https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88525
--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- I'd say the enum member a is declared by a contained struct-declaration, not by the declaration itself. The case of reading the text to allow for a declarator inside a struct-declaration was addressed in response to C90 DR#115 by adding (in C99) the "(other than the parameters of a function or the members of a structure or union)" now present after "declarator". I expect it simply wasn't noticed at the time that much the same issue would apply to tags, and enum members, declared inside of a structure or union. I think the intent stated in that DR response applies here as well: "In the case of an aggregate, the intent was to require a tag or declarator for the aggregate itself.".
