Unsound usage of get_unchecked

[charlesxsh]

src/scheduler.rs:211

 pub fn run_queued_tasks(&self, id: usize) {
        let local = unsafe { self.local_queues.get_unchecked(id) };
        let stealers = unsafe { self.stealers.get_unchecked(id) };
        loop {
            // Pop a task from the local queue
            let co = local.pop().or_else(|| {

The parameter id in Scheduler::run_queued_tasks used in get_unchecked without sufficient check. The function itself is public and safe function. The developer might cause memory risks. In Rust, we should not cause any memory issues by merely using safe functions.

Suggestions:

1. mark the function as unsafe
2. add sufficient boundary check