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-rw-r--r--ext/tk/sample/tkextlib/bwidget/tree.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/ext/tk/sample/tkextlib/bwidget/tree.rb b/ext/tk/sample/tkextlib/bwidget/tree.rb
index 0d9fc38050..9bfa4f3ccf 100644
--- a/ext/tk/sample/tkextlib/bwidget/tree.rb
+++ b/ext/tk/sample/tkextlib/bwidget/tree.rb
@@ -1,6 +1,9 @@
#
# templdlg demo --- called from demo.rb
#
+unless Object.const_defined?('DemoVar')
+ fail RuntimeError, "This is NOT a stand alone script. This script is called from 'demo.rb'. "
+end
module DemoTree
@@count = 0