combine::parser::char

Function letter

Source 
pub fn letter<I>() -> Letter<I>
where
    I: Stream<Item = char>,
    I::Error: ParseError<I::Item, I::Range, I::Position>,
Expand description

Parses an alphabet letter according to std::char::is_alphabetic.

use combine::Parser;
use combine::parser::char::letter;
assert_eq!(letter().parse("a"), Ok(('a', "")));
assert_eq!(letter().parse("A"), Ok(('A', "")));
assert!(letter().parse("9").is_err());