(command.CommandList children: [ (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_f child: {($ Id.VSub_DollarName _Dbg_libdir) <'/builtin/set0'>} ) right: <Id.Lit_DRightBracket ']]'> redirects: [] ) terminator: <Id.Op_Semi _> ) ] ) then_kw: <Id.KW_Then then> action: [ (command.Simple blame_tok: <enable> more_env: [] words: [{<enable>} {<-f>} {($ Id.VSub_DollarName _Dbg_libdir) <'/builtin/set0'>} {<set0>}] redirects: [] do_fork: T ) ] spids: [61 74] ) ] else_action: [] fi_kw: <Id.KW_Fi fi> redirects: [] ) (command.If if_kw: <Id.KW_If if> arms: [ (IfArm keyword: <Id.KW_If if> cond: (condition.Shell commands: [ (command.Sentence child: (command.Simple blame_tok: <enable> more_env: [] words: [{<enable>} {<-a>} {<set0>}] redirects: [ (Redir op: <Id.Redir_Great '2>'> loc: (redir_loc.Fd fd:2) arg: {<'/dev/null'>} ) ] do_fork: T ) terminator: <Id.Op_Semi _> ) ] ) then_kw: <Id.KW_Then then> action: [ (command.Simple blame_tok: <_Dbg_help_add_sub> more_env: [] words: [ {<_Dbg_help_add_sub>} {<set>} {<dollar0>} {(SQ <'set dollar0 PROGRAM_NAME\n'> <'\n'> <'Set $0 to PROGRAM_NAME.'>)} {<1>} ] redirects: [] do_fork: T ) (command.ShFunction name_tok: <_Dbg_do_set_dollar0> name: _Dbg_do_set_dollar0 body: (BraceGroup left: <Id.Lit_LBrace '{'> children: [ (command.If if_kw: <Id.KW_If if> arms: [ (IfArm keyword: <Id.KW_If if> cond: (condition.Shell commands: [ (command.Sentence child: (command.Simple blame_tok: <enable> more_env: [] words: [{<enable>} {<-a>} {<set0>}] redirects: [ (Redir op: <Id.Redir_Great '2>'> loc: (redir_loc.Fd fd:2) arg: {<'/dev/null'>} ) ] do_fork: T ) terminator: <Id.Op_Semi _> ) ] ) then_kw: <Id.KW_Then then> action: [ (command.Simple blame_tok: <set0> more_env: [] words: [{<set0>} {(DQ ($ Id.VSub_Number 1))}] redirects: [] do_fork: T ) ] spids: [142 155] ) ] else_kw: <Id.KW_Else else> else_action: [ (command.Simple blame_tok: <_Dbg_errmsg> more_env: [] words: [ {<_Dbg_errmsg>} {(DQ <'Can\'t do becasue set0 module is not loaded.'>)} ] redirects: [] do_fork: T ) ] fi_kw: <Id.KW_Fi fi> redirects: [] ) (command.ControlFlow keyword: <Id.ControlFlow_Return return> arg_word: {<0>} ) ] redirects: [] right: <Id.Lit_RBrace '}'> ) ) ] spids: [92 105] ) ] else_action: [] fi_kw: <Id.KW_Fi fi> redirects: [] ) ] )