From: "phasis68 (Heesob Park)" <phasis@...>
Date: 2012-12-26T12:12:08+09:00
Subject: [ruby-dev:46805] [ruby-trunk - Bug #6301] irb 起動後に conf.debug_level を変更するとエラーになる


Issue #6301 has been updated by phasis68 (Heesob Park).


After the changeset r38611, the output of irb is too verbose by default.

C:\Users\phasis>irb
<SLex: @head = #<IRB::SLex::Node:0x00000002ea62b0 @Tree={"\0"=>#<IRB::SLex::Node:0x00000002ea5e50 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002ea6120@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:343>>, "\u0004"=>#<IRB::SLex::Node:0x00000002ea5928 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002ea6120@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:343>>, "\u001A"=>#<IRB::SLex::Node:0x00000002ea5540 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002ea6120@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:343>>, " "=>#<IRB::SLex::Node:0x00000002ea4e38 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002ea51d0@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:347>>, "\t"=>#<IRB::SLex::Node:0x00000002ea4b68 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002ea51d0@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:347>>, "\f"=>#<IRB::SLex::Node:0x00000002ea4668 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002ea51d0@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:347>>, "\r"=>#<IRB::SLex::Node:0x00000002ea4078 @Tree={}, @preproc=ni
 l, @postproc=#<Proc:0x00000002ea51d0@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:347>>, "\v"=>#<IRB::SLex::Node:0x00000002e9feb0 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002ea51d0@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:347>>, "#"=>#<IRB::SLex::Node:0x00000002e9fbe0 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e9fdc0@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:354>>, "="=>#<IRB::SLex::Node:0x00000002e9f618 @Tree={"b"=>#<IRB::SLex::Node:0x00000002e9f5a0 @Tree={"e"=>#<IRB::SLex::Node:0x00000002e9f550 @Tree={"g"=>#<IRB::SLex::Node:0x00000002e9f460 @Tree={"i"=>#<IRB::SLex::Node:0x00000002e9f410 @Tree={"n"=>#<IRB::SLex::Node:0x00000002e9f3c0 @Tree={}, @preproc=#<Proc:0x00000002e9fb40@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:359>, @postproc=#<Proc:0x00000002e9fb18@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:359>>}, @preproc=nil, @postproc=nil>}, @preproc=nil, @postproc=nil>}, @preproc=nil, @postproc=nil>}, @preproc=nil, @postproc=nil>, "="=>#<IRB::SLex::Node:0x00000002e9d9a8 @Tree={"="=>#<I
 RB::SLex::Node:0x00000002e9d660 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>, "~"=>#<IRB::SLex::Node:0x00000002e9d1b0 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>, "\n"=>#<IRB::SLex::Node:0x00000002e9ecb8 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e9efd8@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:371>>, "*"=>#<IRB::SLex::Node:0x00000002e9e4c0 @Tree={"*"=>#<IRB::SLex::Node:0x00000002e9e010 @Tree={"="=>#<IRB::SLex::Node:0x00000002e8d4e0 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e8e110@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:471>>}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>, "="=>#<IRB::SLex::Node:0x00000002e8d850 @Tree={}
 , @preproc=nil, @postproc=#<Proc:0x00000002e8e110@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:471>>}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>, "<"=>#<IRB::SLex::Node:0x00000002e9cc38 @Tree={"="=>#<IRB::SLex::Node:0x00000002e9cb98 @Tree={">"=>#<IRB::SLex::Node:0x00000002e9cb20 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>, "<"=>#<IRB::SLex::Node:0x00000002e94790 @Tree={"="=>#<IRB::SLex::Node:0x00000002e86f28 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e8e110@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:471>>}, @preproc=nil, @postproc=#<Proc:0x00000002e949e8@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:406>>}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>, ">"=>#<IRB::SLex::Node:0x00000002e96158 @Tree={"="=>#<IRB::SLex::Node:0x00000002e95820 @Tre
 e={}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>, ">"=>#<IRB::SLex::Node:0x00000002e955a0 @Tree={"="=>#<IRB::SLex::Node:0x00000002e869d8 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e8e110@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:471>>}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>, "!"=>#<IRB::SLex::Node:0x00000002e95230 @Tree={"="=>#<IRB::SLex::Node:0x00000002e94ec0 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>, "~"=>#<IRB::SLex::Node:0x00000002e94b00 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>, "'"=>#<IRB::SLex::Node:0x00000002e94268 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00
 000002e94650@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:428>>, "\""=>#<IRB::SLex::Node:0x00000002e8ed18 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e94650@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:428>>, "`"=>#<IRB::SLex::Node:0x00000002e8fc68 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e8ff10@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:433>>, "?"=>#<IRB::SLex::Node:0x00000002e8f8d0 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e8fb00@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:443>>, "&"=>#<IRB::SLex::Node:0x00000002e8f560 @Tree={"&"=>#<IRB::SLex::Node:0x00000002e8f178 @Tree={"="=>#<IRB::SLex::Node:0x00000002e85b50 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e8e110@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:471>>}, @preproc=nil, @postproc=#<Proc:0x00000002e8f6c8@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:464>>, "="=>#<IRB::SLex::Node:0x00000002e8d030 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e8e110@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:471>>}, @preproc=nil, @postproc=#<
 Proc:0x00000002e8f6c8@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:464>>, "|"=>#<IRB::SLex::Node:0x00000002e8ee30 @Tree={"|"=>#<IRB::SLex::Node:0x00000002e8e750 @Tree={"="=>#<IRB::SLex::Node:0x00000002e86460 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e8e110@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:471>>}, @preproc=nil, @postproc=#<Proc:0x00000002e8f6c8@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:464>>, "="=>#<IRB::SLex::Node:0x00000002e8c1a8 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e8e110@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:471>>}, @preproc=nil, @postproc=#<Proc:0x00000002e8f6c8@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:464>>, "+"=>#<IRB::SLex::Node:0x00000002e8de90 @Tree={"="=>#<IRB::SLex::Node:0x00000002e8de40 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e8e110@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:471>>, "@"=>#<IRB::SLex::Node:0x00000002e852b8 @Tree={}, @preproc=#<Proc:0x00000002e85768@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:478>, @postproc=#<Proc:0x00000002e85740@c:/
 usr/lib/ruby/2.0.0/irb/ruby-lex.rb:478>>}, @preproc=nil, @postproc=#<Proc:0x00000002e843b8@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:490>>, "-"=>#<IRB::SLex::Node:0x00000002e8db98 @Tree={"="=>#<IRB::SLex::Node:0x00000002e8db48 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e8e110@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:471>>, "@"=>#<IRB::SLex::Node:0x00000002e84ed0 @Tree={}, @preproc=#<Proc:0x00000002e851a0@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:484>, @postproc=#<Proc:0x00000002e85150@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:484>>}, @preproc=nil, @postproc=#<Proc:0x00000002e843b8@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:490>>, "^"=>#<IRB::SLex::Node:0x00000002e87298 @Tree={"="=>#<IRB::SLex::Node:0x00000002e876d0 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e8e110@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:471>>}, @preproc=nil, @postproc=#<Proc:0x00000002e7e120@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:578>>, "."=>#<IRB::SLex::Node:0x00000002e7fd68 @Tree={"."=>#<IRB::SLex::Node:0x0000000
 2e7f930 @Tree={"."=>#<IRB::SLex::Node:0x00000002e7f548 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e7fc00@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:521>>}, @preproc=nil, @postproc=#<Proc:0x00000002e7fc00@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:521>>}, @preproc=nil, @postproc=#<Proc:0x00000002e7ff20@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:508>>, "]"=>#<IRB::SLex::Node:0x00000002e7f0e8 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e7f368@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:531>>, "}"=>#<IRB::SLex::Node:0x00000002e7ee40 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e7f368@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:531>>, ")"=>#<IRB::SLex::Node:0x00000002e7eb98 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e7f368@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:531>>, ":"=>#<IRB::SLex::Node:0x00000002e7e8a0 @Tree={":"=>#<IRB::SLex::Node:0x00000002e7e558 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e7e7d8@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:550>>}, @preproc=nil, @postproc
 =#<Proc:0x00000002e7ead0@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:539>>, "/"=>#<IRB::SLex::Node:0x00000002e7e238 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e7e490@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:562>>, ","=>#<IRB::SLex::Node:0x00000002e7dbd0 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e7ddd8@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:589>>, ";"=>#<IRB::SLex::Node:0x00000002e7d810 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e7da40@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:595>>, "~"=>#<IRB::SLex::Node:0x00000002e7d540 @Tree={"@"=>#<IRB::SLex::Node:0x00000002e7d0e0 @Tree={}, @preproc=#<Proc:0x00000002e7d400@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:612>, @postproc=#<Proc:0x00000002e7d388@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:612>>}, @preproc=nil, @postproc=#<Proc:0x00000002e7d770@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:606>>, "("=>#<IRB::SLex::Node:0x00000002e7cd98 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e7cfc8@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:618>>, 
 "["=>#<IRB::SLex::Node:0x00000002e7ca28 @Tree={"]"=>#<IRB::SLex::Node:0x00000002e7c9d8 @Tree={"="=>#<IRB::SLex::Node:0x00000002e7c5a0 @Tree={}, @preproc=#<Proc:0x00000002e7c898@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:638>, @postproc=#<Proc:0x00000002e7c870@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:638>>}, @preproc=#<Proc:0x00000002e7cc58@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:632>, @postproc=#<Proc:0x00000002e7cc30@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:632>>}, @preproc=nil, @postproc=#<Proc:0x00000002e7c4d8@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:644>>, "{"=>#<IRB::SLex::Node:0x00000002e7c0c8 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e7c2d0@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:663>>, "\\"=>#<IRB::SLex::Node:0x00000002e77e38 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e77fa0@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:676>>, "%"=>#<IRB::SLex::Node:0x00000002e77bb8 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e77d70@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:688>>, "$"=>#<I
 RB::SLex::Node:0x00000002e77988 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e77b18@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:703>>, "@"=>#<IRB::SLex::Node:0x00000002e776b8 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e778e8@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:708>>}, @preproc=nil, @postproc=#<Proc:0x00000002e775f0@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:728>>>
irb(main):001:0> exit
MATCH: start : #<RubyLex:0x00000002ea63a0 @OP=<SLex: @head = #<IRB::SLex::Node:0x00000002ea62b0 @Tree={"\0"=>#<IRB::SLex::Node:0x00000002ea5e50 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002ea6120@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:343>>, "\u0004"=>#<IRB::SLex::Node:0x00000002ea5928 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002ea6120@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:343>>, "\u001A"=>#<IRB::SLex::Node:0x00000002ea5540 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002ea6120@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:343>>, " "=>#<IRB::SLex::Node:0x00000002ea4e38 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002ea51d0@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:347>>, "\t"=>#<IRB::SLex::Node:0x00000002ea4b68 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002ea51d0@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:347>>, "\f"=>#<IRB::SLex::Node:0x00000002ea4668 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002ea51d0@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:347>>, "\r"=>#<IRB::SLe
 x::Node:0x00000002ea4078 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002ea51d0@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:347>>, "\v"=>#<IRB::SLex::Node:0x00000002e9feb0 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002ea51d0@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:347>>, "#"=>#<IRB::SLex::Node:0x00000002e9fbe0 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e9fdc0@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:354>>, "="=>#<IRB::SLex::Node:0x00000002e9f618 @Tree={"b"=>#<IRB::SLex::Node:0x00000002e9f5a0 @Tree={"e"=>#<IRB::SLex::Node:0x00000002e9f550 @Tree={"g"=>#<IRB::SLex::Node:0x00000002e9f460 @Tree={"i"=>#<IRB::SLex::Node:0x00000002e9f410 @Tree={"n"=>#<IRB::SLex::Node:0x00000002e9f3c0 @Tree={}, @preproc=#<Proc:0x00000002e9fb40@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:359>, @postproc=#<Proc:0x00000002e9fb18@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:359>>}, @preproc=nil, @postproc=nil>}, @preproc=nil, @postproc=nil>}, @preproc=nil, @postproc=nil>}, @preproc=nil, @postproc=nil>, "="=>#<IR
 B::SLex::Node:0x00000002e9d9a8 @Tree={"="=>#<IRB::SLex::Node:0x00000002e9d660 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>, "~"=>#<IRB::SLex::Node:0x00000002e9d1b0 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>, "\n"=>#<IRB::SLex::Node:0x00000002e9ecb8 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e9efd8@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:371>>, "*"=>#<IRB::SLex::Node:0x00000002e9e4c0 @Tree={"*"=>#<IRB::SLex::Node:0x00000002e9e010 @Tree={"="=>#<IRB::SLex::Node:0x00000002e8d4e0 @Tree={}, @preproc=nil, @postproc=#<Proc:0x00000002e8e110@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:471>>}, @preproc=nil, @postproc=#<Proc:0x00000002e9e858@c:/usr/lib/ruby/2.0.0/irb/ruby-lex.rb:395>>, "=
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\n

I think the patch https://bugs.ruby-lang.org/attachments/2611/irb_debug_level.patch should be applied for init.rb.
----------------------------------------
Bug #6301: irb 起動後に conf.debug_level を変更するとエラーになる
https://bugs.ruby-lang.org/issues/6301#change-35082

Author: sho-h (Sho Hashimoto)
Status: Closed
Priority: Normal
Assignee: keiju (Keiju Ishitsuka)
Category: lib
Target version: 
ruby -v: ruby 1.9.3p125 (2012-02-16 revision 34643) [x86_64-linux]


$ irb --irb_debug <数字> などでは問題ありませんが、irb の起動後に conf.debug_level を設定するとエラーになるようです。(1.9.3-p125 で確認しましたが、trunk でも同様のようです)

> conf.debug_level = "1"
NoMethodError: undefined method `debug_level=' for IRB::SLex:Class
	from /home/sho-h/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb/context.rb:245:in `debug_level='

IRB::SLex.debug_level を代入するのを止めるか、debug_level を追加するのがよいのではないかと思いました。

--- lib/irb/context.rb  (revision 35336)
+++ lib/irb/context.rb  (working copy)
@@ -242,7 +242,6 @@
     def debug_level=(value)
       @debug_level = value
       RubyLex.debug_level = value
-      SLex.debug_level = value
     end
 
     def debug?



-- 
http://bugs.ruby-lang.org/