1 files changed, 28 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/double_must_use.rs b/src/tools/clippy/tests/ui/double_must_use.rs
new file mode 100644
index 000000000..05e087b08
--- /dev/null
+++ b/src/tools/clippy/tests/ui/double_must_use.rs
@@ -0,0 +1,28 @@
+#![warn(clippy::double_must_use)]
+#![allow(clippy::result_unit_err)]
+
+#[must_use]
+pub fn must_use_result() -> Result<(), ()> {
+    unimplemented!();
+}
+
+#[must_use]
+pub fn must_use_tuple() -> (Result<(), ()>, u8) {
+    unimplemented!();
+}
+
+#[must_use]
+pub fn must_use_array() -> [Result<(), ()>; 1] {
+    unimplemented!();
+}
+
+#[must_use = "With note"]
+pub fn must_use_with_note() -> Result<(), ()> {
+    unimplemented!();
+}
+
+fn main() {
+    must_use_result();
+    must_use_tuple();
+    must_use_with_note();
+}