Unify pair formatting code
Unify pair formatting code

aidancully/rust,SingingTree/rustfmt,rust-lang/rustfmt,flutterhash/rustfmt,graydon/rust,aidancully/rust,aidancully/rust,Emilgardis/rustfmt,graydon/rust,SingingTree/rustfmt,rust-lang/rustfmt,aidancully/rust,studoot/rustfmt,graydon/rust,graydon/rust,graydon/rust,studoot/rustfmt,aidancully/rust,Emilgardis/rustfmt,aidancully/rust,graydon/rust