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-rw-r--r--lib/rdoc/markup/formatter.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rdoc/markup/formatter.rb b/lib/rdoc/markup/formatter.rb
index 7661c95239..197ff003e3 100644
--- a/lib/rdoc/markup/formatter.rb
+++ b/lib/rdoc/markup/formatter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
##
# Base class for RDoc markup formatters
#