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: properties.go
    path of file: ./repos/teller/vendor/github.com/gogo/protobuf/proto
    
    the code of the file until where you have to start completion: // Protocol Buffers for Go with Gadgets
//
// Copyright (c) 2013, The GoGo Authors. All rights reserved.
// http://github.com/gogo/protobuf
//
// Go support for Protocol Buffers - Google's data interchange format
//
// Copyright 2010 The Go Authors.  All rights reserved.
// https://github.com/golang/protobuf
//
// Redistribution and use in source and binar
    
func RegisterType(x Message, name string) {
	if _, ok := protoTypedNils[name]; ok {
		// TODO: Some day, make this a panic.
		log.Printf("proto: duplicate proto type registered: %s", name)
		return
	}
	t := reflect.TypeOf(x)
	if v := reflect.ValueOf(x); v.Kind() == reflect.Ptr && v.Pointer() == 0 {
		// Generated code always calls RegisterType with nil x.
		// This check is just for extra safety.
		protoTypedNils[name] = x
	} else {
		protoTypedNils[name] = reflect.Zero(t).Interface().(Message)
	}
	revProtoTypes[t] = name
}