rust/tests/ui/issues/issue-14919.rs

Ignoring revisions in .git-blame-ignore-revs. Click here to bypass and see the normal blame view.

56 lines
1.2 KiB
Rust
Raw Normal View History

// run-pass
#![allow(unused_must_use)]
#![allow(dead_code)]
// pretty-expanded FIXME #23616
2014-10-02 14:52:06 -05:00
trait Matcher {
fn next_match(&mut self) -> Option<(usize, usize)>;
2014-10-02 14:52:06 -05:00
}
struct CharPredMatcher<'a, 'b> {
str: &'a str,
2019-05-28 13:47:21 -05:00
pred: Box<dyn FnMut(char) -> bool + 'b>,
2014-10-02 14:52:06 -05:00
}
impl<'a, 'b> Matcher for CharPredMatcher<'a, 'b> {
fn next_match(&mut self) -> Option<(usize, usize)> {
2014-10-02 14:52:06 -05:00
None
}
}
trait IntoMatcher<'a, T> {
fn into_matcher(self, _: &'a str) -> T;
2014-10-02 14:52:06 -05:00
}
2015-01-02 16:32:54 -06:00
impl<'a, 'b, F> IntoMatcher<'a, CharPredMatcher<'a, 'b>> for F where F: FnMut(char) -> bool + 'b {
2014-10-02 14:52:06 -05:00
fn into_matcher(self, s: &'a str) -> CharPredMatcher<'a, 'b> {
CharPredMatcher {
str: s,
pred: Box::new(self),
2014-10-02 14:52:06 -05:00
}
}
}
struct MatchIndices<M> {
matcher: M
}
2015-01-02 09:25:54 -06:00
impl<M: Matcher> Iterator for MatchIndices<M> {
type Item = (usize, usize);
2015-01-02 09:25:54 -06:00
fn next(&mut self) -> Option<(usize, usize)> {
2014-10-02 14:52:06 -05:00
self.matcher.next_match()
}
}
fn match_indices<'a, M, T: IntoMatcher<'a, M>>(s: &'a str, from: T) -> MatchIndices<M> {
let string_matcher = from.into_matcher(s);
MatchIndices { matcher: string_matcher }
}
fn main() {
let s = "abcbdef";
match_indices(s, |c: char| c == 'b')
.collect::<Vec<_>>();
2014-10-02 14:52:06 -05:00
}