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-rw-r--r--lib/rdoc/ruby_lex.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rdoc/ruby_lex.rb b/lib/rdoc/ruby_lex.rb
index 91b90ab2cf..e772e660e0 100644
--- a/lib/rdoc/ruby_lex.rb
+++ b/lib/rdoc/ruby_lex.rb
@@ -1,4 +1,5 @@
# coding: US-ASCII
+# frozen_string_literal: false
#--
# irb/ruby-lex.rb - ruby lexcal analyzer