rust-proc-macro2-0.4 from openSUSE:infrastructure:geckodriver project
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For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:infrastructure:geckodriver/openSUSE_Tumbleweed/openSUSE:infrastructure:geckodriver.repo zypper refresh zypper install rust-proc-macro2-0.4