error: pointers cannot be cast to integers during const eval --> $DIR/issue-17458.rs:1:28 | LL | static X: usize = unsafe { core::ptr::null::() 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