rustc: make ppaux' print macro use only one closure.
rustc: make ppaux' print macro use only one closure.

graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust