[Bug libstdc++/109442] Dead local copy of std::vector not removed from function

[antoshkka at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109442

--- Comment #34 from Antony Polukhin <antoshkka at gmail dot com> ---
The memory allocation is still not elided for a sample from duplicate ticket
116651:

bool test1(const std::vector<int>& in) {
    return in == std::vector<int>{42};
}


My naiive expectation is that the `test1` function would be optimized to an
equivalent of:


bool test2(const std::vector<int>& in) {
    return in.size() == 1 && in[0] == 42;
}


Godbolt playground https://godbolt.org/z/sn5Gzq1P6