Marked for autoremoval on 08 February: #978198high
Version 2.21.2-2 of r-cran-rstan is marked for autoremoval from testing on Mon 08 Feb 2021. It is affected by #978198. The removal of r-cran-rstan will also cause the removal of (transitive) reverse dependency: r-cran-shinystan. You should try to prevent the removal by fixing these RC bugs.