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: doc.go
    path of file: ./repos/mergo
    
    the code of the file until where you have to start completion: // Copyright 2013 Dario Castañé. All rights reserved.
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code
    
	func (t timeTransformer) Transformer(typ reflect.Type) func(dst, src reflect.Value) error {
		if typ == reflect.TypeOf(time.Time{}) {
			return func(dst, src reflect.Value) error {
				if dst.CanSet() {
					isZero := dst.MethodByName("IsZero")
					result := isZero.Call([]reflect.Value{})
					if result[0].Bool() {
						dst.Set(src)
					}
				}
				return nil
			}
		}
		return nil
	}