/usr/lib/ruby/vendor_ruby/merb-core/tasks/merb.rb is in ruby-merb-core 1.1.3+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | Dir[File.dirname(__FILE__) / '*.rake'].each { |ext| load ext }
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