error[E0764]: mutable references are not allowed in the final value of constants --> $DIR/issue-76510.rs:5:29 | LL | const S: &'static mut str = &mut " hello "; | ^^^^^^^^^^^^^^ error[E0658]: mutation through a reference is not allowed in constants --> $DIR/issue-76510.rs:5:29 | LL | const S: &'static mut str = &mut " hello "; | ^^^^^^^^^^^^^^ | = note: see issue #57349 for more information = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable error[E0596]: cannot borrow data in a `&` reference as mutable --> $DIR/issue-76510.rs:5:29 | LL | const S: &'static mut str = &mut " hello "; | ^^^^^^^^^^^^^^ cannot borrow as mutable note: erroneous constant used --> $DIR/issue-76510.rs:11:70 | LL | let s = transmute::<(*const u8, usize), &ManuallyDrop>((S.as_ptr(), 3)); | ^ error: aborting due to 3 previous errors Some errors have detailed explanations: E0596, E0658, E0764. For more information about an error, try `rustc --explain E0596`.