2 // error-pattern: overflow evaluating the requirement `(): Sized`
3 // error-pattern: function cannot return without recursing
5 // Regression test for #91949.
6 // This hanged *forever* on 1.56, fixed by #90423.
8 #![recursion_limit = "256"]
12 struct IteratorOfWrapped<T, I: Iterator<Item = T>>(I);
14 impl<T, I: Iterator<Item = T>> Iterator for IteratorOfWrapped<T, I> {
15 type Item = Wrapped<T>;
16 fn next(&mut self) -> Option<Wrapped<T>> {
17 self.0.next().map(Wrapped)
21 fn recurse<T>(elements: T) -> Vec<char>
23 T: Iterator<Item = ()>,
25 recurse(IteratorOfWrapped(elements).map(|t| t.0))
29 recurse(std::iter::empty());