/usr/lib/ruby/vendor_ruby/concurrent/channel/buffer.rb is in ruby-concurrent 1.0.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | require 'concurrent/channel/buffer/base'
require 'concurrent/channel/buffer/buffered'
require 'concurrent/channel/buffer/dropping'
require 'concurrent/channel/buffer/sliding'
require 'concurrent/channel/buffer/unbuffered'
require 'concurrent/channel/buffer/ticker'
require 'concurrent/channel/buffer/timer'
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