DQ ("function old_") 
                                (BracedVarSub
                                  token: <VSub_Name cmd>
                                  suffix_op: (Slice begin:(ArithWord w:{(Lit_Digits 9)}))
                                  spids: [238 242]
                                )
                              )
                            }
                          spids: [235]
                        )
                      ]
                      spids: [235]
                    )
                  ]
                  spids: [-1 232]
                )
              ]
              else_action: [
                (Assignment
                  keyword: Assign_None
                  pairs: [
                    (assign_pair
                      lhs: (LhsName name:cmd)
                      op: Equal
                      rhs: {(DQ (old_) (${ VSub_Name cmd))}
                      spids: [249]
                    )
                  ]
                  spids: [249]
                )
              ]
              spids: [246 258]
            )
            (AndOr
              children: [
                (DParen child:(ArithVarRef name:_Dbg_set_debug))
                (C {(echo)} {(DQ ($ VSub_Name "$cmd"))})
              ]
              op_id: Op_DAmp
            )
            (C {(typeset)} {(Lit_VarLike "save_clear_debug_trap_cmd=") (SQ )})
            (C {(typeset)} {(Lit_VarLike "restore_trap_cmd=") (SQ )})
            (If
              arms: [
                (if_arm
                  cond: [
                    (Sentence
                      child: (DParen child:(ArithVarRef name:clear_debug_trap))
                      terminator: <Op_Semi ";">
                    )
                  ]
                  action: [
                    (Assignment
                      keyword: Assign_None
                      pairs: [
                        (assign_pair
                          lhs: (LhsName name:save_clear_trap_cmd)
                          op: Equal
                          rhs: {(SQ <"local old_handler=$(trap -p DEBUG); trap - DEBUG">)}
                          spids: [303]
                        )
                      ]
                      spids: [303]
                    )
                    (Assignment
                      keyword: Assign_None
                      pairs: [
                        (assign_pair
                          lhs: (LhsName name:restore_trap_cmd)
                          op: Equal
                          rhs: {(SQ <"eval $old_handler">)}
                          spids: [309]
                        )
                      ]
                      spids: [309]
                    )
                  ]
                  spids: [-1 300]
                )
              ]
              spids: [-1 315]
            )
            (AndOr
              children: [
                (C {(eval)} {(DQ ($ VSub_Name "$cmd"))})
                (BraceGroup
                  children: [
                    (C {(_Dbg_errmsg)} 
                      {
                        (DQ ("Error in renaming function ") 
                          (EscapedLiteralPart
                            token: <Lit_EscapedChar "\\\"">
                          ) ($ VSub_Name "$fn") (EscapedLiteralPart token:<Lit_EscapedChar "\\\"">) (" to ") 
                          (EscapedLiteralPart
                            token: <Lit_EscapedChar "\\\"">
                          ) (old_) (${ VSub_Name fn) (EscapedLiteralPart token:<Lit_EscapedChar "\\\"">) (.)
                        )
                      }
                    )
                    (ControlFlow token:<ControlFlow_Return return> arg_word:{(5)})
                  ]
                  spids: [326]
                )
              ]
              op_id: Op_DPipe
            )
            (Assignment
              keyword: Assign_None
              pairs: [
                (assign_pair
                  lhs: (LhsName name:cmd)
                  op: Equal
                  rhs: 
                    {
                      (DQ (${ VSub_Name fn) ("() {\n") ("    ") ($ VSub_Name "$save_clear_trap_cmd") 
                        ("\n") ("    typeset -ri old_set_x=is_traced\n") ("    set -x\n") ("    old_") ($ VSub_Name "$fn") (" ") 
                        (EscapedLiteralPart token:<Lit_EscapedChar "\\\"">) (EscapedLiteralPart token:<Lit_EscapedChar "\\$">) ("@") 
                        (EscapedLiteralPart token:<Lit_EscapedChar "\\\"">) ("\n") ("    typeset -ri rc=") (EscapedLiteralPart token:<Lit_EscapedChar "\\$">) ("?\n") 
                        (
"    (( old_set_x == 0 )) && set +x # still messes up of fn did: set -x\n"
                        ) ("    ") ($ VSub_Name "$restore_trap_cmd") ("\n") ("    return ") 
                        (EscapedLiteralPart token:<Lit_EscapedChar "\\$">) ("rc\n") ("    }\n")
                      )
                    }
                  spids: [355]
                )
              ]
              spids: [355]
            )
            (AndOr
              children: [
                (DParen child:(ArithVarRef name:_Dbg_set_debug))
                (C {(echo)} {(DQ ($ VSub_Name "$cmd"))})
              ]
              op_id: Op_DAmp
            )
            (AndOr
              children: [
                (C {(eval)} {(DQ ($ VSub_Name "$cmd"))})
                (ControlFlow token:<ControlFlow_Return return> arg_word:{(6)})
              ]
              op_id: Op_DPipe
            )
            (C {(_Dbg_msg)} 
              {
                (DQ (EscapedLiteralPart token:<Lit_EscapedChar "\\\"">) ($ VSub_Name "$fn") 
                  (EscapedLiteralPart token:<Lit_EscapedChar "\\\"">) (" renamed ") (EscapedLiteralPart token:<Lit_EscapedChar "\\\"">) (old_) (${ VSub_Name fn) 
                  (EscapedLiteralPart token:<Lit_EscapedChar "\\\"">) (" and traced by ") (EscapedLiteralPart token:<Lit_EscapedChar "\\\"">) (${ VSub_Name fn) 
                  (EscapedLiteralPart token:<Lit_EscapedChar "\\\"">) (.)
                )
              }
            )
            (ControlFlow token:<ControlFlow_Return return> arg_word:{(0)})
          ]
          spids: [93]
        )
      spids: [89 92]
    )
  ]
)