return type equivalence: compare supers with current method (IDEA-147335)

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

@@ -0,0 +1,12 @@
+abstract class Child implements Human {}
+interface Human extends Mother, Father {
+  Human me();
+}
+
+interface Father {
+  Father me();
+}
+
+interface Mother {
+  Mother me();
+}