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[E0019]: constant contains unimplemented expression type
  --> $DIR/match-test-ptr-null.rs:9:13
   |
LL |             0 => 42,
   |             ^

error[E0080]: evaluation of constant value failed
  --> $DIR/match-test-ptr-null.rs:9:13
   |
LL |             0 => 42,
   |             ^ "pointer arithmetic or comparison" needs an rfc before being allowed inside constants

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0019, E0080, E0658.
For more information about an error, try `rustc --explain E0019`.