fix(transmute): cargo doesn't warn about dummy enum

Author: janTatesa

src/transmute.rs

@@ -33,6 +33,7 @@ pub fn transmute<A, B>(obj: A) -> B {
 	// Note that `data` is shared between `DummyEnum::A` and `DummyEnum::B`.
 	// This should hopefully be more reliable than spamming the stack with a value and hoping the memory
 	// is placed correctly by the compiler.
+	#[allow(dead_code)]
 	enum DummyEnum<A, B> {
 		A(Option<Box<A>>),
 		B(Option<Box<B>>),