expand_dependencies

# File lib/bundler/definition.rb, line 880
    def expand_dependencies(dependencies, remote = false)
      sorted_platforms = Resolver.sort_platforms(@platforms)
      deps = []
      dependencies.each do |dep|
        dep = Dependency.new(dep, ">= 0") unless dep.respond_to?(:name)
        next if !remote && !dep.current_platform?
        platforms = dep.gem_platforms(sorted_platforms)
        if platforms.empty? && !Bundler.settings[:disable_platform_warnings]
          mapped_platforms = dep.platforms.map {|p| Dependency::PLATFORM_MAP[p] }
          Bundler.ui.warn              "The dependency #{dep} will be unused by any of the platforms Bundler is installing for. "              "Bundler is installing for #{@platforms.join ", "} but the dependency "              "is only for #{mapped_platforms.join ", "}. "              "To add those platforms to the bundle, "              "run `bundle lock --add-platform #{mapped_platforms.join " "}`."
        end
        platforms.each do |p|
          deps << DepProxy.new(dep, p) if remote || p == generic_local_platform
        end
      end
      deps
    end