Code
use std::sync::Mutex;
macro_rules! declare_mutex {
() => {
static mut MACRO_MUTEX: Mutex<bool> = Mutex::new(false);
};
}
declare_mutex!();
fn main() {
let _lock = unsafe { MACRO_MUTEX.lock().unwrap() };
//~^ ERROR creating a shared reference to mutable static [static_mut_refs]
}Current output
error: creating a shared reference to mutable static
--> src/main.rs:12:26
|
12 | let _lock = unsafe { MACRO_MUTEX.lock().unwrap() };
| ^^^^^^^^^^^^^^^^^^ shared reference to mutable static
|
= note: shared references to mutable statics are dangerous; it's undefined behavior if the static is mutated or if a mutable reference is created for it while the shared reference lives
= help: use a type that relies on "interior mutability" instead; to read more on this, visit <https://doc.rust-lang.org/reference/interior-mutability.html>
= note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2024/static-mut-references.html>
= note: `#[deny(static_mut_refs)]` (part of `#[deny(rust_2024_compatibility)]`) on by defaultDesired output
I am not sure, but it should not suggest something that the code already does.
Rationale and extra context
Mutex<bool> is a type with interior mutability. It makes no sense to ask users to use a type with interior mutability instead of this one.
This got introduced in #151362.
Other cases
Rust Version
1.98.0-nightly
(2026-07-02 c397dae808f70caebab1)
Anything else?
No response
Code
Current output
Desired output
Rationale and extra context
Mutex<bool>is a type with interior mutability. It makes no sense to ask users to use a type with interior mutability instead of this one.This got introduced in #151362.
Other cases
Rust Version
Anything else?
No response