public void linkInheritors(final PsiMethod[] methods) {
        for (final PsiMethod superMethod : methods) {
          final PsiTypeElement superType = superMethod.getReturnTypeElement();
          if (superType == null) continue;
          addLink(superType, returnType);
          addLink(returnType, superType);
        }
      }
public void linkInheritors(final PsiMethod[] methods)