ref: 10e3f1a02b01b7a4c5b94d121f80284fb321c723
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)