* lisp/play/tetris.el: Use lexical-binding.

diff --git a/lisp/play/tetris.el b/lisp/play/tetris.el
index 97979b5b6b64aae38b8c2739f1e969ed3bff1abc..e25cacbb722669173c9c06e8ae80acbb1521d4b2 100644 (file)
--- a/lisp/play/tetris.el
+++ b/lisp/play/tetris.el
@@ -1,4 +1,4 @@
-;;; tetris.el --- implementation of Tetris for Emacs
+;;; tetris.el --- implementation of Tetris for Emacs  -*- lexical-binding:t -*-
 
 ;; Copyright (C) 1997, 2001-2020 Free Software Foundation, Inc.