Sema: disallow slicing many-item pointer with different sentinel

This change prevents adding or changing the sentinel in the type of a
many-item pointer via the slicing syntax `ptr[a.. :S]`.
19fc5f4fb2dweiller committed on 7/31/2025, 11:02:19 AM· committed by Matthew Luggparentbce6a7c
3 files changedLine totals unavailable