Rust Programming

I think she is talking about this functionality which already exists. It is not very intuitive though.

let res = my_collection
.iter()
.map(|x| method_that_returns_result(x))
.collect::<Result<Vec<T>, Error>>()?;

So it turns a Vec<Result, Error> into Result<Vec<T>, Error>, and you can turn it into Vec<T> simply with ?. Otherwise you would probably need a for loop.