[Bug c++/101509] Rejects valid construction call with type inference

[gareth--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101509

--- Comment #1 from Gareth Lloyd <gar...@ignition-web.co.uk> ---
This was originally discovered where `S` was `std::vector` and was constructed
with an initializer_list