error[E0658]: `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 | |         }
   | |_________^
   |
   = note: see issue #49146 <https://github.com/rust-lang/rust/issues/49146> for more information
   = help: add `#![feature(const_if_match)]` to the crate attributes to enable

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[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[E0308]: mismatched types
  --> $DIR/match-test-ptr-null.rs:5:22
   |
LL |       let _: [u8; 0] = [4; {
   |  ____________-------___^
   | |            |
   | |            expected due to this
LL | |         match &1 as *const i32 as usize {
LL | |
LL | |
...  |
LL | |         }
LL | |     }];
   | |______^ expected `0usize`, found `{
        match &1 as *const i32 as usize {
            0 => 42,
            n => n,
        }
    }`
   |
   = note: expected array `[u8; 0]`
              found array `[u8; _]`

error: aborting due to 4 previous errors

Some errors have detailed explanations: E0080, E0308, E0658.
For more information about an error, try `rustc --explain E0080`.