1 files changed, 28 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/let_underscore_drop.rs b/src/tools/clippy/tests/ui/let_underscore_drop.rs
new file mode 100644
index 000000000..11b50492a
--- /dev/null
+++ b/src/tools/clippy/tests/ui/let_underscore_drop.rs
@@ -0,0 +1,28 @@
+#![warn(clippy::let_underscore_drop)]
+#![allow(clippy::let_unit_value)]
+
+struct Droppable;
+
+impl Drop for Droppable {
+    fn drop(&mut self) {}
+}
+
+fn main() {
+    let unit = ();
+    let boxed = Box::new(());
+    let droppable = Droppable;
+    let optional = Some(Droppable);
+
+    let _ = ();
+    let _ = Box::new(());
+    let _ = Droppable;
+    let _ = Some(Droppable);
+
+    // no lint for reference
+    let _ = droppable_ref();
+}
+
+#[must_use]
+fn droppable_ref() -> &'static mut Droppable {
+    unimplemented!()
+}