1 files changed, 16 insertions, 0 deletions
diff --git a/src/test/ui/union/union-derive.rs b/src/test/ui/union/union-derive.rs
new file mode 100644
index 000000000..652a6b24c
--- /dev/null
+++ b/src/test/ui/union/union-derive.rs
@@ -0,0 +1,16 @@
+// Most traits cannot be derived for unions.
+
+#[derive(
+    PartialEq, //~ ERROR this trait cannot be derived for unions
+    PartialOrd, //~ ERROR this trait cannot be derived for unions
+    Ord, //~ ERROR this trait cannot be derived for unions
+    Hash, //~ ERROR this trait cannot be derived for unions
+    Default, //~ ERROR this trait cannot be derived for unions
+    Debug, //~ ERROR this trait cannot be derived for unions
+)]
+union U {
+    a: u8,
+    b: u16,
+}
+
+fn main() {}