538 Restrictions  section in Retainable object pointers
541 .. _arc.objects.restrictions.conversion:
543 Conversion of retainable object pointers
565 Conversion to retainable object pointer type of expressions with known semantics
644 Conversion from retainable object pointer type in certain contexts
888 Restrictions  section in Ownership qualification
891 .. _arc.ownership.restrictions.weak:
893 Weak-unavailable types
923 Storage duration of ``__autoreleasing`` objects
944 Conversion of pointers to ownership-qualified types
1002 Passing to an out parameter by writeback
1062 Ownership-qualified fields of structs and unions