particular class/module. [Ruby2] * variable.c (rb_cvar_get): ditto. * io.c (rb_io_sync): need not to check writable. [ruby-core:02674] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@5977 b2dd03c8-39d4-4d8f-98ff-823fe69b080e