Fixtype of abstract declarators [C:6.7.7] [C:A.2.2].
This is a product type introduced by fty::defprod.
This corresponds to abstract-declarator in the grammar in [C]. This fixtype is similar to declor (see that fixtype's documentation in particular for an explanation of the modeling of the pointer part), but the abstract direct declarator is optional.
To match the grammar, we cannot have both an empty list of pointers and an absent direct abstract declarator. This constraint is currently not enforced in this fixtype.