https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80187
--- Comment #3 from Ambroz Bizjak <ambrop7 at gmail dot com> --- Hey, Does this idea help: https://godbolt.org/g/3Iqp2c ? The storage is an array of "special" byte classes which have empty constructors/assign when those would be implemented by one of the mixins.