Drop only the first occurrence of `fmt` while preparing CLI arguments
Drop only the first occurrence of `fmt` while preparing CLI arguments

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