src/test/run-pass/lint-dead-code-variant.rs - toolchain/rustc - Git at Google

 #![deny(dead_code)]

 enum Foo {
     A,
     B,
 }

 pub fn main() {
     match Foo::A {
         Foo::A | Foo::B => Foo::B
     };
 }
	#![deny(dead_code)]

	enum Foo {
	A,
	B,
	}

	pub fn main() {
	match Foo::A {
	Foo::A \| Foo::B => Foo::B
	};
	}