[Bug c++/113498] ICE in GCC trunk: tree check: have using_decl in get_template_info, at cp/pt.cc:357

[bobmiller at nvidia dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113498

--- Comment #1 from Bob Miller <bobmiller at nvidia dot com> ---
Bug also occurs on GCC Trunk in Compiler Explorer.
Small test case to reproduce bug: https://godbolt.org/z/TorE88bMT

#include <cstdlib>

template<template<typename, size_t...> class ThisTT,
            typename T,
            size_t...Dims>
struct S_Base
{
    static constexpr size_t D = (Dims *...);
};

template<template<typename, size_t...> class ThisTT,
            typename T,
            size_t...Dims>
struct S : public S_Base<ThisTT, T, Dims...>
{
    using S_Base<ThisTT, T, Dims...>::D;
    constexpr ThisTT<T, Dims...> f() const
        requires(D > 0) {return {};}

};

template<typename T, size_t M, size_t N>
struct S2 : public S<S2, T, M, N>
{
};

int main(int, char**)
{
    S2<int, 1, 1> s2;
    s2.f();
    return 0;
}