error[E0277]: the trait bound `Dst: IntoBytes` is not satisfied
  --> tests/ui-stable/transmute-mut-dst-not-intobytes.rs:24:36
   |
24 | const DST_NOT_AS_BYTES: &mut Dst = transmute_mut!(&mut Src);
   |                                    ^^^^^^^^^^^^^^^^^^^^^^^^
   |                                    |
   |                                    the trait `IntoBytes` is not implemented for `Dst`
   |                                    required by a bound introduced by this call
   |
   = note: Consider adding `#[derive(IntoBytes)]` to `Dst`
   = help: the following other types implement trait `IntoBytes`:
             ()
             AtomicBool
             AtomicI16
             AtomicI32
             AtomicI64
             AtomicI8
             AtomicIsize
             AtomicU16
           and $N others
note: required by a bound in `AssertDstIsIntoBytes`
  --> tests/ui-stable/transmute-mut-dst-not-intobytes.rs:24:36
   |
24 | const DST_NOT_AS_BYTES: &mut Dst = transmute_mut!(&mut Src);
   |                                    ^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `AssertDstIsIntoBytes`
   = note: this error originates in the macro `transmute_mut` (in Nightly builds, run with -Z macro-backtrace for more info)