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How to append struct member dynamically using Empty Interface?

Example

package main

import (
	"fmt"
)

type Before struct {
	m string
}

func append(b interface{}) interface{} {
	return struct {
		Before
		n string
	}{b.(Before), "rest"}
}

func main() {
	b := Before{"test"}
	a := append(b)
	fmt.Println(a)
}
{{test} rest}
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