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Fixtype of structure or union specifiers [C17:6.7.2.1] [C17:A.2.2].
This is a product type introduced by fty::defprod.
This corresponds to struct-or-union-specifier in the grammar in [C17], but without the initial struct-or-union. The only use of this fixtype is in type-spec, where we have two separate cases for structures and unions.
This fixtype is a little broader than the grammar, because it allows an absent name and no members. But this definition is simpler, and the disallowed case can be ruled out via predicates over the abstract syntax.
This fixtype does not cover structure types with no members, which is a GCC extension; this is covered as a separate case in type-spec.
As a GCC extension, we allow zero or more attribute specifiers.
In the concrete syntax, these come just after