ref: 9e3d7a50e6a93152f60872dd03080c2c1942a97e
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 errors)