error[E0512]: cannot transmute between types of different sizes, or dependently-sized types --> tests/ui-msrv/transmute-mut-alignment-increase.rs:19:39 | 19 | const INCREASE_ALIGNMENT: &mut AU16 = transmute_mut!(&mut [0u8; 2]); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: source type: `AlignOf<[u8; 2]>` (8 bits) = note: target type: `MaxAlignsOf<[u8; 2], AU16>` (16 bits) = note: this error originates in the macro `$crate::assert_align_gt_eq` (in Nightly builds, run with -Z macro-backtrace for more info) error[E0658]: mutable references are not allowed in constants --> tests/ui-msrv/transmute-mut-alignment-increase.rs:19:54 | 19 | const INCREASE_ALIGNMENT: &mut AU16 = transmute_mut!(&mut [0u8; 2]); | ^^^^^^^^^^^^^ | = note: see issue #57349 for more information error[E0015]: cannot call non-const fn `transmute_mut::<[u8; 2], AU16>` in constants --> tests/ui-msrv/transmute-mut-alignment-increase.rs:19:39 | 19 | const INCREASE_ALIGNMENT: &mut AU16 = transmute_mut!(&mut [0u8; 2]); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = 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-msrv/transmute-mut-alignment-increase.rs:19:59 | 19 | const INCREASE_ALIGNMENT: &mut AU16 = transmute_mut!(&mut [0u8; 2]); | --------------------^^^^^^^^- | | | | | creates a temporary 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`