13 pub struct Permutations<I: Iterator> {  struct
18 impl<I> Clone for Permutations<I>  argument
55 impl<I> fmt::Debug for Permutations<I>  implementation
59     debug_fmt_fields!(Permutations, vals, state);
62 pub fn permutations<I: Iterator>(iter: I, k: usize) -> Permutations<I> {  in permutations()
69         return Permutations {  in permutations()
90     Permutations {  in permutations()
96 impl<I> Iterator for Permutations<I>  implementation
106         let &mut Permutations { ref vals, ref state } = self;  in next()
127         let Permutations { vals, state } = self;  in count()  localVariable
170 impl<I> Permutations<I>  implementation
176         let &mut Permutations { ref mut vals, ref mut state } = self;  in advance()