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-rw-r--r--lib/rdoc/markup/to_table_of_contents.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rdoc/markup/to_table_of_contents.rb b/lib/rdoc/markup/to_table_of_contents.rb
index 2e0f98cfeb..eae7c59d94 100644
--- a/lib/rdoc/markup/to_table_of_contents.rb
+++ b/lib/rdoc/markup/to_table_of_contents.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
##
# Extracts just the RDoc::Markup::Heading elements from a
# RDoc::Markup::Document to help build a table of contents