KEYWORDS="*" is invalid as per PMS https://dev.gentoo.org/~ulm/pms/head/pms.html#x1-260003.1.6 https://dev.gentoo.org/~ulm/pms/head/pms.html#x1-690007.3.2 repoman does not warn about it
probably should make it into a layout.conf option so we can enable it in the main gentoo repo
repoman support has been removed per bug 835013. Please file a new bug (or, I suppose, reopen this one) if you feel this check is still applicable to pkgcheck and doesn't already exist.
Not sure if pkgcheck does this.
After checking it in pkgcheck, it reports for those two wrong keywords: UnknownKeywords: version 1: unknown KEYWORDS: '*' UnknownKeywords: version 2: unknown KEYWORDS: '~*' While "-*" is accepted of course (as correct by PMS). So it is already implemented in pkgcheck, so closing