error[E0658]: dereferencing raw pointers in constants is unstable
  --> $DIR/const-suggest-feature.rs:2:5
   |
LL |     *std::ptr::null_mut() = 0;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #51911 <https://github.com/rust-lang/rust/issues/51911> for more information
   = help: add `#![feature(const_raw_ptr_deref)]` to the crate attributes to enable

error: aborting due to previous error

For more information about this error, try `rustc --explain E0658`.