error[E0658]: casting pointers to integers in constants is unstable
  --> $DIR/match-test-ptr-null.rs:6:15
   |
LL |         match &1 as *const i32 as usize {
   |               ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #51910 <https://github.com/rust-lang/rust/issues/51910> for more information
   = 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`.