| error[E0658]: mutable references are not allowed in constant functions |
| --> $DIR/feature-gate-const_mut_refs.rs:5:14 |
| | |
| LL | const fn foo(x: &mut i32) -> i32 { |
| | ^ |
| | |
| = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information |
| = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable |
| = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date |
| |
| error: aborting due to 1 previous error |
| |
| For more information about this error, try `rustc --explain E0658`. |
