[Bug c++/89192] -Wuninitialized doesn't warn about a vector initialization with uninitialized field

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89192

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Or rather it is not the destructor call but the load of 'b' from *this that is
not "optimized".