go_native_wrap_multiple_errors.go

// https://go.dev/play/p/0bbwnZYMKSa
// go@v1.19 does not recognize two wrapped errors
// go@v1.20 recognizes two wrapped errors
package main

import (
	"errors"
	"fmt"
)

var (
	Err404 = errors.New("404")
	Err500 = errors.New("500")
	ErrAll = fmt.Errorf("two wrap: %w (%w)", Err404, Err500)
)

func t(err error) {
	if errors.Is(err, Err404) {
		fmt.Println(err, "404")
	}
	if errors.Is(err, Err500) {
		fmt.Println(err, "500")
	}
}

func main() {
	t(Err404)
	t(fmt.Errorf("one wrap: %w", Err404))
	t(ErrAll)
}