Discrad return value using std::ignore

[leeorsaar]

std::ignore will be legal to use outside std::tie

Is using std::ignore (part of the library) a good enough solution for us or should we add a different way that does not rely on the library?
I believe std::ignore is good enough but I'd like to hear some more opinions

[regevran]

1. the mentioned paper is part of the standard - it can be used in std::tie but also in other places such as for [[nodicard]] functions that the user wants to discard.
2. _ is already applied as a general placeholder for non used return types for C++26.

But my question is - we want to use existing variables - not ignore them - so how this is issue is related to the changes we are discussing?