interface Test1 {
	function test1_fnc():Void;
}

class Test2 implements Test1 {
	function test1_fnc():Void {
		trace('test1_fnc');		
	}
	function test2_fnc():Void {
		trace('test2_fnc');
	}
}

class Test3 {
	// function test3_fnc(param_obj:Test1) {
	function test3_fnc(param_obj:Test2) {
		param_obj.test1_fnc();
		param_obj.test2_fnc();
	}
}

import Test1;
import Test2;
import Test3;

// var test2_obj:Test1 = new Test2();
var test2_obj:Test2 = new Test2();
var test3_obj = new Test3();
test3_obj.test3_fnc(test2_obj);