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-rw-r--r--src/test/ui/nll/issue-55651.rs28
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
+ }
+ }
+}