[Bug c++/91335] False positive "unused variable" warning with variable initialized in 'if' condition

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91335

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
You can still do that without a named variable:

if (static_cast<int*>(foo())) {
  return 1;
}