Don't use ExpnKind::descr to get the name of a bang macro.
Don't use ExpnKind::descr to get the name of a bang macro.

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