error[E0658]: casting pointers to integers in constants is unstable (see issue #51910) --> $DIR/issue-52023-array-size-pointer-cast.rs:12:17 | LL | let _ = [0; (&0 as *const i32) as usize]; //~ ERROR casting pointers to integers in constants | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = help: add #![feature(const_raw_ptr_to_usize_cast)] to the crate attributes to enable error: aborting due to previous error For more information about this error, try `rustc --explain E0658`.