latest_spec_for

# File lib/rubygems.rb, line 931
  def self.latest_spec_for name
    dependency  = Gem::Dependency.new name
    fetcher     = Gem::SpecFetcher.fetcher
    spec_tuples = fetcher.find_matching dependency

    match = spec_tuples.select { |(n, _, p), _|
      n == name and Gem::Platform.match p
    }.sort_by { |(_, version, _), _|
      version
    }.last

    match and fetcher.fetch_spec(*match)
  end