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    (command.If
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        (if_arm
          cond: 
            (condition.Shell
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                (command.Sentence
                  child: 
                    (command.DBracket
                      expr: 
                        (bool_expr.Binary
                          op_id: Id.BoolBinary_GlobDEqual
                          left: {($ Id.VSub_Number '$0')}
                          right: 
                            {
                              (braced_var_sub
                                token: <Id.VSub_Name BASH_SOURCE>
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                              )
                            }
                        )
                    )
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:dirname)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (braced_var_sub
                        token: <Id.VSub_Name BASH_SOURCE>
                        bracket_op: (bracket_op.ArrayIndex expr:{<Id.Lit_Digits 0>})
                        suffix_op: 
                          (suffix_op.Unary
                            tok: <Id.VOp1_Percent '%'>
                            arg_word: {<Id.Lit_Slash '/'> <Id.Lit_Other '*'>}
                          )
                      )
                    }
                  spids: [77]
                )
              ]
            )
            (command.AndOr
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              children: [
                (command.DBracket
                  expr: 
                    (bool_expr.Binary
                      op_id: Id.BoolBinary_GlobDEqual
                      left: {($ Id.VSub_DollarName '$dirname')}
                      right: {($ Id.VSub_Number '$0')}
                    )
                )
                (command.ShAssignment
                  pairs: [
                    (assign_pair
                      lhs: (sh_lhs_expr.Name name:top_dir)
                      op: assign_op.Equal
                      rhs: {(SQ <..>)}
                      spids: [101]
                    )
                  ]
                )
                (command.ShAssignment
                  pairs: [
                    (assign_pair
                      lhs: (sh_lhs_expr.Name name:top_dir)
                      op: assign_op.Equal
                      rhs: {(${ Id.VSub_Name dirname) <'/..'>}
                      spids: [108]
                    )
                  ]
                )
              ]
            )
            (command.ForEach
              iter_name: lib_file
              iter_words: [{<help>} {<alias>}]
              do_arg_iter: F
              body: 
                (command.DoGroup
                  children: [
                    (command.Sentence
                      child: 
                        (C {<source>} 
                          {($ Id.VSub_DollarName '$top_dir') <'/lib/'> (${ Id.VSub_Name lib_file) <.sh>}
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                )
            )
          ]
          spids: [55 74]
        )
      ]
    )
    (C {<_Dbg_help_add>} {<complete>} 
      {
        (SQ <'**complete** *prefix-str*...\n'> <'\n'> <'\n'> 
          <'Show command completion strings for *prefix-str*\n'>
        )
      }
    )
    (command.ShFunction
      name: _Dbg_do_complete
      body: 
        (BraceGroup
          children: [
            (command.Sentence
              child: (C {<typeset>} {<-a>} {<args>})
              terminator: <Id.Op_Semi _>
            )
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:args)
                  op: assign_op.Equal
                  rhs: {(sh_array_literal left:<Id.Op_LParen _> words:[{($ Id.VSub_At '$@')}])}
                  spids: [171]
                )
              ]
            )
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:_Dbg_matches)
                  op: assign_op.Equal
                  rhs: {(sh_array_literal left:<Id.Op_LParen _>)}
                  spids: [177]
                )
              ]
            )
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.DParen
                              child: 
                                (arith_expr.Binary
                                  op_id: Id.Arith_DEqual
                                  left: 
                                    {
                                      (braced_var_sub
                                        token: <Id.VSub_Name args>
                                        prefix_op: (Id.VSub_Pound)
                                        bracket_op: (bracket_op.WholeArray op_id:Id.Lit_At)
                                      )
                                    }
                                  right: {<Id.Lit_Digits 2>}
                                )
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [
                    (C {<_Dbg_subcmd_complete>} 
                      {
                        (braced_var_sub
                          token: <Id.VSub_Name args>
                          bracket_op: (bracket_op.ArrayIndex expr:{<Id.Lit_Digits 0>})
                        )
                      } {(braced_var_sub token:<Id.VSub_Name args> bracket_op:(bracket_op.ArrayIndex expr:{<Id.Lit_Digits 1>}))}
                    )
                  ]
                  spids: [182 203]
                )
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (command.DParen
                              child: 
                                (arith_expr.Binary
                                  op_id: Id.Arith_DEqual
                                  left: 
                                    {
                                      (braced_var_sub
                                        token: <Id.VSub_Name args>
                                        prefix_op: (Id.VSub_Pound)
                                        bracket_op: (bracket_op.WholeArray op_id:Id.Lit_At)
                                      )
                                    }
                                  right: {<Id.Lit_Digits 1>}
                                )
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [
                    (C {<eval>} 
                      {
                        (DQ <'builtin compgen -W '> 
                          (word_part.EscapedLiteral
                            token: <Id.Lit_EscapedChar '\\"'>
                          ) 
                          (braced_var_sub
                            token: <Id.VSub_Name _Dbg_debugger_commands>
                            prefix_op: (Id.VSub_Bang)
                            bracket_op: (bracket_op.WholeArray op_id:Id.Lit_At)
                          ) (word_part.EscapedLiteral token:<Id.Lit_EscapedChar '\\"'>) <' -- '> 
                          (braced_var_sub
                            token: <Id.VSub_Name args>
                            bracket_op: (bracket_op.ArrayIndex expr:{<Id.Lit_Digits 0>})
                          )
                        )
                      }
                    )
                  ]
                  spids: [223 244]
                )
              ]
            )
            (C {<typeset>} {<-i>} {<i>})
            (command.ForExpr
              init: 
                (arith_expr.BinaryAssign
                  op_id: Id.Arith_Equal
                  left: <Id.Lit_ArithVarLike i>
                  right: {<Id.Lit_Digits 0>}
                )
              cond: 
                (arith_expr.Binary
                  op_id: Id.Arith_Less
                  left: <Id.Lit_ArithVarLike i>
                  right: 
                    {
                      (braced_var_sub
                        token: <Id.VSub_Name _Dbg_matches>
                        prefix_op: (Id.VSub_Pound)
                        bracket_op: (bracket_op.WholeArray op_id:Id.Lit_At)
                      )
                    }
                )
              update: (arith_expr.UnaryAssign op_id:Id.Node_PostDPlus child:<Id.Lit_ArithVarLike i>)
              body: 
                (command.DoGroup
                  children: [
                    (C {<_Dbg_msg>} 
                      {
                        (braced_var_sub
                          token: <Id.VSub_Name _Dbg_matches>
                          bracket_op: (bracket_op.ArrayIndex expr:{($ Id.VSub_DollarName '$i')})
                        )
                      }
                    )
                  ]
                )
            )
          ]
        )
    )
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: 
                    (command.DBracket
                      expr: 
                        (bool_expr.Binary
                          op_id: Id.BoolBinary_GlobDEqual
                          left: {($ Id.VSub_Number '$0')}
                          right: 
                            {
                              (braced_var_sub
                                token: <Id.VSub_Name BASH_SOURCE>
                                bracket_op: (bracket_op.ArrayIndex expr:{<Id.Lit_Digits 0>})
                              )
                            }
                        )
                    )
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (C {<source>} {(${ Id.VSub_Name top_dir) <'/lib/msg.sh'>})
            (command.ForEach
              iter_name: _Dbg_file
              iter_words: [
                (word.BracedTree
                  parts: [
                    (${ Id.VSub_Name top_dir)
                    <'/command/'>
                    (word_part.BracedTuple
                      words: [{<c> <Id.Lit_Star '*'>} {<help>}]
                    )
                    <.sh>
                  ]
                )
              ]
              do_arg_iter: F
              body: (command.DoGroup children:[(C {<source>} {($ Id.VSub_DollarName '$_Dbg_file')})])
            )
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:_Dbg_args)
                  op: assign_op.Equal
                  rhs: {(SQ <complete>)}
                  spids: [398]
                )
              ]
            )
            (C {<_Dbg_do_help>} {<complete>})
            (C {<_Dbg_do_complete>} {<c>})
          ]
          spids: [336 355]
        )
      ]
    )
  ]
)