@Nullable
  protected PsiElement isStaticFinalInitializer(PsiExpression expr) {
    PsiClass parentClass = expr != null ? getParentClass(expr) : null;
    if (parentClass == null) return null;
    IsStaticFinalInitializerExpression visitor = new IsStaticFinalInitializerExpression(parentClass, expr);
    expr.accept(visitor);
    return visitor.getElementReference();
  }
@Nullable
  protected PsiElement isStaticFinalInitializer(PsiExpression expr)