Function quickcheck::empty_shrinker

Important traits for Box<R>

impl<R> Read for Box<R> where
    R: Read + ?Sized, impl<W> Write for Box<W> where
    W: Write + ?Sized, impl<I> Iterator for Box<I> where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

pub fn empty_shrinker<A: 'static>() -> Box<Iterator<Item = A>>

Creates a shrinker with zero elements.