| // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // ignore-tidy-linelength |
| |
| 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 { |
| //~^ HELP: consider using an explicit lifetime parameter as shown: fn check<'r, I: Iterator<Item = usize>, T: Itble<'r, usize, I>>(cont: &'r T) |
| let cont_iter = cont.iter(); //~ ERROR: cannot infer |
| 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() {} |