combine @:forward with @:read/@:prop

Main.hx

package ;
import tink.lang.Cls;

class X implements Cls { 
	@:read var msg:String = _; 
}
class Y implements Cls { 
	@:forward @:read var x:X = _;
}
class Main {
	static function main() {
		var y = new Y(new X('foo'));
		trace(y.x);
		trace([y.x, y.msg]);		
	}
}