This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 110b. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
[Voted into WP at October, 2009 meeting.]
The limit of 17 recursively-nested template instantiations is too small for modern programming practices such as template metaprogramming. It is unclear, however, whether this is a useful metric; see this paper for an example that honors the limit but results in over 750 billion instantiations.
Notes from the July, 2009 meeting:
The consensus of the CWG was to increase the limit to 1024.
Proposed resolution (September, 2009):
Change Clause Annex B [implimits], the fourth bullet from the end, as follows: