class Bundler::Resolver

def start(requirements)
  verify_gemfile_dependencies_are_found!(requirements)
  dg = @resolver.resolve(requirements, @base_dg)
  dg.map(&:payload).map(&:to_specs).flatten
rescue Molinillo::VersionConflict => e
  raise VersionConflict.new(e.conflicts.keys.uniq, e.message)
rescue Molinillo::CircularDependencyError => e
  names = e.dependencies.sort_by(&:name).map { |d| "gem '#{d.name}'"}
  raise CyclicDependencyError, "Your Gemfile requires gems that depend" \
    " on each other, creating an infinite loop. Please remove" \
    " #{names.count > 1 ? 'either ' : '' }#{names.join(' or ')}" \
    " and try again."
end