1warning: taking a mutable reference to a `const` item
2  --> tests/ui-nightly/transmute-mut-const.rs:20:52
3   |
420 | const CONST_CONTEXT: &mut [u8; 2] = transmute_mut!(&mut ARRAY_OF_U8S);
5   |                                                    ^^^^^^^^^^^^^^^^^
6   |
7   = note: each usage of a `const` item creates a new temporary
8   = note: the mutable reference will refer to this temporary, not the original `const` item
9note: `const` item defined here
10  --> tests/ui-nightly/transmute-mut-const.rs:17:1
11   |
1217 | const ARRAY_OF_U8S: [u8; 2] = [0u8; 2];
13   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
14   = note: `#[warn(const_item_mutation)]` on by default
15
16error[E0658]: mutable references are not allowed in constants
17  --> tests/ui-nightly/transmute-mut-const.rs:20:52
18   |
1920 | const CONST_CONTEXT: &mut [u8; 2] = transmute_mut!(&mut ARRAY_OF_U8S);
20   |                                                    ^^^^^^^^^^^^^^^^^
21   |
22   = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
23   = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
24   = note: this compiler was built on 2024-06-18; consider upgrading it if it is out of date
25
26error[E0015]: cannot call non-const fn `transmute_mut::<'_, '_, [u8; 2], [u8; 2]>` in constants
27  --> tests/ui-nightly/transmute-mut-const.rs:20:37
28   |
2920 | const CONST_CONTEXT: &mut [u8; 2] = transmute_mut!(&mut ARRAY_OF_U8S);
30   |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
31   |
32   = note: calls in constants are limited to constant functions, tuple structs and tuple variants
33   = note: this error originates in the macro `transmute_mut` (in Nightly builds, run with -Z macro-backtrace for more info)
34