1error[E0512]: cannot transmute between types of different sizes, or dependently-sized types 2 --> tests/ui-msrv/transmute-mut-size-decrease.rs:17:32 3 | 417 | const DECREASE_SIZE: &mut u8 = transmute_mut!(&mut [0u8; 2]); 5 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 6 | 7 = note: source type: `[u8; 2]` (16 bits) 8 = note: target type: `u8` (8 bits) 9 = note: this error originates in the macro `$crate::assert_size_eq` (in Nightly builds, run with -Z macro-backtrace for more info) 10 11error[E0658]: mutable references are not allowed in constants 12 --> tests/ui-msrv/transmute-mut-size-decrease.rs:17:47 13 | 1417 | const DECREASE_SIZE: &mut u8 = transmute_mut!(&mut [0u8; 2]); 15 | ^^^^^^^^^^^^^ 16 | 17 = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information 18 19error[E0015]: calls in constants are limited to constant functions, tuple structs and tuple variants 20 --> tests/ui-msrv/transmute-mut-size-decrease.rs:17:32 21 | 2217 | const DECREASE_SIZE: &mut u8 = transmute_mut!(&mut [0u8; 2]); 23 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 24 | 25 = note: this error originates in the macro `transmute_mut` (in Nightly builds, run with -Z macro-backtrace for more info) 26 27error[E0716]: temporary value dropped while borrowed 28 --> tests/ui-msrv/transmute-mut-size-decrease.rs:17:52 29 | 3017 | const DECREASE_SIZE: &mut u8 = transmute_mut!(&mut [0u8; 2]); 31 | --------------------^^^^^^^^- 32 | | | 33 | | creates a temporary which is freed while still in use 34 | temporary value is freed at the end of this statement 35 | using this value as a constant requires that borrow lasts for `'static` 36