[ruby-dev:33129] uninitialized constant Encoding::ASCII_8BIT (NameError)

最近、test-all が動かないような気がします。

% make test-all
./miniruby -I./lib -I.ext/i686-linux  ./runruby.rb --extout=.ext  -- "./test/runner.rb" --basedir="./test" --runner=console 
/home/akr/ruby/yarvo0/ruby/test/ruby/test_io_m17n.rb:7:in `<class:TestIO_M17N>': uninitialized constant Encoding::ASCII_8BIT (NameError)
        from /home/akr/ruby/yarvo0/ruby/test/ruby/test_io_m17n.rb:5:in `<top (required)>'
        from /home/akr/ruby/yarvo0/ruby/lib/test/unit/collector/dir.rb:90:in `require'
        from /home/akr/ruby/yarvo0/ruby/lib/test/unit/collector/dir.rb:90:in `collect_file'
        from /home/akr/ruby/yarvo0/ruby/lib/test/unit/collector/dir.rb:73:in `block in recursive_collect'
        from /home/akr/ruby/yarvo0/ruby/lib/test/unit/collector/dir.rb:58:in `each'
        from /home/akr/ruby/yarvo0/ruby/lib/test/unit/collector/dir.rb:58:in `recursive_collect'
        from /home/akr/ruby/yarvo0/ruby/lib/test/unit/collector/dir.rb:63:in `block in recursive_collect'
        from /home/akr/ruby/yarvo0/ruby/lib/test/unit/collector/dir.rb:58:in `each'
        from /home/akr/ruby/yarvo0/ruby/lib/test/unit/collector/dir.rb:58:in `recursive_collect'
        from /home/akr/ruby/yarvo0/ruby/lib/test/unit/collector/dir.rb:29:in `collect'
        from /home/akr/ruby/yarvo0/ruby/lib/test/unit/autorunner.rb:68:in `block (1 levels) in <class:AutoRunner>'
        from /home/akr/ruby/yarvo0/ruby/lib/test/unit/autorunner.rb:213:in `[]'
        from /home/akr/ruby/yarvo0/ruby/lib/test/unit/autorunner.rb:213:in `run'
        from /home/akr/ruby/yarvo0/ruby/lib/test/unit/autorunner.rb:12:in `run'
        from ./test/runner.rb:9:in `<main>'
make: *** [test-all] Error 1
zsh: exit 2     make test-all
% ./ruby -v    
ruby 1.9.0 (2008-01-16 revision 0) [i686-linux]
-- 
[田中 哲][たなか あきら][Tanaka Akira]