1 files changed, 15 insertions, 0 deletions
diff --git a/tests/rustdoc-js/auxiliary/equivalent.rs b/tests/rustdoc-js/auxiliary/equivalent.rs
new file mode 100644
index 000000000..a19b5a2d4
--- /dev/null
+++ b/tests/rustdoc-js/auxiliary/equivalent.rs
@@ -0,0 +1,15 @@
+use std::borrow::Borrow;
+
+pub trait Equivalent<K: ?Sized> {
+    fn equivalent(&self, key: &K) -> bool;
+}
+
+impl<Q: ?Sized, K: ?Sized> Equivalent<K> for Q
+where
+    Q: Eq,
+    K: Borrow<Q>,
+{
+    fn equivalent(&self, key: &K) -> bool {
+        PartialEq::eq(self, key.borrow())
+    }
+}