Go:sync

// Go calls f in a new goroutine and adds that task to the [WaitGroup].
// When f returns, the task is removed from the WaitGroup.
//
// The function f must not panic.
//
// If the WaitGroup is empty, Go must happen before a [WaitGroup.Wait].
// Typically, this simply means Go is called to start tasks before Wait is called.
// If the WaitGroup is not empty, Go may happen at any time.
// This means a goroutine started by Go may itself call Go.
// If a WaitGroup is reused to wait for several independent sets of tasks,
// new Go calls must happen after all previous Wait calls have returned.
//
// In the terminology of [the Go memory model], the return from f
// "synchronizes before" the return of any Wait call that it unblocks.
//
// [the Go memory model]: https://go.dev/ref/mem
func (wg *WaitGroup) Go(f func()) {
    wg.Add(1)
    go func() {
        defer wg.Done()
        f()
    }()
}