I like the Rust way of error handling. For those unfamiliar, there is a Result enum which can be Ok or Err. This is returned to indicate success or failure (so no `throw ` or bare booleans/integers).

In many cases, a failure needs to be propagated several stack frames. Because `if … return ` constructs get tedious, Rust has the `? ` postfix.

I like the idea, but I’d prefer a (prefix) keyword. Imagine it’s for a new language.

So if (no specific language):

function do_thing(): Result<T, E>

Then

THE_KEYWORD do_thing()

Translates to

if let Err(x) = do_thing() { return Err(x); }

So essentially the same as Rust’s

do_thing()?

My questions:

1. Is there already a keyword for this in some languages? Is there a convention?
2. What keyword would you choose for this?