Issue with clang, tuple and c++23

[mattgodbolt]

Describe the bug

CHECK()-ing tuples on clang (using GCC's stdlib) gives a compile error when compiled with -std=c++23

#include <catch2/catch_test_macros.hpp>
#include <tuple>

using namespace std::literals;

TEST_CASE("tuples") {
    std::tuple<int, int> bob;
    CHECK(bob == std::make_tuple(4, 2));
}

Compiler error is:

error: implicit instantiation of undefined template 'std::tuple_size<Catch::Decomposer>'

Demo: https://compiler-explorer.com/z/hce5jxYWc

Expected behavior
It should compile.

Reproduction steps

As above, using clang with -std=c++23 , but -std=c++20 is OK

Platform information:
Catch version: 3.7.* and onward

Additional context
Entirely possible this is a clang/gcc interop bug. But I figured I'd file here in case someone goes "Oh! I know what that is..."

[mattgodbolt]

A disgusting workaround is:

namespace std {
template<> struct tuple_size<Catch::Decomposer> { static constexpr size_t value = 1; };
}

[horenmar]

So, GCC + libstdc++ works, Clang + libc++ works, Clang + libstdc++ does not.

I am going to call this a third party bug for now, it would not be the first time there was breakage from mixing Clang and libstdc++ in specific version.