rustc -> rustc_middle part 4 -- pacify tidy
rustc -> rustc_middle part 4 -- pacify tidy

graydon/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust