The only document I can think of outside of Niko Matsakis' blog (http://smallcultfollowing.com/babysteps/ http://smallcultfollowing.com/babysteps/) would be htt

The only document I can think of outside of Niko Matsakis' blog (http://smallcultfollowing.com/babysteps/ http://smallcultfollowing.com/babysteps/) would be https://github.com/rust-lang/rust/blob/master/src/librustc/infer/region_inference/README.md https://github.com/rust-lang/rust/blob/master/src/librustc/i...