tests/ui/privacy/decl-macro.rs - toolchain/rustc - Git at Google

 #![feature(decl_macro)]

 mod m {
     macro mac() {}
 }

 fn main() {
     m::mac!(); //~ ERROR macro `mac` is private
 }
	#![feature(decl_macro)]

	mod m {
	macro mac() {}
	}

	fn main() {
	m::mac!(); //~ ERROR macro `mac` is private
	}