src/test/rustdoc/edition-flag.rs - third_party/rust - Git at Google

 // compile-flags:--test -Z unstable-options
 // edition:2018

 /// ```rust
 /// fn main() {
 ///     let _ = async { };
 /// }
 /// ```
 fn main() {
     let _ = async { };
 }
	// compile-flags:--test -Z unstable-options
	// edition:2018

	/// ```rust
	/// fn main() {
	/// let _ = async { };
	/// }
	/// ```
	fn main() {
	let _ = async { };
	}