package main

import "sync"

// go run -race main.go

type Data struct {
	X int
	Y int
}

func main() {
	var data Data
	values := make([]int, 2)

	wg := sync.WaitGroup{}
	wg.Add(2)

	go func() {
		defer wg.Done()

		data.X = 5
		values[0] = 5
	}()

	go func() {
		defer wg.Done()

		data.Y = 10
		values[1] = 10
	}()

	wg.Wait()
}