diff options
Diffstat (limited to 'src/test/ui/traits/issue-91949-hangs-on-recursion.rs')
-rw-r--r-- | src/test/ui/traits/issue-91949-hangs-on-recursion.rs | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/test/ui/traits/issue-91949-hangs-on-recursion.rs b/src/test/ui/traits/issue-91949-hangs-on-recursion.rs new file mode 100644 index 000000000..499a64f28 --- /dev/null +++ b/src/test/ui/traits/issue-91949-hangs-on-recursion.rs @@ -0,0 +1,31 @@ +// build-fail +// compile-flags: -Zinline-mir=no +// error-pattern: overflow evaluating the requirement `(): Sized` +// error-pattern: function cannot return without recursing + +// Regression test for #91949. +// This hanged *forever* on 1.56, fixed by #90423. + +#![recursion_limit = "256"] + +struct Wrapped<T>(T); + +struct IteratorOfWrapped<T, I: Iterator<Item = T>>(I); + +impl<T, I: Iterator<Item = T>> Iterator for IteratorOfWrapped<T, I> { + type Item = Wrapped<T>; + fn next(&mut self) -> Option<Wrapped<T>> { + self.0.next().map(Wrapped) + } +} + +fn recurse<T>(elements: T) -> Vec<char> +where + T: Iterator<Item = ()>, +{ + recurse(IteratorOfWrapped(elements).map(|t| t.0)) +} + +fn main() { + recurse(std::iter::empty()); +} |