ref: 7635a2fc747e19cde64aea96f6c0f71ffec25a5a
dir: /test/link/section-union/split-data.out/
error: Section "mutually-overlaid data" is of type ROM0, which cannot be unionized --- ERROR: -(18): Cannot declare ROM sections as UNION ERROR: -(18): Cannot create section "mutually-overlaid data" (1 errors)