RubyKaigi 2019 https://rubykaigi.org/2019/presentations/yukihiro_matz.html#apr18
[JA][Keynote] The Year of Concurrency / Yukihiro "Matz" Matsumoto @yukihiro_matz
テクノロジーRubyKaigi 2019 https://rubykaigi.org/2019/presentations/yukihiro_matz.html#apr18
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