Function wait_for 

pub fn wait_for<T>(
    deadline: Duration,
    desc: &str,
    probe: impl FnMut() -> Option<T>,
) -> T

Poll probe until it returns Some(value), or panic once deadline elapses.

This is the workspace’s standard replacement for blind sleeps: the wait observes real state, succeeds as soon as possible, and fails with a descriptive message instead of a misleading downstream assert.

let value = wait_for(Duration::from_secs(5), "reader applied resize", || {
    state.lock().unwrap_or_else(|err| err.into_inner()).applied.then_some(())
});

Panics

Panics if probe never returns Some within deadline.