ref: 913c3dd7117bfe7a2d1cb57b47b34cfc8dcbb98b
dir: /test/link/section-union/split-data.out/
error: Section "mutually-overlaid data" is of type ROM0, which cannot be unionized --- error: <stdin>(18): Cannot declare ROM sections as UNION FATAL: <stdin>(18): Cannot create section "mutually-overlaid data" (1 error)