[Feature Request] panic when user try get recursive lock.

[cathaysia]

I had notice that rwlock is not a recursive lock:

This lock uses a task-fair locking policy which avoids both reader and writer starvation. This means that readers trying to acquire the lock will block even if the lock is unlocked when there are writers waiting to acquire the lock. Because of this, attempts to recursively acquire a read lock within a single thread may result in a deadlock.

That is to say, I cannot acquire the read lock and write lock at the same time in one thread.

On Linux, trying to acquire a recursive lock on a non-recursive lock causes the program to crash. Should packing_lot also have this behavior? Crashing the program early can reduce debugging time (especially for problems like deadlocks)