mruby/mruby — pull request #35 by fceller (2012-04-22 05:44:09+00:00)
Title: simple fix for underflow when pushback is involved

This is a (simple) fix for underflow. It is not perfect. It would be better to check in pushback and "repair" lineno and column there. But this requires a more complicated structure to keep track of the columns in the previous line(s). Which is completed if more than one pushback is allowed.