Bug #4138: Test Failure because of  method redefined: test/irb/test_option.rb
http://redmine.ruby-lang.org/issues/show/4138

ɼ???: Yui NARUSE
?????????: Assigned, ?????: Normal
???????: Nobuyoshi Nakada
ruby -v: ruby 1.9.3dev (2010-12-08 trunk 30145) [x86_64-freebsd8.1]

test-all ???以???????????失?????????????

  2) Failure:
test_end_of_option(TestIRB::TestOption) [/home/naruse/ruby/test/irb/test_option.rb:8]:
[ruby-core:33574].
<[]> expected but was
<["/home/naruse/ruby/lib/irb/ext/save-history.rb:29: warning: method redefined; discarding old save_history=",
 "/home/naruse/ruby/lib/irb/extend-command.rb:211: warning: previous definition of save_history= was here"]>.


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