error: pointers cannot be cast to integers during const eval --> $DIR/issue-18294.rs:3:31 | LL | const Y: usize = unsafe { &X as *const u32 as usize }; | ^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: at compile-time, pointers do not have an integer value = note: avoiding this restriction via `transmute`, `union`, or raw pointers leads to compile-time undefined behavior error: aborting due to 1 previous error