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-rw-r--r--ext/tk/sample/tkextlib/bwidget/basic.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/tkextlib/bwidget/basic.rb b/ext/tk/sample/tkextlib/bwidget/basic.rb
index 060baf8a6c..6a7bdbc1f6 100644
--- a/ext/tk/sample/tkextlib/bwidget/basic.rb
+++ b/ext/tk/sample/tkextlib/bwidget/basic.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# basic demo --- called from demo.rb
#