mirror of https://github.com/rust-lang/rustlings
docs: add more info in threads
info.toml: ```toml [[exercises]] name = "threads3" path = "exercises/threads/threads3.rs" mode = "test" hint = """ An alternate way to handle concurrency between threads is to use a mpsc (multiple producer, single consumer) channel to communicate. With both a sending end and a receiving end, it's possible to send values in one thread and receive them in another. Multiple producers are possible by using clone() to create a duplicate of the original sending end. See https://doc.rust-lang.org/book/ch16-02-message-passing.html for more info. """ ``` threads3'hint contains this link, so it should be placed in Further Informationpull/1944/head
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