io.c: ID instead of Symbol
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47804 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
io.c: ID instead of Symbol
not Symbols.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47804 b2dd03c8-39d4-4d8f-98ff-823fe69b080e