error[E0716]: temporary value dropped while borrowed --> $DIR/union_promotion.rs:8:29 | LL | let x: &'static bool = &unsafe { | ____________-------------____^ | | | | | type annotation requires that borrow lasts for `'static` LL | | Foo { a: &1 }.b == Foo { a: &2 }.b LL | | }; | |_____^ creates a temporary which is freed while still in use LL | } | - temporary value is freed at the end of this statement error: aborting due to previous error For more information about this error, try `rustc --explain E0716`.