readline.c: str_subpos
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56820 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
readline.c: str_subpos
if necessary.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56820 b2dd03c8-39d4-4d8f-98ff-823fe69b080e