/usr/lib/ruby/vendor_ruby/active_support/core_ext/object/acts_like.rb is in ruby-activesupport 2:4.2.6-1.
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 | class Object
# A duck-type assistant method. For example, Active Support extends Date
# to define an <tt>acts_like_date?</tt> method, and extends Time to define
# <tt>acts_like_time?</tt>. As a result, we can do <tt>x.acts_like?(:time)</tt> and
# <tt>x.acts_like?(:date)</tt> to do duck-type-safe comparisons, since classes that
# we want to act like Time simply need to define an <tt>acts_like_time?</tt> method.
def acts_like?(duck)
respond_to? :"acts_like_#{duck}?"
end
end
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