case *ast.TypeSpec:
				if isDeprecated(n.Doc) {
					mark(n.Name)
				}
				return true // recurse into struct or interface type
			case *ast.StructType:
				return true // recurse into fields
			case *ast.InterfaceType:
				return true // recurse into methods
			case *ast.FieldList:
				return true // recurse into fields
			case *ast.ValueSpec:
				if isDeprecated(n.Doc) {
					for _, id := range n.Names {

	var readers []local.ReaderSource

	err := filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}
		// If we encounter a directory, recurse only if the --recursive option
		// was provided and the directory is not the same as dir.
		if info.IsDir() {
			if !recursive && dir != path {
				return filepath.SkipDir
			}
			return nil
		}