bitv each() method loops forever

[nikomatsakis]

This program:

use std;
    import std::bitv;

    fn main() {
        let bits = bitv::bitv(8u, false);
        io::println(bitv::to_str(bits));
    }

infinitely loops, probably due to this definition from bitv.rs:

fn each(v: bitv, f: fn(bool) -> bool) {
    let mut i = 0u;
    while i < v.nbits {
        if !f(get(v, i)) { break; }
    }
}

which never increments i.

[catamorphism]

One reason why "never add code without adding a test case for it" is a good rule :-)

[bkircher]

This can be closed, see #2457.