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: errdesc.go
    path of file: ./repos/moby/vendor/github.com/containerd/containerd/remotes/docker
    
    the code of the file until where you have to start completion: /*
   Copyright The containerd Authors.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the Lice
    
func Register(group string, descriptor ErrorDescriptor) ErrorCode {
	registerLock.Lock()
	defer registerLock.Unlock()

	descriptor.Code = ErrorCode(nextCode)

	if _, ok := idToDescriptors[descriptor.Value]; ok {
		panic(fmt.Sprintf("ErrorValue %q is already registered", descriptor.Value))
	}
	if _, ok := errorCodeToDescriptors[descriptor.Code]; ok {
		panic(fmt.Sprintf("ErrorCode %v is already registered", descriptor.Code))
	}

	groupToDescriptors[group] = append(groupToDescriptors[group], descriptor)
	errorCodeToDescriptors[descriptor.Code] = descriptor
	idToDescriptors[descriptor.Value] = descriptor

	nextCode++
	return descriptor.Code
}