error[E0018]: raw pointers cannot be cast to integers in constants
  --> $DIR/issue-18294.rs:13:22
   |
LL |     const Y: usize = &X as *const u32 as usize; //~ ERROR E0018
   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0018`.