verify_gemfile_dependencies_are_found!

# File lib/bundler/resolver.rb, line 254
    def verify_gemfile_dependencies_are_found!(requirements)
      requirements.each do |requirement|
        name = requirement.name
        next if name == "bundler"
        next unless search_for(requirement).empty?

        cache_message = begin
                            " or in gems cached in #{Bundler.settings.app_cache_path}" if Bundler.app_cache.exist?
                          rescue GemfileNotFound
                            nil
                          end

        if (base = @base[name]) && !base.empty?
          version = base.first.version
          message = "You have requested:\n"              "  #{name} #{requirement.requirement}\n\n"              "The bundle currently has #{name} locked at #{version}.\n"              "Try running `bundle update #{name}`\n\n"              "If you are updating multiple gems in your Gemfile at once,\n"              "try passing them all to `bundle update`"
        elsif source = @source_requirements[name]
          specs = source.specs[name]
          versions_with_platforms = specs.map {|s| [s.version, s.platform] }
          message = String.new("Could not find gem '#{SharedHelpers.pretty_dependency(requirement)}' in #{source}#{cache_message}.\n")
          message << if versions_with_platforms.any?
                       "The source contains '#{name}' at: #{formatted_versions_with_platforms(versions_with_platforms)}"
                     else
                       "The source does not contain any versions of '#{name}'"
                     end
        else
          message = "Could not find gem '#{requirement}' in any of the gem sources "              "listed in your Gemfile#{cache_message}."
        end
        raise GemNotFound, message
      end
    end