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

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

@@ -0,0 +1,15 @@
+import java.util.*;
+
+public class Test<T>
+{
+        List<Collection<T>> getList ()
+        {
+                return new ArrayList<Collection<T>> ();
+        }
+
+        public void test2 (Test<?> arg)
+        {
+            final List<? extends Collection<?>> collection = result;
+            collection = arg.getList ();
+        }
+}

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 ();
+        }
+}

java/java-tests/testSrc/com/intellij/refactoring/IntroduceVariableTest.java

@@ -273,6 +273,10 @@ public class IntroduceVariableTest extends LightCodeInsightTestCase {
   public void testPolyadic() throws Exception {
     doTest(new MockIntroduceVariableHandler("b1", true, true, true, "boolean"));
   }
+  
+  public void testAssignmentToUnresolvedReference() throws Exception {
+    doTest(new MockIntroduceVariableHandler("collection", true, true, true, "java.util.List<? extends java.util.Collection<?>>"));
+  }
 
   public void testSiblingInnerClassType() throws Exception {
     doTest(new MockIntroduceVariableHandler("vari", true, false, false, "A.B") {