resolve build warnings in clippy_lints/src/format.rs
resolve build warnings in clippy_lints/src/format.rs

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