find_gem

# File lib/rubygems/source/local.rb, line 81
  def find_gem(gem_name, version = Gem::Requirement.default, # :nodoc:
               prerelease = false)
    load_specs :complete

    found = []

    @specs.each do |n, data|
      if n.name == gem_name
        s = data[1].spec

        if version.satisfied_by?(s.version)
          if prerelease
            found << s
          elsif !s.version.prerelease? || version.prerelease?
            found << s
          end
        end
      end
    end

    found.max_by { |s| s.version }
  end