{"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"//"}]}
// it's ok to implement `Sync` as long as `P: Sync, T: Sync`
// `TaggedRef<P, T, ..>` is semantically just `{ ptr: P, tag: T }`, as such
unsafe impl<P, T> Sync for TaggedRef<'_, P, T>