stubs_for

# File lib/rubygems/specification.rb, line 841
  def self.stubs_for(name)
    if @@stubs
      @@stubs_by_name[name] || []
    else
      pattern = "#{name}-*.gemspec"
      stubs = Gem.loaded_specs.values + default_stubs(pattern) +
        installed_stubs(dirs, pattern).select { |s| Gem::Platform.match s.platform }
      stubs = uniq_by(stubs) { |stub| stub.full_name }.group_by(&:name)
      stubs.each_value { |v| _resort!(v) }

      @@stubs_by_name.merge! stubs
      @@stubs_by_name[name] ||= EMPTY
    end
  end