archibald869 [1] filed a deletion request for cling-nightly-bin [2]:

The nightly builds of cling are not suitable for Arch Linux. Compiling cling by oneself (e.g. by means of cling-nightly [1]) is the way to go.

[1] https://aur.archlinux.org/packages/cling-nightly/

[1] https://aur.archlinux.org/account/archibald869/ [2] https://aur.archlinux.org/pkgbase/cling-nightly-bin/