1 files changed, 28 insertions, 0 deletions
diff --git a/src/test/ui/nll/issue-55651.rs b/src/test/ui/nll/issue-55651.rs
new file mode 100644
index 000000000..75ba48271
--- /dev/null
+++ b/src/test/ui/nll/issue-55651.rs
@@ -0,0 +1,28 @@
+// check-pass
+
+use std::mem::ManuallyDrop;
+
+struct A;
+struct B;
+
+union U {
+    a: ManuallyDrop<A>,
+    b: ManuallyDrop<B>,
+}
+
+fn main() {
+    unsafe {
+        {
+            let mut u = U { a: ManuallyDrop::new(A) };
+            let a = u.a;
+            u.a = ManuallyDrop::new(A);
+            let a = u.a; // OK
+        }
+        {
+            let mut u = U { a: ManuallyDrop::new(A) };
+            let a = u.a;
+            u.b = ManuallyDrop::new(B);
+            let a = u.a; // OK
+        }
+    }
+}