1 files changed, 35 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/unwrap_expect_used.rs b/src/tools/clippy/tests/ui/unwrap_expect_used.rs
new file mode 100644
index 000000000..9f27fef82
--- /dev/null
+++ b/src/tools/clippy/tests/ui/unwrap_expect_used.rs
@@ -0,0 +1,35 @@
+#![warn(clippy::unwrap_used, clippy::expect_used)]
+
+trait OptionExt {
+    type Item;
+
+    fn unwrap_err(self) -> Self::Item;
+
+    fn expect_err(self, msg: &str) -> Self::Item;
+}
+
+impl<T> OptionExt for Option<T> {
+    type Item = T;
+    fn unwrap_err(self) -> T {
+        panic!();
+    }
+
+    fn expect_err(self, msg: &str) -> T {
+        panic!();
+    }
+}
+
+fn main() {
+    Some(3).unwrap();
+    Some(3).expect("Hello world!");
+
+    // Don't trigger on unwrap_err on an option
+    Some(3).unwrap_err();
+    Some(3).expect_err("Hellow none!");
+
+    let a: Result<i32, i32> = Ok(3);
+    a.unwrap();
+    a.expect("Hello world!");
+    a.unwrap_err();
+    a.expect_err("Hello error!");
+}