New comment by jcgruenhage on void-packages repository

https://github.com/void-linux/void-packages/pull/43233#issuecomment-1495581127

Comment:
@icp1994 wouldn't it be possible to use `build_wrksrc` for that usecase? Aside of that, yeah, for `cargo install` limiting is done with `--path`, where `cargo build` takes `--package`, agreed that separate arg vars might be useful.