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support multi-run for test/ruby/enc/test_regex_casefold.rb
should not mutate test data.
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@ -11,7 +11,7 @@ class TestCaseFold < Test::Unit::TestCase
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def check_downcase_properties(expected, start, *flags)
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assert_equal expected, start.downcase(*flags)
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temp = start
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temp = start.dup
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assert_equal expected, temp.downcase!(*flags)
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assert_equal expected, expected.downcase(*flags)
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temp = expected
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