Rust str each_char error.

gistfile1.rs

use core::str::*;

fn main() {
    let s = ~"hello";
    let f = |ch| { io::println(fmt!("%?",ch)); true };

    // Works:
    each_char(s, f);
    // Fails:
    // s.each_char(f);

    // Works:
    for s.each_chari |_ch, _i| {}
    // Works:
    for s.each_char_reverse |_ch| {}
    // Fails:
    // for s.each_char |_ch| {}

    // error: failed to find an implementation of trait core::io::Reader for <V10>
}