Function combine::parser::char::spaces

pub fn spaces<I>() -> Spaces<I> where
    I: Stream<Item = char>,
    I::Error: ParseError<I::Item, I::Range, I::Position>, 

Skips over zero or more spaces according to std::char::is_whitespace.

This includes space characters, tabs and newlines.

use combine::Parser;
use combine::parser::char::spaces;
assert_eq!(spaces().parse(""), Ok(((), "")));
assert_eq!(spaces().parse("   "), Ok(((), "")));