[Bug c++/126314] ICE: in cp_gimplify_expr, at cp/cp-gimplify.cc:1049

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126314

--- Comment #1 from eczbek.void at gmail dot com ---
Reduced a little bit: https://godbolt.org/z/91bxj4jW1

```
constexpr bool is_consteval() {
        if consteval {
                return true;
        } else {
                return false;
        }
}

consteval int foo(int n) {
        return n;
}

struct base {
        int data;

        constexpr base(auto n)
        : data(is_consteval() ? foo(n) : n) {}
};

struct derived : base {
        using base::base;
};

int main() {
        derived(0);
}
```