Compiling this with experimental non-null enabled:

void main () {
	var array = new Variant.parsed ("[1, 2, 3]");

	foreach (var item in array) {
		print ("%d", item.get_int32 ());
	}
}

Results in:

fail.vala:5.16-5.29: error: Access to instance member `GLib.Variant.get_int32' from nullable reference denied
		print ("%d", item.get_int32 ());
		             ^^^^^^^^^^^^^^
Compilation failed: 1 error(s), 0 warning(s)

But it shouldn't be necessary since item can't be null. The iterator interface stops when next_value() returns null, and get() returns T, not T?.