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-go/delve dev-go/delve DeprecatedEclassVariable: version 1.7.2: uses deprecated variable on line 11: 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.
This is fixed in the tree.