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-rw-r--r--lib/rdoc/markup/rule.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rdoc/markup/rule.rb b/lib/rdoc/markup/rule.rb
index b778f2bc09..b96d4fb293 100644
--- a/lib/rdoc/markup/rule.rb
+++ b/lib/rdoc/markup/rule.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
##
# A horizontal rule with a weight