| warning: taking a mutable reference to a `const` item |
| --> tests/ui-nightly/transmute-mut-const.rs:20:52 |
| | |
| 20 | const CONST_CONTEXT: &mut [u8; 2] = transmute_mut!(&mut ARRAY_OF_U8S); |
| | ^^^^^^^^^^^^^^^^^ |
| | |
| = note: each usage of a `const` item creates a new temporary |
| = note: the mutable reference will refer to this temporary, not the original `const` item |
| note: `const` item defined here |
| --> tests/ui-nightly/transmute-mut-const.rs:17:1 |
| | |
| 17 | const ARRAY_OF_U8S: [u8; 2] = [0u8; 2]; |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
| = note: `#[warn(const_item_mutation)]` on by default |
| |
| error[E0658]: mutable references are not allowed in constants |
| --> tests/ui-nightly/transmute-mut-const.rs:20:52 |
| | |
| 20 | const CONST_CONTEXT: &mut [u8; 2] = transmute_mut!(&mut ARRAY_OF_U8S); |
| | ^^^^^^^^^^^^^^^^^ |
| | |
| = 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 |
| |
| error[E0015]: cannot call non-const fn `transmute_mut::<'_, '_, [u8; 2], [u8; 2]>` in constants |
| --> tests/ui-nightly/transmute-mut-const.rs:20:37 |
| | |
| 20 | const CONST_CONTEXT: &mut [u8; 2] = transmute_mut!(&mut ARRAY_OF_U8S); |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
| | |
| = note: calls in constants are limited to constant functions, tuple structs and tuple variants |
| = note: this error originates in the macro `transmute_mut` (in Nightly builds, run with -Z macro-backtrace for more info) |
| |
| error[E0716]: temporary value dropped while borrowed |
| --> tests/ui-nightly/transmute-mut-const.rs:20:57 |
| | |
| 20 | const CONST_CONTEXT: &mut [u8; 2] = transmute_mut!(&mut ARRAY_OF_U8S); |
| | --------------------^^^^^^^^^^^^- |
| | | | |
| | | creates a temporary value which is freed while still in use |
| | temporary value is freed at the end of this statement |
| | using this value as a constant requires that borrow lasts for `'static` |
