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--- nokogiri-1.6.6.4/./lib/nokogiri/version.rb.nowarn	2015-11-20 05:50:37.000000000 +0900
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+++ nokogiri-1.6.6.4/./lib/nokogiri/version.rb	2015-12-11 14:32:04.151973080 +0900
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@@ -34,6 +34,7 @@
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     end
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     def warnings
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+      return []
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       return [] unless libxml2?
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       if compiled_parser_version != loaded_parser_version