1 files changed, 39 insertions, 0 deletions
diff --git a/src/test/ui/union/union-derive-clone.rs b/src/test/ui/union/union-derive-clone.rs
new file mode 100644
index 000000000..7aa62146e
--- /dev/null
+++ b/src/test/ui/union/union-derive-clone.rs
@@ -0,0 +1,39 @@
+// revisions: mirunsafeck thirunsafeck
+// [thirunsafeck]compile-flags: -Z thir-unsafeck
+
+use std::mem::ManuallyDrop;
+
+#[derive(Clone)] //~ ERROR the trait bound `U1: Copy` is not satisfied
+union U1 {
+    a: u8,
+}
+
+#[derive(Clone)]
+union U2 {
+    a: u8, // OK
+}
+
+impl Copy for U2 {}
+
+#[derive(Clone, Copy)]
+union U3 {
+    a: u8, // OK
+}
+
+#[derive(Clone, Copy)]
+union U4<T: Copy> {
+    a: T, // OK
+}
+
+#[derive(Clone, Copy)]
+union U5<T> {
+    a: ManuallyDrop<T>, // OK
+}
+
+#[derive(Clone)]
+struct CloneNoCopy;
+
+fn main() {
+    let u = U5 { a: ManuallyDrop::new(CloneNoCopy) };
+    let w = u.clone(); //~ ERROR the method
+}