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-rw-r--r--ext/tk/sample/tktimer.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/tktimer.rb b/ext/tk/sample/tktimer.rb
index b1adb5b506..4b6abae7e6 100644
--- a/ext/tk/sample/tktimer.rb
+++ b/ext/tk/sample/tktimer.rb
@@ -1,4 +1,5 @@
#!/usr/bin/env ruby
+# frozen_string_literal: false
# This script generates a counter with start and stop buttons.
require "tk"