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Here's an article I've been meaning to write, gauging interest:

In Java/C/etc a lot of thread safety advice comes down to "always be thread safe because you never know." Synchronized methods, mutexes hiding in data structures, etc.

#Rust makes it easier to write thread-safe code, but it also makes it _possible_ to write code that _can't_ be used across threads, and thus doesn't have to be thread-safe. This reduces complexity and improves performance by avoiding all that defensive coding.