2 // compile-flags: -Zinline-mir=no
3 // error-pattern: overflow evaluating the requirement `(): Sized`
4 // error-pattern: function cannot return without recursing
6 // Regression test for #91949.
7 // This hanged *forever* on 1.56, fixed by #90423.
9 #![recursion_limit = "256"]
13 struct IteratorOfWrapped<T, I: Iterator<Item = T>>(I);
15 impl<T, I: Iterator<Item = T>> Iterator for IteratorOfWrapped<T, I> {
16 type Item = Wrapped<T>;
17 fn next(&mut self) -> Option<Wrapped<T>> {
18 self.0.next().map(Wrapped)
22 fn recurse<T>(elements: T) -> Vec<char>
24 T: Iterator<Item = ()>,
26 recurse(IteratorOfWrapped(elements).map(|t| t.0))
30 recurse(std::iter::empty());