pub fn lefts<L, R, Iter: Iterator<Either<L, R>>>(eithers: Iter) -> Lefts<L, R, Iter>
Extracts all the left values
Prefix searches with a type followed by a colon (e.g.
fn:) to restrict the search to a given type.
Accepted types are: fn, mod,
struct (or str), enum,
trait, typedef (or
tdef).