[Bug regression/89733] [7/8/9 Regression] -Wuninitialized false positive with unclear message pointing to a class name

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89733

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
On the reduced testcase the warning is completely correct.
end_ is indeed uninitialized and then copied over in the Y<X> constructor.
As the ~F destructor is not defined, GCC can't optimize away those stores