I don't understand your concern. You're upset that new features are not backported to older compiler versions? If you have some reason to not update your comp

I don't understand your concern. You're upset that new features are not backported to older compiler versions? If you have some reason to not update your compiler, then don't use those new features, and use dependency versions that also don't use those features. Go back a few releases if you need to. If you do need those features though... Then just upgrade your compiler? I'm not aware of any compilers/interpreters that work the way you want here. Maybe Python 2 for that painful decade of overlap...