1 files changed, 14 insertions, 0 deletions
diff --git a/src/test/ui/union/union-copy.rs b/src/test/ui/union/union-copy.rs
new file mode 100644
index 000000000..5c3f8d908
--- /dev/null
+++ b/src/test/ui/union/union-copy.rs
@@ -0,0 +1,14 @@
+#[derive(Clone)]
+union U {
+    a: u8
+}
+
+#[derive(Clone)]
+union W {
+    a: std::mem::ManuallyDrop<String>
+}
+
+impl Copy for U {} // OK
+impl Copy for W {} //~ ERROR the trait `Copy` may not be implemented for this type
+
+fn main() {}