davidxia [1] filed a deletion request for monaco-powerline-font-git
[2]:

Your packaging has a bug. It can't install because it fails to git
checkout a branch. I fixed it here.
https://aur.archlinux.org/packages/monaco-powerline-font-fixed-git/

Hopefully you can pull this upstream.

[1] https://aur.archlinux.org/account/davidxia/
[2] https://aur.archlinux.org/pkgbase/monaco-powerline-font-git/