Impl clone method (#3)

errors.go

@@ -211,6 +211,14 @@ func (x *Error) ID(id string) *Error {
 	return x
 }
 
+// Clone creates a new error extends receiver error's info
+// No side effect to receiver
+func (x *Error) Clone() *Error {
+	err := newError()
+	x.copy(err)
+	return err
+}
+
 // Wrap creates a new Error and copy message and id to new one.
 func (x *Error) Wrap(cause error) *Error {
 	err := newError()

examples/logging_with_zap/main.go

@@ -28,11 +28,20 @@ func main() {
 		},
 	}
 
-	err := goerr.Wrap(errors.New("some error")).WithValue("key", "value").WithValue("num_key", 1).WithValue("struct", st)
+	err := goerr.Wrap(errors.New("some error")).
+		WithValue("key", "value").
+		WithValue("num_key", 1).
+		WithValue("struct", st)
 
 	if goErr := goerr.Unwrap(err); goErr != nil {
 		log.Printf("%s\n", goErr.LogValue())
 	}
 
 	logger.Error("something happening", zap.Object("error", err))
+
+	if goErr := goerr.Unwrap(err); goErr != nil {
+		err2 := goErr.Clone()
+		err2 = err2.WithValue("___2", "This is err2")
+		logger.Error("something happening2", zap.Object("error2", err2))
+	}
 }