allow unchecked generics in comparing unrelated return types (IDEA-123316)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting/IDEA123316.java

@@ -0,0 +1,24 @@
+class Temp {
+
+  interface Future<F> {}
+
+  class Message {
+  }
+
+  interface Client<C extends Client, M> {
+    <T> Future<T> request(M request);
+  }
+
+  interface MessageClient extends Client<MessageClient, Message> {
+    Future<Message> request(Message request);
+  }
+
+  abstract class AbstractClient implements MessageClient {
+  }
+
+  class ConcreteClient extends AbstractClient {
+    public Future<Message> request(Message request) {
+      return null;
+    }
+  }
+}