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-rw-r--r--lib/rdoc/parser/ruby_tools.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rdoc/parser/ruby_tools.rb b/lib/rdoc/parser/ruby_tools.rb
index 654431ea30..bbca065b5e 100644
--- a/lib/rdoc/parser/ruby_tools.rb
+++ b/lib/rdoc/parser/ruby_tools.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
##
# Collection of methods for writing parsers against RDoc::RubyLex and
# RDoc::RubyToken