[caustic]

> It will probably be pretty hard to apply that to C (cpp) and Lisp (macros, and especially the programmable readers in some Lisps).

C is really hard to parse because of preprocessor. We built a prototype parser for it, and it mostly works, but it's not ready yet for the prime time.

Lisp must be a much simpler language to parse, though.

> scanning for API changes between two versions of a framework

Yes, we have this idea on the to-do list! Imagine that you are comparing two different branches of development, or two different tagged releases, and see high-level API changes between them.