Assertion failed with Git's version of quickcheck

[vi]

thread 'it_works' panicked at 'assertion failed: bytes <= mem::size_of::<usize>()', /mnt/src/git/quickcheck/src/shrink.rs:86

Version is 43665bd (plus #116 ).

[vi]

For reference, the source:

extern crate quickcheck;
#[macro_use] extern crate custom_derive;

use quickcheck::Arbitrary;


custom_derive! {
#[derive(Clone,Debug)]
struct Mumu {
    a : u32,
    b : String,
}
}


#[derive(Clone,Debug)]
enum Qqq {
    Lol,
    Ror,
    Kokoko(Mumu),
    Totot(u32),
}

impl Arbitrary for Mumu {
    fn arbitrary<G : quickcheck::Gen>(g:&mut G) -> Mumu {
        Mumu {a : Arbitrary::arbitrary(g), b : Arbitrary::arbitrary(g) }
    }
    fn shrink(&self) -> Box<Iterator<Item=Self>> {
        Box::new ( (self.a.clone(), self.b.clone()).shrink().map(|(aa,bb)| Mumu { a: aa, b:bb}))
    }
}

impl Arbitrary for Qqq {
    fn arbitrary<G : quickcheck::Gen>(g:&mut G) -> Qqq {
        let y = g.next_u32() % 4;
        match y {
            0 => Qqq::Lol,
            1 => Qqq::Ror,
            2 => Qqq::Kokoko(Arbitrary::arbitrary(g)),
            3 => Qqq::Totot(Arbitrary::arbitrary(g)),
            _ => panic!(),
        }
    }
    fn shrink(&self) -> Box<Iterator<Item=Self>> {
        match self {
            &Qqq::Totot(ref x) => Box::new(x.shrink().map(|s| Qqq::Totot(s))),
            &Qqq::Kokoko(ref x) => Box::new(x.shrink().map(|s| Qqq::Kokoko(s))),
            _ => quickcheck::empty_shrinker(),
        }
    }
}



#[test]
fn it_works() {
    fn qqq(x : Qqq) -> bool {
        if let Qqq::Kokoko(Mumu { a : v, b: bb }) = x {
            //println!("{}\n", bb);
            return v != 4 && bb.chars().nth(1).unwrap_or('4') != '1'
        }
        true
    }

    quickcheck::QuickCheck::new().tests(10_000_000).quickcheck(qqq as fn(Qqq) -> bool);
    /*quickcheck::QuickCheck::new().tests(1000_000_000).quickcheck(qqq as fn(Qqq) -> bool);
    quickcheck::QuickCheck::new().tests(1000_000_000).quickcheck(qqq as fn(Qqq) -> bool);
    quickcheck::QuickCheck::new().tests(1000_000_000).quickcheck(qqq as fn(Qqq) -> bool);
    quickcheck::QuickCheck::new().tests(1000_000_000).quickcheck(qqq as fn(Qqq) -> bool);
    quickcheck::QuickCheck::new().tests(1000_000_000).quickcheck(qqq as fn(Qqq) -> bool);
    quickcheck::QuickCheck::new().tests(1000_000_000).quickcheck(qqq as fn(Qqq) -> bool);
    quickcheck::QuickCheck::new().tests(1000_000_000).quickcheck(qqq as fn(Qqq) -> bool);
    quickcheck::QuickCheck::new().tests(1000_000_000).quickcheck(qqq as fn(Qqq) -> bool);*/
}

[BurntSushi]

I think this should be fixed now. @vi can you confirm?