rubygem-ast from devel:libraries:libyui project
Select Your Operating System
Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:libraries:libyui/openSUSE_Tumbleweed/devel:libraries:libyui.repo zypper refresh zypper install rubygem-ast