This was uncovered by https://github.com/dlang/dmd/pull/12409/
@WalterBright created dlang/dmd pull request #12434 "fix Issue 21827 - Null pointer exception in elToPair() in backend/cge…" fixing this issue: - fix Issue 21827 - Null pointer exception in elToPair() in backend/cgelem.d https://github.com/dlang/dmd/pull/12434
dlang/dmd pull request #12434 "fix Issue 21827 - Null pointer exception in elToPair() in backend/cge…" was merged into master: - aff474d0621cbebbb36c94cc1dd38772293acde6 by Walter Bright: fix Issue 21827 - Null pointer exception in elToPair() in backend/cgelem.d https://github.com/dlang/dmd/pull/12434