error: busy-waiting loop should at least have a spin loop hint
  --> $DIR/missing_spin_loop_no_std.rs:12:37
   |
LL |     while b.load(Ordering::Acquire) {}
   |                                     ^^ help: try: `{ core::hint::spin_loop() }`
   |
   = note: `-D clippy::missing-spin-loop` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::missing_spin_loop)]`

error: aborting due to 1 previous error