Acknowledged

bug: Cannot instantiate object of type 'PolyType'.

Both with SDK 7.4.3 and 8.0.0-Beta:

the compiler can't instantiate an object of polytype where each option is a drawable:
function draw1(dc as Dc) {
    var statusIconId = Rez.Drawables.pause;
    var statusIcon = new statusIconId(); // WARN: Cannot determine type for creation.
	statusIcon.draw(dc); // WARN: Cannot determine type for method invocation.
}

function draw2(dc as Dc, isPaused as Boolean) {
    var statusIconId = isPaused ? Rez.Drawables.pause : Rez.Drawables.stop;
    var statusIcon = new statusIconId(); // ERROR: Cannot instantiate object of type 'PolyType<$.Rez.Drawables.pause or $.Rez.Drawables.stop>'.
	statusIcon.draw(dc); // WARN: Cannot determine type for method invocation.
}
manifest.xml:
project.typecheck = 2
project.optimization = 3z
Interestingly this works (except I can't post the code...):
 
function draw3(dc as Dc, a as Boolean, b as Boolean, c as Boolean) as Void {
	var x;
	if (a) {
		if (b) {
			x = Rez.Drawables.play;
		} else {
			x = c ? Rez.Drawables.pause : Rez.Drawables.stop;
		}
	} else {
		x = null;
	}
if (x != null) {
var y = new x(); // WARN: Cannot determine type for creation
y.draw(dc); // WARN: Cannot determine type for method invocation
}
}
Oh, for F*CK sake! Please fix the forum!!!!! Why can't we post legit MC code????
Why am I wasting my time on editing and trying to post the code line by line for 30 minutes????