1 files changed, 44 insertions, 0 deletions
diff --git a/tests/ui/union/union-manuallydrop-rpass.rs b/tests/ui/union/union-manuallydrop-rpass.rs
new file mode 100644
index 000000000..826bdf07c
--- /dev/null
+++ b/tests/ui/union/union-manuallydrop-rpass.rs
@@ -0,0 +1,44 @@
+// run-pass
+// revisions: mirunsafeck thirunsafeck
+// [thirunsafeck]compile-flags: -Z thir-unsafeck
+
+#![allow(dead_code)]
+
+use std::mem::needs_drop;
+use std::mem::ManuallyDrop;
+
+struct NeedDrop;
+
+impl Drop for NeedDrop {
+    fn drop(&mut self) {}
+}
+
+union UnionOk1<T> {
+    empty: (),
+    value: ManuallyDrop<T>,
+}
+
+union UnionOk2 {
+    value: ManuallyDrop<NeedDrop>,
+}
+
+#[allow(dead_code)]
+union UnionOk3<T: Copy> {
+    empty: (),
+    value: T,
+}
+
+trait Foo { }
+
+trait ImpliesCopy : Copy { }
+
+#[allow(dead_code)]
+union UnionOk4<T: ImpliesCopy> {
+    value: T,
+}
+
+fn main() {
+    // NeedDrop should not make needs_drop true
+    assert!(!needs_drop::<UnionOk1<NeedDrop>>());
+    assert!(!needs_drop::<UnionOk3<&dyn Foo>>());
+}