Not really a Rust programmer, but I would expect a Range of vectors to operate something like a vector of Ranges. So if you say [0,10]..[20, 30], the length would be twenty, and the elements would be [1,11], [2,12]... Presumably if there was asymmetry in the values like [1,10]..[20, 50] you'd end up with...something? Not really sure what it should be, there are lots of options!
The fact that there are options is my point: it's ambiguous. That's the reason there is no implementation for it in the std lib. You're absolutely free in Rust to define your own though.
