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-rw-r--r--src/test/ui/issues/issue-14919.rs55
1 files changed, 55 insertions, 0 deletions
diff --git a/src/test/ui/issues/issue-14919.rs b/src/test/ui/issues/issue-14919.rs
new file mode 100644
index 000000000..943615433
--- /dev/null
+++ b/src/test/ui/issues/issue-14919.rs
@@ -0,0 +1,55 @@
+// run-pass
+#![allow(unused_must_use)]
+#![allow(dead_code)]
+// pretty-expanded FIXME #23616
+
+trait Matcher {
+ fn next_match(&mut self) -> Option<(usize, usize)>;
+}
+
+struct CharPredMatcher<'a, 'b> {
+ str: &'a str,
+ pred: Box<dyn FnMut(char) -> bool + 'b>,
+}
+
+impl<'a, 'b> Matcher for CharPredMatcher<'a, 'b> {
+ fn next_match(&mut self) -> Option<(usize, usize)> {
+ None
+ }
+}
+
+trait IntoMatcher<'a, T> {
+ fn into_matcher(self, _: &'a str) -> T;
+}
+
+impl<'a, 'b, F> IntoMatcher<'a, CharPredMatcher<'a, 'b>> for F where F: FnMut(char) -> bool + 'b {
+ fn into_matcher(self, s: &'a str) -> CharPredMatcher<'a, 'b> {
+ CharPredMatcher {
+ str: s,
+ pred: Box::new(self),
+ }
+ }
+}
+
+struct MatchIndices<M> {
+ matcher: M
+}
+
+impl<M: Matcher> Iterator for MatchIndices<M> {
+ type Item = (usize, usize);
+
+ fn next(&mut self) -> Option<(usize, usize)> {
+ 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<_>>();
+}