Parse the rest of a direct abstract declartor.
(parse-direct-abstract-declarator-rest prev-dirabsdeclor prev-span pstate) → (mv erp dirabsdeclor span new-pstate)
This is called after parsing either the initial parenthesized abstract declarator or the first array or function abstract declarator. Whichever it is, it is passed to this function, along with its span, and in this function we read zero or more additional array and function abstract declarators, combining them with the one passed to this function.