| use std::ops::Range; |
| |
| trait Itble<'r, T, I: Iterator<Item=T>> { fn iter(&'r self) -> I; } |
| |
| impl<'r> Itble<'r, usize, Range<usize>> for (usize, usize) { |
| fn iter(&'r self) -> Range<usize> { |
| let &(min, max) = self; |
| min..max |
| } |
| } |
| |
| fn check<'r, I: Iterator<Item=usize>, T: Itble<'r, usize, I>>(cont: &T) -> bool |
| { |
| let cont_iter = cont.iter(); |
| //~^ ERROR explicit lifetime required in the type of `cont` [E0621] |
| let result = cont_iter.fold(Some(0), |state, val| { |
| state.map_or(None, |mask| { |
| let bit = 1 << val; |
| if mask & bit == 0 {Some(mask|bit)} else {None} |
| }) |
| }); |
| result.is_some() |
| } |
| |
| fn main() { |
| check(&(3, 5)); |
| } |
