introduce variable: use right expression if left ref is unresolved (IDEA-72914)

java/java-tests/testData/refactoring/introduceVariable/AssignmentToUnresolvedReference.java

@@ -0,0 +1,14 @@
+import java.util.*;
+
+public class Test<T>
+{
+        List<Collection<T>> getList ()
+        {
+                return new ArrayList<Collection<T>> ();
+        }
+
+        public void test2 (Test<?> arg)
+        {
+                res<caret>ult = arg.getList ();
+        }
+}