tools/rustbook: deny(rust_2018_idioms)
tools/rustbook: deny(rust_2018_idioms)

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