Function combine::byte::spaces

pub fn spaces<I>() -> Spaces<I> where
    I: Stream<Item = u8>, 

Skips over space zero or more times

use combine::Parser;
use combine::byte::spaces;
assert_eq!(spaces().parse(&b""[..]), Ok(((), &b""[..])));
assert_eq!(spaces().parse(&b"   "[..]), Ok(((), &b""[..])));