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• 12:58, 23 November 2025 PC talk contribs created page Rust’s ? Operator: Little Mark, Big Ergonomics (Created page with "500px You’re reading some Rust code and stumble on: let mut file = File::create("foo.txt")?; What’s that lone question mark doing there — and why does every idiomatic Rust project seem to love it? Short answer: ? is Rust’s error propagation operator. It says, “If this call succeeds, give me the value. If it fails, return the error from the current function—possibly converting it—right now.” No exceptions, no hid...")