Tests/RustOnly/libc.rs - third_party/github.com/Kitware/CMake - Git at Google

 #[no_mangle]
 pub extern "C" fn libc_greet() {
     println!("Hello from libc");
 }
	#[no_mangle]
	pub extern "C" fn libc_greet() {
	println!("Hello from libc");
	}