Treating generated files as primary source is a disaster waiting to happen. Someone will end up just doing a quick edit of the derived file because yacc isn't set up right, or running a sed command to do a refactoring, or just not understand the difference. One of the things that I like about go is that it does a good job of keeping the codebase clean; recommending a solution that sets up this sort of trap is a big departure.

I wonder what other approaches are available for packages that intend to distribute in source form, however. I could imagine adding a parallel directory structure for the generated files, to make it clear that they are out of bounds, akin to the mvn source / target layout.