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-rw-r--r--ext/tk/sample/tcltklib/lines4.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/tcltklib/lines4.rb b/ext/tk/sample/tcltklib/lines4.rb
index 7a1175bce0..37ffc0ee74 100644
--- a/ext/tk/sample/tcltklib/lines4.rb
+++ b/ext/tk/sample/tcltklib/lines4.rb
@@ -1,4 +1,5 @@
#! /usr/local/bin/ruby
+# frozen_string_literal: false
require "tk"