1 files changed, 50 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/forget_ref.rs b/src/tools/clippy/tests/ui/forget_ref.rs
new file mode 100644
index 000000000..031b415f5
--- /dev/null
+++ b/src/tools/clippy/tests/ui/forget_ref.rs
@@ -0,0 +1,50 @@
+#![warn(clippy::forget_ref)]
+#![allow(clippy::toplevel_ref_arg)]
+#![allow(clippy::unnecessary_wraps, clippy::forget_non_drop)]
+#![allow(clippy::borrow_deref_ref)]
+
+use std::mem::forget;
+
+struct SomeStruct;
+
+fn main() {
+    forget(&SomeStruct);
+
+    let mut owned = SomeStruct;
+    forget(&owned);
+    forget(&&owned);
+    forget(&mut owned);
+    forget(owned); //OK
+
+    let reference1 = &SomeStruct;
+    forget(&*reference1);
+
+    let reference2 = &mut SomeStruct;
+    forget(reference2);
+
+    let ref reference3 = SomeStruct;
+    forget(reference3);
+}
+
+#[allow(dead_code)]
+fn test_generic_fn_forget<T>(val: T) {
+    forget(&val);
+    forget(val); //OK
+}
+
+#[allow(dead_code)]
+fn test_similarly_named_function() {
+    fn forget<T>(_val: T) {}
+    forget(&SomeStruct); //OK; call to unrelated function which happens to have the same name
+    std::mem::forget(&SomeStruct);
+}
+
+#[derive(Copy, Clone)]
+pub struct Error;
+fn produce_half_owl_error() -> Result<(), Error> {
+    Ok(())
+}
+
+fn produce_half_owl_ok() -> Result<bool, ()> {
+    Ok(true)
+}