-Wunused-variable triggers for temporaries with side effects when bound to a reference #54489
Description
The following code warns on guard2 and guard3 (but not guard) despite all 3 variable having side effects on destruction.
This feels inconsistent and surprising.
GCC emits no warning in any of these cases.
struct RAIIWrapper {
RAIIWrapper();
~RAIIWrapper();
};
void foo() {
auto const guard = RAIIWrapper();
auto const& guard2 = RAIIWrapper(); //unused variable 'guard2'
auto && guard3 = RAIIWrapper(); //unused variable 'guard3'
}https://godbolt.org/z/zr7dsevoc