https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106139
--- Comment #1 from Iain Buclaw <ibuclaw at gdcproject dot org> --- Note, gdc-11 and gdc-10 error as a result to a different issue. --- cannot resolve type for cast(__vector(int[8]))arr --- Fix was made in a newer version of upstream dmd, so that'll be handled in the backport. https://github.com/dlang/dmd/pull/10532
