sekret [1] filed a deletion request for learn-arch [2]: I request the deletion for security reasons. Like I mentioned in my comment, I have the suspicion that the binary which is provided in the package (named "learn-arch") could contain malicious code. There's no real reason to provide a binary file in such a package, a bash script which prints out "Success!" would absolutely be enough!
[1] https://aur.archlinux.org/account/sekret/ [2] https://aur.archlinux.org/pkgbase/learn-arch/
