goroutines.go won't build

[mark-summerfield]

On both Ubuntu 22.04 and Debian 11 running Go 1.19 from the binary installer, the goroutines.go fails to build:

# gtk-examples/goroutines
./goroutines.go:70:14: assignment mismatch: 2 variables but glib.IdleAdd returns 1 value
./goroutines.go:70:45: too many arguments in call to glib.IdleAdd
	have (func(label *gtk.Label, text string) bool, *gtk.Label, string)
	want (interface{})
./goroutines.go:76:13: assignment mismatch: 2 variables but glib.IdleAdd returns 1 value
./goroutines.go:76:47: too many arguments in call to glib.IdleAdd
	have (func(str string), string)
	want (interface{})

If fixed this by changing the anonymous goroutine as follows:

	go func() {
		for {
			time.Sleep(time.Second)
			s := fmt.Sprintf("Set a label %d time(s)!", nSets)
			handle := glib.IdleAdd(func() bool {
				return LabelSetTextIdle(topLabel, s)
			})
			log.Printf("IdleAdd() #1 handle=%T %v\n", handle, handle)
			nSets++
			s = fmt.Sprintf("Set a label %d time(s)!", nSets)
			handle = glib.IdleAdd(func() bool {
				bottomLabel.SetText(s)
				return false
			})
			log.Printf("IdleAdd() #2 handle=%T %v\n", handle, handle)
			nSets++
		}
	}()

The returned value is a "SourceHandle"; I don't know that that is or means since I'm only just starting with Go/Gtk.