1 files changed, 19 insertions, 0 deletions
diff --git a/src/test/ui/derive-uninhabited-enum-38885.rs b/src/test/ui/derive-uninhabited-enum-38885.rs
new file mode 100644
index 000000000..0089453ef
--- /dev/null
+++ b/src/test/ui/derive-uninhabited-enum-38885.rs
@@ -0,0 +1,19 @@
+// check-pass
+// compile-flags: -Wunused
+
+// ensure there are no special warnings about uninhabited types
+// when deriving Debug on an empty enum
+
+#[derive(Debug)]
+enum Void {}
+
+#[derive(Debug)]
+enum Foo {
+    Bar(u8),
+    Void(Void), //~ WARN variant `Void` is never constructed
+}
+
+fn main() {
+    let x = Foo::Bar(42);
+    println!("{:?}", x);
+}