Add trailing comma when using mixed layout with block indent
Add trailing comma when using mixed layout with block indent

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