This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 117b. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2025-08-11
1830. Repeated specifiersSection: 9.1 [dcl.pre] Status: CD4 Submitter: Ville Voutilainen Date: 2014-01-10[Moved to DR at the November, 2014 meeting.]
Although repeated type-specifiers such as const are forbidden, there is no such prohibition against repeated non-type specifiers like constexpr and virtual. Should there be?
On the “con” side, it's not clear that such a prohibition actually helps anyone; it could happen via macros, and a warning about non-macro use could be a QoI issue. Also, C99 moved in the opposite direction, removing the prohibition against repeated cv-qualifiers.
Proposed resolution (February, 2014):
Add the following as a new paragraph before 9.2 [dcl.spec] paragraph 2:
Each decl-specifier shall appear at most once in the complete decl-specifier-seq of a declaration, except that long may appear twice.
If a type-name is encountered...
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