/usr/lib/ruby/1.8/merb-core/core_ext.rb is in libmerb-core-ruby1.8 1.0.12+dfsg-4fakesync1.
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 10 | begin
require "extlib"
rescue LoadError => e
puts "Merb-core 0.9.4 and later uses extlib for Ruby core class extensions. Install it from github.com/sam/extlib."
exit
end
require File.dirname(__FILE__) / "core_ext" / "kernel"
require File.dirname(__FILE__) / "core_ext" / "hash"
require File.dirname(__FILE__) / "core_ext" / "class"
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