tests/rustdoc-ui/doctest/test-compile-fail1.rs - third_party/github.com/rust-lang/rust - Git at Google

 //@ compile-flags:--test

 /// ```
 /// assert!(true)
 /// ```
 pub fn f() {}

 pub fn f() {}
 //~^ ERROR the name `f` is defined multiple times
	//@ compile-flags:--test

	/// ```
	/// assert!(true)
	/// ```
	pub fn f() {}

	pub fn f() {}
	//~^ ERROR the name `f` is defined multiple times