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-rw-r--r--ext/tk/sample/tksleep_sample.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/tksleep_sample.rb b/ext/tk/sample/tksleep_sample.rb
index 23f6eca54e..14ce3a475f 100644
--- a/ext/tk/sample/tksleep_sample.rb
+++ b/ext/tk/sample/tksleep_sample.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'tk'
v = TkVariable.new(0)