The librust-crossbeam+nightly-dev package no longer exists as a seperate package since Ubuntu 20.10 Groovy. It is now a virtual package provided by librust-crossbeam-dev, which I have confirmed is installable in Groovy, Hirsute and Impish.
The librust- crossbeam+ nightly- dev package no longer exists as a seperate package since Ubuntu 20.10 Groovy. It is now a virtual package provided by librust- crossbeam- dev, which I have confirmed is installable in Groovy, Hirsute and Impish.