def initialize name, *requirements
    if Regexp === name then
      msg = ["NOTE: Dependency.new w/ a regexp is deprecated.",
             "Dependency.new called from #{Gem.location_of_caller.join(":")}"]
      warn msg.join("\n") unless Gem::Deprecate.skip
    end

    type         = Symbol === requirements.last ? requirements.pop : :runtime
    requirements = requirements.first if 1 == requirements.length # unpack

    unless TYPES.include? type
      raise ArgumentError, "Valid types are #{TYPES.inspect}, "
        + "not #{type.inspect}"
    end

    @name        = name
    @requirement = Gem::Requirement.create requirements
    @type        = type
    @prerelease  = false

    # This is for Marshal backwards compatibility. See the comments in
    # +requirement+ for the dirty details.

    @version_requirements = @requirement
  end
#
Constructs a dependency with +name+ and +requirements+. The last
argument can optionally be the dependency type, which defaults to
<tt>:runtime</tt>.