[saghm]

> You don't really need language features, assuming your language has sum types, polymorphism and first class functions (and why bother using a language that's missing any of those).

To be fair, this is basically saying "you don't need language features as long as you have these language features".

[lmm]

Sure, but those are general language features that you'd want to have for many other reasons anyway. You don't need any option/result-specific language features.