This is actually kind of an important concept given how the Java module system now works. There are lots of useful internal bits in the JDK that should really b

This is actually kind of an important concept given how the Java module system now works. There are lots of useful internal bits in the JDK that should really be available to outside use. But because the openjdk project wants to be able to move things around, the internals shouldn't be used directly by applications (shouldn't have ever been used, I guess). So extracting out these bits into separate library code is important. But it also stinks because now there's a fork of this compiler code, which won't necessarily get updates or fixes from openjdk (not without a lot of manual diligence). Anyway, it's definitely a commendable project and I hope that we see more like it.