show warning on type parameter declaration if it lead to multiple methods with same erasure (java7 only)

java/java-impl/src/com/intellij/codeInsight/daemon/impl/analysis/GenericsHighlightUtil.java

@@ -372,6 +372,7 @@ public class GenericsHighlightUtil {
     }
   }
 
+  @Nullable
   public static HighlightInfo checkElementInTypeParameterExtendsList(PsiReferenceList referenceList, JavaResolveResult resolveResult, PsiElement element) {
     PsiClass aClass = (PsiClass)referenceList.getParent();
     final PsiJavaCodeReferenceElement[] referenceElements = referenceList.getReferenceElements();
@@ -393,6 +394,11 @@ public class GenericsHighlightUtil {
       IntentionAction fix = QUICK_FIX_FACTORY.createExtendsListFix(aClass, type, false);
       QuickFixAction.registerQuickFixAction(errorResult, fix, null);
     }
+    if (errorResult == null && JavaVersionService.getInstance().isAtLeast(referenceList, JavaSdkVersion.JDK_1_7) && 
+        referenceElements.length > 1) {
+      //todo suppress erased methods which come from the same class
+      return checkOverrideEquivalentMethods(aClass);
+    }
     return errorResult;
   }
   public static HighlightInfo checkInterfaceMultipleInheritance(PsiClass aClass) {