module Sass::Files

def find_full_path(filename, load_path)
  partial_name = File.join(File.dirname(filename), "_#{File.basename(filename)}")
  if Pathname.new(filename).absolute?
    [partial_name, filename].each do |name|
      return name if File.readable?(name)
    end
    return nil
  end
  [partial_name, filename].each do |name|
    full_path = File.join(load_path, name)
    return full_path if File.readable?(full_path)
  end
  nil
end