You seem to believe that Rust prevents memory leaks. It does not, and that's not what "memory safety" means.
Yes, Rust does not guarantee that it'll prevent memory leaks. But the design of the language does make it harder for you (and your collaborators/dependencies) to accidentally leak memory compared to, say, C++.
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Yes, Rust does not guarantee that it'll prevent memory leaks. But the design of the language does make it harder for you (and your collaborators/dependencies) to accidentally leak memory compared to, say, C++.