src/test/ui/error-codes/E0152.rs - third_party/rust - Git at Google

 #![feature(lang_items)]

 #[lang = "arc"]
 struct Foo; //~ ERROR E0152

 fn main() {
 }
	#![feature(lang_items)]

	#[lang = "arc"]
	struct Foo; //~ ERROR E0152

	fn main() {
	}