For Rust at least, I get a warning by default: https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=869aae2aed2872770d91316e98efc682 https:/

For Rust at least, I get a warning by default: https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=869aae2aed2872770d91316e98efc682 https://play.rust-lang.org/?version=stable&mode=debug&editio... warning: unused `Result` that must be used --> src/main.rs:7:5 | 7 | foo(); | ^^^^^^ | = note: `#[warn(unused_must_use)]` on by default = note: this `Result` may be an `Err` variant, which should be handled The quick fix is to change `foo();` to `foo().unwrap();`, which panics if the call returns an Err variant. But seeing `unwrap` in the code lets me know where an error may occur. That's better than the silent failure we get in many other languages when a result code is left unhandled or a potential exception isn't wrapped in a `try` block.