find_all

# File lib/rubygems/resolver/installer_set.rb, line 115
  def find_all req
    res = []

    dep  = req.dependency

    return res if @ignore_dependencies and
              @always_install.none? { |spec| dep.match? spec }

    name = dep.name

    dep.matching_specs.each do |gemspec|
      next if @always_install.any? { |spec| spec.name == gemspec.name }

      res << Gem::Resolver::InstalledSpecification.new(self, gemspec)
    end unless @ignore_installed

    if consider_local? then
      matching_local = @local.values.select do |spec, _|
        req.match? spec
      end.map do |spec, source|
        Gem::Resolver::LocalSpecification.new self, spec, source
      end

      res.concat matching_local

      begin
        if local_spec = @local_source.find_gem(name, dep.requirement) then
          res << Gem::Resolver::IndexSpecification.new(
            self, local_spec.name, local_spec.version,
            @local_source, local_spec.platform)
        end
      rescue Gem::Package::FormatError
        # ignore
      end
    end

    res.delete_if do |spec|
      spec.version.prerelease? and not dep.prerelease?
    end

    res.concat @remote_set.find_all req if consider_remote?

    res
  end