Fix a typo
Fix a typo

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