ref: cc27169ecdd4e29944e207acc4a39f25e78b0a8f
dir: /test/link/section-union/data-overlay.out/
error: Section "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 "overlaid data" (1 error)