Linux kernel has a Rust version policy:

“The kernel documents the minimal requirements to compile it. In the case of Rust, currently only a single version is supported (i.e. rather than a minimum)”

https://www.phoronix.com/news/Linux-Kernel-To-Rust-1.77

update
:: Synchronizing package databases…
kde-unstable is up to date
core is up to date
extra is up to date
error: failed retrieving file ‘kde-unstable.db’ from pkg.fef.moe : SSL certificate problem: certificate has expired
error: failed retrieving file ‘core.db’ from pkg.fef.moe : SSL certificate problem: certificate has expired
error: failed retrieving file ‘extra.db’ from pkg.fef.moe : SSL certificate problem: certificate has expired
warning: too many errors from pkg.fef.moe, skipping for the remainder of this transaction
:: Starting full system upgrade…
there is nothing to do
:: Synchronizing package databases…
kde-unstable is up to date
core is up to date
extra is up to date
error: failed retrieving file ‘kde-unstable.db’ from pkg.fef.moe : SSL certificate problem: certificate has expired
error: failed retrieving file ‘core.db’ from pkg.fef.moe : SSL certificate problem: certificate has expired
error: failed retrieving file ‘extra.db’ from pkg.fef.moe : SSL certificate problem: certificate has expired
warning: too many errors from pkg.fef.moe, skipping for the remainder of this transaction
:: Searching AUR for updates…
:: Searching databases for updates…
there is nothing to do

Installing reflector and updating my mirror by download rate just solved the issue completely:

reflector –verbose -l 5 –sort rate –save /etc/pacman.d/mirrorlist

First video is the computation of Fibonacci (42) and seconds the prime numbers < 250.001

A screenshot from a Telegram group by another anonymous reddit user