1 files changed, 44 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/vtable_address_comparisons.rs b/src/tools/clippy/tests/ui/vtable_address_comparisons.rs
new file mode 100644
index 000000000..a9a4a0f5a
--- /dev/null
+++ b/src/tools/clippy/tests/ui/vtable_address_comparisons.rs
@@ -0,0 +1,44 @@
+use std::fmt::Debug;
+use std::ptr;
+use std::rc::Rc;
+use std::sync::Arc;
+
+#[warn(clippy::vtable_address_comparisons)]
+#[allow(clippy::borrow_as_ptr)]
+
+fn main() {
+    let a: *const dyn Debug = &1 as &dyn Debug;
+    let b: *const dyn Debug = &1 as &dyn Debug;
+
+    // These should fail:
+    let _ = a == b;
+    let _ = a != b;
+    let _ = a < b;
+    let _ = a <= b;
+    let _ = a > b;
+    let _ = a >= b;
+    ptr::eq(a, b);
+
+    let a = &1 as &dyn Debug;
+    let b = &1 as &dyn Debug;
+    ptr::eq(a, b);
+
+    let a: Rc<dyn Debug> = Rc::new(1);
+    Rc::ptr_eq(&a, &a);
+
+    let a: Arc<dyn Debug> = Arc::new(1);
+    Arc::ptr_eq(&a, &a);
+
+    // These should be fine:
+    let a = &1;
+    ptr::eq(a, a);
+
+    let a = Rc::new(1);
+    Rc::ptr_eq(&a, &a);
+
+    let a = Arc::new(1);
+    Arc::ptr_eq(&a, &a);
+
+    let a: &[u8] = b"";
+    ptr::eq(a, a);
+}