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package main

import (
	"errors"
	"fmt"
	"time"
)

func main() {
	chErr := make(chan error)
	signal := make(chan bool)

	select {
	case err := <-chErr:
		fmt.Println("found error:", err)
	default:
		fmt.Println("no found error")
	}

	go func() {
		time.Sleep(2 * time.Second)
		signal <- true
		close(signal)
	}()

	go func() {
		time.Sleep(1 * time.Second)
		chErr <- fmt.Errorf("%w", errors.New("can't continue"))
		close(chErr)
	}()

	select {
	case err := <-chErr:
		fmt.Println("found error:", err)
		break
	case sig := <-signal:
		fmt.Println("received signal", sig)
	default:
		fmt.Println("no activity")
	}
}