Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 28 insertions, 0 deletions

diff --git a/tests/ui/regions/regions-lub-ref-ref-rc.rs b/tests/ui/regions/regions-lub-ref-ref-rc.rs
new file mode 100644
index 000000000..96c71b084
--- /dev/null
+++ b/tests/ui/regions/regions-lub-ref-ref-rc.rs
@@ -0,0 +1,28 @@
+// run-pass
+#![allow(dead_code)]
+// Test a corner case of LUB coercion. In this case, one arm of the
+// match requires a deref coercion and the other doesn't, and there
+// is an extra `&` on the `rc`. We want to be sure that the lifetime
+// assigned to this `&rc` value is not `'a` but something smaller.  In
+// other words, the type from `rc` is `&'a Rc<String>` and the type
+// from `&rc` should be `&'x &'a Rc<String>`, where `'x` is something
+// small.
+
+use std::rc::Rc;
+
+#[derive(Clone)]
+enum Cached<'mir> {
+    Ref(&'mir String),
+    Owned(Rc<String>),
+}
+
+impl<'mir> Cached<'mir> {
+    fn get_ref<'a>(&'a self) -> &'a String {
+        match *self {
+            Cached::Ref(r) => r,
+            Cached::Owned(ref rc) => &rc,
+        }
+    }
+}
+
+fn main() { }