<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/93256>93256</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clang crashes with nested `std::apply()` calls
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          Robochu
      </td>
    </tr>
</table>

<pre>
    The following code causes Clang to crash:
```cpp
#include <tuple>

template<typename A, typename B>
void bar(A a, B b) {}

template<typename... A, typename... B>
void foo(std::tuple<A...> a, std::tuple<B...> b) {
        std::apply([b](auto... a) {
                (std::apply([a](auto... b) {
                        (bar(a, b), ...);
                }, b), ...);
        }, a);
}

int main() {
        foo(std::tuple<>{}, std::tuple<>{});
}

```
https://godbolt.org/z/E5qYEfGd3
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJyEU02PpCAQ_TXlhYyhS7H1wKG_3PtmL3tEoJUNiis4k9lfv6E17nT3TiYhEqpe1Xs-KOG9aQetObAjsHMi5tC5iX93jZPdnDROvfMfnSZXZ617M0NLpFOaSDF77cnJiqElwRE5Cd9BdgB6BnqAgi5LjuMawcwM0s5KE8hOYR6thuyy5m7foPvRiqBj-n3Ug-g1OQCeyHY6bhWvzijSiAmwPBARQUfSAFYE9kfYn79om6bpfecYeGh-dQ6w9EHFf8oOq-DTIU1TyC4L51P2uGY3KauOakOKcbTvgCWwYwPsDFiKObjILx5r4vqg4EOluK98YtuKF4duWiMo7lEhVpDdo_fnLzALQNyF7302QyC9MEOU-KDnEy-j4ct1_c_LD9lPObdnthy7EEYfu2ANWLdONc6G1E0tYP0HsL6w3z8v128qSxTPVJVVItF8t98VjFZY5EnHi2pfsJ1WiopdQZnclVdZYcnKsmCVFk1iOFLMKcOcUrrP81RIIVVeaCpRXlEi5FT3wtjU2tc-cifG-1nzKkNWJFY02vrbqCHKODuAGKdu4hH_0syth5xa44P_1yGYYDVfRu02Z9qTNxM6MmgftCJQ0OdnghUUlEhhrU_myfIHc0zo5iaVrgesI9G6vYyT-6VlAKxvuj1gvUh_5fg3AAD__0JgJ-Y">