https://godbolt.org/z/MxacGPbGo

```cpp
struct A1 {
    A1(int a)
        : a(a)
    {
    }

    auto get(this A1 const &self)
    {
        return self.a;
    }

private:
    int a;
};

struct B1 : private A1 {
    using A1::get;
};

auto f(B1 &b)
{
    auto n = b.get(); // doesn't work. bad
    (void)n;
}

struct A2 {
    A2(int a)
        : a(a)
    {
    }

    auto get() const
    {
        return this->a;
    }

private:
    int a;
};

struct B2 : private A2 {
    using A2::get;
};

auto f(B2 &b)
{
    auto n = b.get(); // works. good
    (void)n;
}

```

The only difference is that explicit object parameter is used in A1::get but
not in A2::get.