[Bug c/127192] -Wunused-value warns about static_assert in expression

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127192

--- Comment #2 from eczbek.void at gmail dot com ---
A workaround: (0?static_assert(true):(void)0)