[Bug c++/96400] False positive on Wunused-but-set-variable for static constexpr var used in lambda

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96400

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2021-07-27

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Here is the most reduced C++20 testcase which produce the warning:
void test(auto){}
void func()
{
    static auto is_zero = [](){ };
    test([](auto v){return is_zero(*v);});
}

Here is a C++17 testcase:
template<typename t> void test(t){}

void func()
{
    static auto is_zero = [](){ };
    test([](auto v){return is_zero(*v);});
}