Quick Notes to Help with Debugging

Comparing against ruby / ripper:

% rake cmp3 F=file.rb

This compiles the parser & lexer and then parses file.rb using both ruby, ripper, and ruby_parser in debug modes. The output is munged to be as uniform as possible and diffable. I'm using emacs' ediff-files3 to compare these files (via rake cmp3) all at once, but regular diff -u tmp/{ruby,rp} will suffice for most tasks.

From there? Good luck. I'm currently trying to backtrack from rule reductions to state change differences. I'd like to figure out a way to go from this sort of diff to a reasonable test that checks state changes but I don't have that set up at this point.