mac系統下面調用brew報錯core_ext/kernel_require.rb:55:in `require': cannot load such file

mac系統下面調用brew報錯，如下所示： /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.3.7/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- concurrent/synchroniz

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