名称注入失败：为什么找不到基构造函数的名称？[复制]

问：

gcc 和 clang 都同意：只有当派生类派生自显式（“硬编码”）专用化时，才会注入模板化类的基构造函数名称。

有人可以理解并解释为什么吗？

接受

template<int Size>
struct Base
{};

template<int Size>
struct Derived : Base<0> // only difference here
{
    Derived() : Base() {} // line 8
};

int main()
{
    (void) Derived<0>{};
}

拒绝

template<int Size>
struct Base
{};

template<int Size>
struct Derived : Base<Size> // only difference here
{
    Derived() : Base() {} // line 8, must be ': Base<Size>' although the name 'Base' should be injected in Derived.
};

int main()
{
    (void) Derived<0>{};
}

跟8:17: error: class 'Derived<Size>' does not have any field named 'Base'

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