[Bug c++/85108] Incorrect warning for constexpr lambda with -Wunused-but-set-variable

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85108

--- Comment #1 from Eric Gallager <egallager at gcc dot gnu.org> ---
*** Bug 85109 has been marked as a duplicate of this bug. ***