MarsSeed [1] filed a deletion request for rust-nightly [2]: Unmaintained since 2019. Unused (0 pkgstats).
Arch/extra/rustup can be used to download Rust Nightly. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/rust-nightly/
