Rust: What is the difference between sync::Weak and tokio::sync::Weak?

sync::Weak — weak reference. tokio::sync::Weak — same (re-export).

sync::Weak:

• Weak reference.
• Does not prevent drop.
• Standard library.

tokio::sync::Weak:

• Re-export of std::sync::Weak.
• Same functionality.
• For convenience.

1use std::sync::{Arc, Weak};
2
3let strong = Arc::new(5);
4let weak = Arc::downgrade(&strong);

Key: Both are the same Weak.