[Bug c++/99589] lambda init-capture without initializer in C++20

[hewillk at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99589

--- Comment #1 from 康桓瑋 <hewillk at gmail dot com> ---
reduced:

auto f(auto x) {
 [...x]{};
}