Fixed #1937 AS3 - declarations vs null

libsrc/ffdec_lib/testdata/as3_new/src/tests/TestDeclarationInterface.as

@@ -0,0 +1,34 @@
+package tests
+{
+	
+	public class TestDeclarationInterface
+	{
+		public function run(): MyIFace
+		{
+			var i:MyIFace = null;
+			var n:int = 2;
+			switch(n) {
+				case 0:
+					i = new MyClass();
+					break;
+				case 1:
+					i = new MyClass2();
+					break;
+			}
+			return i;
+		}
+	}
+}
+
+
+interface MyIFace {
+	
+}
+
+class MyClass implements MyIFace {
+	
+}
+
+class MyClass2 implements MyIFace {
+	
+}