/usr/lib/ruby/1.8/compass/installers.rb is in libcompass-ruby1.8 0.10.6~dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | %w(manifest template_context base manifest_installer bare_installer).each do |f|
require "compass/installers/#{f}"
end
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