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-rw-r--r--test/ruby/marshaltestlib.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/ruby/marshaltestlib.rb b/test/ruby/marshaltestlib.rb
index 665d365a9a..358d3c5133 100644
--- a/test/ruby/marshaltestlib.rb
+++ b/test/ruby/marshaltestlib.rb
@@ -1,4 +1,5 @@
# coding: utf-8
+# frozen_string_literal: false
module MarshalTestLib
# include this module to a Test::Unit::TestCase and define encode(o) and
# decode(s) methods. e.g.