Remove unnecessary format!() call
Remove unnecessary format!() call

rust-lang/rustfmt,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,rust-lang/rustfmt,SingingTree/rustfmt,aidancully/rust,aidancully/rust,SingingTree/rustfmt,graydon/rust,aidancully/rust,graydon/rust