/usr/lib/ruby/vendor_ruby/insist/nil.rb is in ruby-insist 1.0.0-1.
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 | module Insist::Nil
# Assert nil
def nil?
assert(value.nil?, "Expected nil, got #{@value.inspect}")
end # def nil?
end # module Insist::Nil
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