I'm not tuned in to the nuances here but I note that whoever felt they understood it well enough to update Wikipedia summarized this as "The C23 standard makes

I'm not tuned in to the nuances here but I note that whoever felt they understood it well enough to update Wikipedia summarized this as "The C23 standard makes VLA types mandatory again. Only creation of VLA objects with automatic storage duration is optional." https://en.wikipedia.org/wiki/Variable-length_array#C99 https://en.wikipedia.org/wiki/Variable-length_array#C99 If that phrasing isn't accurate I'm sure they'd appreciate an edit.