What’s the most idiomatic way of working with an Iterator of Results? [duplicate]

There are lots of ways you could mean this.

If you just want to panic, use .map(|x| x.unwrap()).

If you want all results or a single error, collect into a Result<X<T>>:

let results: Result<Vec<i32>, _> = result_i32_iter.collect();

If you want everything except the errors, use .filter_map(|x| x.ok()) or .flat_map(|x| x).

If you want everything up to the first error, use .scan((), |_, x| x.ok()).

let results: Vec<i32> = result_i32_iter.scan((), |_, x| x.ok());

Note that these operations can be combined with earlier operations in many cases.