error[E0744]: `match` is not allowed in a `const`
  --> $DIR/match-test-ptr-null.rs:6:9
   |
LL | /         match &1 as *const i32 as usize {
LL | |
LL | |
LL | |
LL | |             0 => 42,
LL | |             n => n,
LL | |         }
   | |_________^

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: for more information, see https://github.com/rust-lang/rust/issues/51910
   = help: add `#![feature(const_raw_ptr_to_usize_cast)]` to the crate attributes to enable

error[E0080]: evaluation of constant value failed
  --> $DIR/match-test-ptr-null.rs:6:15
   |
LL |         match &1 as *const i32 as usize {
   |               ^^^^^^^^^^^^^^^^^^^^^^^^^ "pointer-to-integer cast" needs an rfc before being allowed inside constants

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0080, E0658, E0744.
For more information about an error, try `rustc --explain E0080`.