This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 115d. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2024-10-26
[Voted into the WP at the February, 2012 meeting; moved to DR at the October, 2012 meeting.]
According to 13.8 [temp.res] paragraph 8,
Knowing which names are type names allows the syntax of every template definition to be checked. No diagnostic shall be issued for a template definition for which a valid specialization can be generated. If no valid specialization can be generated for a template definition, and that template is not instantiated, the template definition is ill-formed, no diagnostic required. If every valid specialization of a variadic template requires an empty template parameter pack, the template definition is ill-formed, no diagnostic required. If a type used in a non-dependent name...
It seems that these points could and should apply to template declarations that are not definitions, as well.
Proposed resolution (August, 2011):
Change 13.8 [temp.res] paragraph 8 as follows:
Knowing which names are type names allows the syntax of every templatedefinitionto be checked. No diagnostic shall be issued for a templatedefinitionfor which a valid specialization can be generated. If no valid specialization can be generated for a templatedefinition, and that template is not instantiated, the templatedefinitionis ill-formed, no diagnostic required. If every valid specialization of a variadic template requires an empty template parameter pack, the templatedefinitionis ill-formed, no diagnostic required. If a type used...