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-rw-r--r--ext/tk/sample/propagate.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/propagate.rb b/ext/tk/sample/propagate.rb
index 66f14aeb72..10e0ed8236 100644
--- a/ext/tk/sample/propagate.rb
+++ b/ext/tk/sample/propagate.rb
@@ -1,4 +1,5 @@
#!/usr/bin/env ruby
+# frozen_string_literal: false
require 'tk'
TkLabel.new(:text=>"Please click the bottom frame").pack