Golang waits for a group of goroutines to complete with the return value (2)

// https://github.com/AaronJan/Hunch
ctx := context.Background()
r, err := hunch.All(
    ctx,
    func(ctx context.Context) (interface{
    }, error) {
    
        time.Sleep(300 * time.Millisecond)
        return 1, nil
    },
    func(ctx context.Context) (interface{
    }, error) {
    
        time.Sleep(200 * time.Millisecond)
        return 2, nil
    },
    func(ctx context.Context) (interface{
    }, error) {
    
        time.Sleep(100 * time.Millisecond)
        return 3, nil
    },
)

fmt.Println(r, err)
// Output 

// [1 2 3] <nil>