update & cargo +nightly fmt

frame/session/src/lib.rs

@@ -533,7 +533,7 @@ pub mod pallet {
 	pub enum Event {
 		/// New session has happened. Note that the argument is the session_index, not the
 		/// block number as the type might suggest.
-		NewSession { session_index: SessionIndex },
+		NewSession { index: SessionIndex },
 	}
 
 	/// Old name generated by `decl_event`.
@@ -702,7 +702,7 @@ impl<T: Config> Pallet<T> {
 		<QueuedChanged<T>>::put(next_changed);
 
 		// Record that this happened.
-		Self::deposit_event(Event::NewSession { session_index: session_index });
+		Self::deposit_event(Event::NewSession { index: session_index });
 
 		// Tell everyone about the new session keys.
 		T::SessionHandler::on_new_session::<T::Keys>(changed, &session_keys, &queued_amalgamated);