1 files changed, 36 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-30380.rs b/tests/ui/issues/issue-30380.rs
new file mode 100644
index 00000000000..48b329c5de1
--- /dev/null
+++ b/tests/ui/issues/issue-30380.rs
@@ -0,0 +1,36 @@
+// check that panics in destructors during assignment do not leave
+// destroyed values lying around for other destructors to observe.
+
+// run-fail
+// error-pattern:panicking destructors ftw!
+// ignore-emscripten no processes
+
+struct Observer<'a>(&'a mut FilledOnDrop);
+
+struct FilledOnDrop(u32);
+impl Drop for FilledOnDrop {
+    fn drop(&mut self) {
+        if self.0 == 0 {
+            // this is only set during the destructor - safe
+            // code should not be able to observe this.
+            self.0 = 0x1c1c1c1c;
+            panic!("panicking destructors ftw!");
+        }
+    }
+}
+
+impl<'a> Drop for Observer<'a> {
+    fn drop(&mut self) {
+        assert_eq!(self.0 .0, 1);
+    }
+}
+
+fn foo(b: &mut Observer) {
+    *b.0 = FilledOnDrop(1);
+}
+
+fn main() {
+    let mut bomb = FilledOnDrop(0);
+    let mut observer = Observer(&mut bomb);
+    foo(&mut observer);
+}