archibald869 [1] filed a deletion request for cling-nightly [2]: I created this package for nightly builds of cling because for a long time no new version was released although development proceeded (see https://github.com/root-project/cling/releases). Now, new versions are released more frequently, whereas nightly builds are not up to date anymore (see https://root.cern.ch/download/cling/). Therefore, this package is superfluous and should be deleted in favor of https://aur.archlinux.org/packages/cling.
[1] https://aur.archlinux.org/account/archibald869/ [2] https://aur.archlinux.org/pkgbase/cling-nightly/
