[Bug c++/85963] [8/9 Regression] false positive "set but not used" warning [-Wunused-but-set-variable]

[mcortez at airpost dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85963

--- Comment #3 from Michael Cortez <mcortez at airpost dot net> ---
Created attachment 44257
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44257&action=edit
bug.cpp

simplified test case