error[E0599]: no function or associated item named `from_mut` found for struct `AtomicU64` in the current scope
  --> $DIR/atomic-from-mut-not-available.rs:5:36
   |
LL |     core::sync::atomic::AtomicU64::from_mut(&mut 0u64);
   |                                    ^^^^^^^^ function or associated item not found in `AtomicU64`
   |
note: if you're trying to build a new `AtomicU64`, consider using `AtomicU64::new` which returns `AtomicU64`
  --> $SRC_DIR/core/src/sync/atomic.rs:LL:COL
   = note: this error originates in the macro `atomic_int` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0599`.