error[E0723]: mutable references in const fn are unstable | |
--> $DIR/feature-gate-const_mut_refs.rs:5:14 | |
| | |
LL | const fn foo(x: &mut i32) -> i32 { | |
| ^ | |
| | |
= note: for more information, see issue https://github.com/rust-lang/rust/issues/57563 | |
= help: add `#![feature(const_fn)]` to the crate attributes to enable | |
error: aborting due to previous error | |
For more information about this error, try `rustc --explain E0723`. |