Syntax and ast API docs

I've been reading this great tutorial on writing syntax extensions, but it appears that pretty much all of the syntax extension modules no longer have accessible API docs on rust-lang.org. Is this an oversight/bug or done on purpose? Is there some place else I should be looking?

Thanks,
Andrew

http://manishearth.github.io/rust-internals-docs/rustc/

Also you can build them yourself from a fresh github repo clone, it just takes ages. Edit: The way to do this is

$ git clone https://github.com/rust-lang/rust.git && cd rust && ./configure --enable-compiler-docs && make docs

To update the docs, you can just git pull (from within the rust directory) instead of the clone stuff, then rebuild. Since I've got a lot of lookups, I actually do this every now and then. You can also use e.g. make -j 4 if you have a quad core CPU to speed up the build.

Thanks @llogiq