experiment to show how erro unwrapping works in go:. Playground: https://play.golang.org/p/i0KKTRKfXOR

error_unwrap.go

package main

import (
	"errors"
	"fmt"
)

func main() {
	//Wrapping the errors
	err1 := errors.New("first")
	err2 := fmt.Errorf("err2 %w", err1)
	err3 := fmt.Errorf("err3 %w", err2)

	//unwrapping the errors
	gotErr1 := fmt.Errorf("hello %w", err3)
	fmt.Println(gotErr1)
	gotErr2 := errors.Unwrap(gotErr1)
	fmt.Println(gotErr2)
	gotErr3 := errors.Unwrap(gotErr2)
	fmt.Println(gotErr3)
	gotErr4 := errors.Unwrap(gotErr3)
	fmt.Println(gotErr4)

	//Unwrapping the inner most error keeps returning the same error
	gotErr5 := errors.Unwrap(gotErr3)
	fmt.Println(gotErr5)
}