[Bug c++/83205] ICE on structured binding with ill-formed negative std::tuple_size<T>::value

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83205

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 42744
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42744&action=edit
gcc8-pr83205.patch

Untested fix.