https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122570
--- Comment #1 from Tobias Burnus <burnus at gcc dot gnu.org> --- Looks in resolve_omp_metadirective as if we miss a 'prev_variant' and a 'prev_variant = variant->next' assignment. The feature was added in r16-4540-g80af807e52e4f4 (← version causing the regression).
