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: errors.go
    path of file: ./repos/rclone/lib/errors
    
    the code of the file until where you have to start completion: // Package errors provides error handling utilities.
package errors

import (
	"reflect"
)

// WalkFunc is the signature of the Walk callback function. The function gets the
// current error in the chain and should return true if the chain processing
// should be aborted.
type WalkFunc func(error) bool

// Walk invokes the given function for each error in the chain. If the
// provided functions returns true or no further cause can be found, the process
// is stopped and no further calls will be 
    
func Walk(err error, f WalkFunc) {
	for prev := err; err != nil; prev = err {
		if f(err) {
			return
		}

		switch e := err.(type) {
		case multiWrapper:
			for _, err = range e.Unwrap() {
				Walk(err, f)
			}
			return
		case causer:
			err = e.Cause()
		case wrapper:
			err = e.Unwrap()
		default:
			// Unpack any struct or *struct with a field of name Err which satisfies
			// the error interface. This includes *url.Error, *net.OpError,
			// *os.SyscallError and many others in the stdlib.
			errType := reflect.TypeOf(err)
			errValue := reflect.ValueOf(err)
			if errValue.IsValid() && errType.Kind() == reflect.Ptr {
				errType = errType.Elem()
				errValue = errValue.Elem()
			}
			if errValue.IsValid() && errType.Kind() == reflect.Struct {
				if errField := errValue.FieldByName("Err"); errField.IsValid() {
					errFieldValue := errField.Interface()
					if newErr, ok := errFieldValue.(error); ok {
						err = newErr
					}
				}
			}
		}
		if reflect.DeepEqual(err, prev) {
			break
		}
	}
}