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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:02:58 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:02:58 +0000
commit698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch)
tree173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/traits/issue-91949-hangs-on-recursion.rs
parentInitial commit. (diff)
downloadrustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz
rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--src/test/ui/traits/issue-91949-hangs-on-recursion.rs31
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());
+}