1 files changed, 28 insertions, 0 deletions
diff --git a/tests/ui/union/union-backcomp.rs b/tests/ui/union/union-backcomp.rs
new file mode 100644
index 00000000000..b19eab9f52b
--- /dev/null
+++ b/tests/ui/union/union-backcomp.rs
@@ -0,0 +1,28 @@
+// run-pass
+// revisions: mirunsafeck thirunsafeck
+// [thirunsafeck]compile-flags: -Z thir-unsafeck
+
+#![allow(path_statements)]
+#![allow(dead_code)]
+
+macro_rules! union {
+    () => (struct S;)
+}
+
+union!();
+
+fn union() {}
+
+fn main() {
+    union();
+
+    let union = 10;
+
+    union;
+
+    union as u8;
+
+    union U {
+        a: u8,
+    }
+}