src/tools/rustfmt/tests/source/issue_4911.rs - rust-lang/rust - Git at Google

 #![feature(min_type_alias_impl_trait)]

 impl SomeTrait for SomeType {
     type SomeGAT<'a> where Self: 'a = impl SomeOtherTrait;
 }
	#![feature(min_type_alias_impl_trait)]

	impl SomeTrait for SomeType {
	type SomeGAT<'a> where Self: 'a = impl SomeOtherTrait;
	}