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The rules behing Rust functions
Demystifying fn, Fn, FnMut, and FnOnce from everyday usage to compiler magic under the hood
When you write a closure, the Rust compiler internally transforms it into a compiler-generated anonymous struct with trait implementations: Since there's no captured state to store, Rust can coerce such closures directly to plain function pointers: Feel free to reach out on X, LinkedIn, or subscribe to my blog ( substack, medium) to keep pushing the boundaries together!
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