This package uses the deprecated EGO_SUM go-module.eclass variable. It must be migrated to dep tarballs (see eclassdocs) or vendored deps if upstream provide them. $ pkgcheck scan -k DeprecatedEclassVariable dev-vcs/reposurgeon dev-vcs/reposurgeon DeprecatedEclassVariable: version 4.27: uses deprecated variable on line 37: EGO_SUM (no replacement)
William asked that I comment on all of these bugs to note you don't need to revbump to fix it as it'll be successfully installed already.