Function combine::parser::byte::lower

pub fn lower<I>() -> Lower<I> where
    I: Stream<Item = u8>,
    I::Error: ParseError<I::Item, I::Range, I::Position>, 

Parses an lowercase ASCII letter (a–z).

use combine::Parser;
use combine::parser::byte::lower;
assert_eq!(lower().parse(&b"a"[..]), Ok((b'a', &b""[..])));
assert!(lower().parse(&b"A"[..]).is_err());