add more undefined behaviour

src/subsonic.rs

@@ -71,7 +71,8 @@ impl Client {
     pub async fn ping(&self) -> Result<(), Error> {
         let mut url = self.base_url.clone();
         url.path_segments_mut()
-            .expect("can't modify url path segments")
+            // literally can't fail
+            .unwrap_or_else(|_| unsafe { std::hint::unreachable_unchecked() })
             .extend(&["rest", "ping"]);
 
         self.client