https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107138
--- Comment #4 from Marco Clemencic <marco.clemencic at gmail dot com> ---
I have a similar problem with this chunk of code:
```
#include <map>
#include <memory>
#include <string>
#include <utility>
#include <variant>
struct Wrapper {
using Map = std::map<std::string, std::string>;
using Value = std::variant<std::string, Map>;
Wrapper(Value v) : data{std::move(v)} {}
Value data;
};
auto f() {
Wrapper::Map r;
return std::make_unique<Wrapper>(std::move(r)); // <- warning here
// return std::make_unique<Wrapper>(r); // <- no warning
// return Wrapper(std::move(r)); // <- no warning
}
```
but the uninitialized variable is coming from std::unique_ptr.
As in the original report it works with gcc 11.3, but it fails with gcc12.2 and
trunk (in my case already with -O1), see https://godbolt.org/z/bfo9vsEPc
I attached the .ii produced by my test case.
