error[E0658]: dereferencing raw mutable pointers in constants is unstable --> $DIR/const-suggest-feature.rs:2:5 | LL | *std::ptr::null_mut() = 0; | ^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: see issue #57349 for more information = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable error: aborting due to previous error For more information about this error, try `rustc --explain E0658`.