You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: desc.go
    path of file: ./repos/plik/vendor/google.golang.org/protobuf/reflect/protodesc
    
    the code of the file until where you have to start completion: // Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package protodesc provides functionality for converting
// FileDescriptorProto messages to/from protoreflect.FileDescriptor values.
//
// The google.protobuf.FileDescriptorProto is a protobuf message that describes
// the type information for a .proto file in a form that 
    
func (o FileOptions) addFileDeps(r *protoregistry.Files, fd *descriptorpb.FileDescriptorProto, files map[string]*descriptorpb.FileDescriptorProto) error {
	// Set the entry to nil while descending into a file's dependencies to detect cycles.
	files[fd.GetName()] = nil
	for _, dep := range fd.Dependency {
		depfd, ok := files[dep]
		if depfd == nil {
			if ok {
				return errors.New("import cycle in file: %q", dep)
			}
			continue
		}
		if err := o.addFileDeps(r, depfd, files); err != nil {
			return err
		}
	}
	// Delete the entry once dependencies are processed.
	delete(files, fd.GetName())
	f, err := o.New(fd, r)
	if err != nil {
		return err
	}
	return r.RegisterFile(f)
}