Run cargo fmt
Run cargo fmt

rustfmt removes trailing comma from a function call. This could be a bug.

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