/usr/lib/ruby/vendor_ruby/active_support/core_ext/kernel/singleton_class.rb is in ruby-activesupport-3.2 3.2.16-2.
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 11 12 13 | module Kernel
# Returns the object's singleton class.
def singleton_class
class << self
self
end
end unless respond_to?(:singleton_class) # exists in 1.9.2
# class_eval on an object acts like singleton_class.class_eval.
def class_eval(*args, &block)
singleton_class.class_eval(*args, &block)
end
end
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