test/test_tsort.rb: Specify frozen_string_literal: true.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52574 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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# frozen_string_literal: true
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require 'tsort'
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require 'tsort'
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require 'test/unit'
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require 'test/unit'
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