Go funcs can return both a value and an error, or neither, it's a common gotcha. Having to check the behavior each time is no fun.
replyMissing error handling is checked at compile-time in Rust (lint-time in Go), and can be enabled for any struct or function (https://doc.rust-lang.org/reference/attributes/diagnostics.h...), not just `Result<T,E>`.
Returning an error to the caller in Rust can be done with a single character.
In Go you can ignore the error value though, and use directly the returned value (`int` in your example). In Rust you cannot do that, you need to unwrap the Result or use the `?`
replyIf the returned value is still valid despite an error, then the function would return (u32, Option<Error>), perfectly valid rust. If the value is meaningless in case of an error then using it is incorrect code; you wouldn't want to do that in either language and rust makes that assumption explicit with unwrap. If you want a default value in case of error just use unwrap_or_default.
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