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-rw-r--r--ext/tk/sample/cmd_res_test.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/cmd_res_test.rb b/ext/tk/sample/cmd_res_test.rb
index 8df2e61af7..52c5bc7515 100644
--- a/ext/tk/sample/cmd_res_test.rb
+++ b/ext/tk/sample/cmd_res_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'tk'
TkOptionDB.readfile(File.expand_path('cmd_resource',
File.dirname(__FILE__)))