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error[E0723]: mutable references in const fn are unstable
--> $DIR/feature-gate-const_mut_refs.rs:5:14
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LL | const fn foo(x: &mut i32) -> i32 {
| ^
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= 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`.
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