This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 112c. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
[Accepted as a DR at the June, 2018 (Rapperswil) meeting.]
According to 184.108.40.206 [expr.prim.id.unqual] paragraph 1,
An identifier is an id-expression provided it has been suitably declared (Clause 9 [dcl.dcl]).
Not only is an identifier an id-expression by (grammatical) definition, declarator-id is defined in terms of id-expression, which makes this circular. If the intention was to disallow use of undeclared identifiers as primary expressions, this should be altered accordingly.
Proposed resolution, February, 2018:
Change 220.127.116.11 [expr.prim.id.unqual] paragraph 1 as follows:
An identifier is an id-expression
providedit has been suitably declared ( Clause 9 [dcl.dcl]) . [Note: For operator-function-ids, see...