# File lib/bundler/dependency.rb, line 71
    def to_lock
      out = "  #{name}"

      unless requirement == Gem::Requirement.default
        reqs = requirement.requirements.map{|o,v| "#{o} #{v}" }
        out << " (#{reqs.join(', ')})"
      end

      out << '!' if source

      out << "\n"
    end