Partially moved just means that the compiler tracks which fields have been “moved out” of the struct and prevents you from either accessing those fields or attempting to reuse the partially moved struct as if it were still a whole struct, since it is no longer whole... it has given up some of its members, conceptually.
In the article linked by this discussion, the author specifically mentions how fields can’t be moved out in D’s implementation.
Option is the correct approach for dealing with information that might be missing, but that’s not really related to partially moved structs.
Structs document what is available in a given value, to both the compiler and to you. If that’s not convincing, then I’m not going to try more here... it’s off topic. But I will say you can use maps in Rust or other statically typed languages. They’re just not meant to be an alternative to well-defined structs.
Can Rust now handle partial move semantics on structs? I remember reading it couldn't do it before, and there were threads about how you should make small structs because of that, or that you should not use methods, because they take ownership of the full struct and not just the fields that they actually use, etc.
Sure, my intention was not to get in a dynamic vs static lang argument, when seeing "partial moved structs" and "ergonomics" in the same sentence my mind jump to think that there is something Rust that can make it feel closer to a dynamic lang regarding types ;) Thanks.
In the article linked by this discussion, the author specifically mentions how fields can’t be moved out in D’s implementation.
Option is the correct approach for dealing with information that might be missing, but that’s not really related to partially moved structs.
Structs document what is available in a given value, to both the compiler and to you. If that’s not convincing, then I’m not going to try more here... it’s off topic. But I will say you can use maps in Rust or other statically typed languages. They’re just not meant to be an alternative to well-defined structs.