error[E0277]: the trait bound `NotZerocopy: zerocopy::IntoBytes` is not satisfied --> tests/ui-nightly/try_transmute_mut-src-not-intobytes.rs:19:52 | 19 | let src_not_into_bytes: Result<&mut AU16, _> = try_transmute_mut!(src); | ^^^^^^^^^^^^^^^^^^^^^^^ the trait `zerocopy::IntoBytes` is not implemented for `NotZerocopy` | = note: Consider adding `#[derive(IntoBytes)]` to `NotZerocopy` = help: the following other types implement trait `zerocopy::IntoBytes`: () AU16 AtomicBool AtomicI16 AtomicI32 AtomicI64 AtomicI8 AtomicIsize and $N others note: required by a bound in `try_transmute_mut` --> src/util/macro_util.rs | | pub fn try_transmute_mut(src: &mut Src) -> Result<&mut Dst, ValidityError<&mut Src, Dst>> | ----------------- required by a bound in this function | where | Src: IntoBytes, | ^^^^^^^^^ required by this bound in `try_transmute_mut` = note: this error originates in the macro `try_transmute_mut` (in Nightly builds, run with -Z macro-backtrace for more info)