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-rw-r--r--lib/rdoc/mixin.rb1
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diff --git a/lib/rdoc/mixin.rb b/lib/rdoc/mixin.rb
index 547744f870..14f04c15e7 100644
--- a/lib/rdoc/mixin.rb
+++ b/lib/rdoc/mixin.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
##
# A Mixin adds features from a module into another context. RDoc::Include and
# RDoc::Extend are both mixins.