2 specifically, just to um-actually a minor detail: Rust does have this problem. This code: https://repl.it/repls/LoathsomeCompleteColdfusion https://repl.it/r

2 specifically, just to um-actually a minor detail: Rust does have this problem. This code: https://repl.it/repls/LoathsomeCompleteColdfusion https://repl.it/repls/LoathsomeCompleteColdfusion #[must_use] fn get() -> i32 { 5 } fn main() { get(); } will compile and run. It does emit a warning by default at least though: warning: unused return value of `get` that must be used --> main.rs:7:3 | 7 | get(); | ^^^^^^ | = note: `#[warn(unused_must_use)]` on by default Without the `#[must_use]`, you won't even get that warning. Result has it, so it's common, but it's definitely not enforced. To get the Result's value though, yes - there's no way around it.