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-rw-r--r--lib/rdoc/generator/markup.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rdoc/generator/markup.rb b/lib/rdoc/generator/markup.rb
index 788e5a485d..3ca423bb69 100644
--- a/lib/rdoc/generator/markup.rb
+++ b/lib/rdoc/generator/markup.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
##
# Handle common RDoc::Markup tasks for various CodeObjects
#