1 files changed, 31 insertions, 0 deletions
diff --git a/tests/ui/union/union-with-drop-fields.rs b/tests/ui/union/union-with-drop-fields.rs
new file mode 100644
index 00000000000..a7a8b69e784
--- /dev/null
+++ b/tests/ui/union/union-with-drop-fields.rs
@@ -0,0 +1,31 @@
+// revisions: mirunsafeck thirunsafeck
+// [thirunsafeck]compile-flags: -Z thir-unsafeck
+
+#![allow(dead_code)]
+
+union U {
+    a: u8, // OK
+}
+
+union W {
+    a: String, //~ ERROR unions cannot contain fields that may need dropping
+    b: String, // OK, only one field is reported
+}
+
+struct S(String);
+
+// `S` doesn't implement `Drop` trait, but still has non-trivial destructor
+union Y {
+    a: S, //~ ERROR unions cannot contain fields that may need dropping
+}
+
+// We don't know if `T` is trivially-destructable or not until trans
+union J<T> {
+    a: T, //~ ERROR unions cannot contain fields that may need dropping
+}
+
+union H<T: Copy> {
+    a: T, // OK, `T` is `Copy`, no destructor
+}
+
+fn main() {}