[flohofwoe]

IMHO the ugly thing about Result and Option (and a couple of other Rust features) is that they are stdlib types, basic functionality like this should be language syntax (this is also my main critique of 'modern C++').

And those 'special' stdlib types wouldn't be half as useful without supporting language syntax, so why not go the full way and just implement everything in the language?

[choeger]

Uh, nope. Your language needs to be able to define these types. So they belong into the stdlib because they are useful, not because they are special.

You might add syntactic sugar on top, but you don't want these kinds of things in your fundamental language definition.