error[E0716]: temporary value dropped while borrowed --> $DIR/transmute-const-promotion.rs:4:37 | LL | let x: &'static u32 = unsafe { &mem::transmute(3.0f32) }; | ------------ ^^^^^^^^^^^^^^^^^^^^^^ creates a temporary which is freed while still in use | | | type annotation requires that borrow lasts for `'static` LL | 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`.