This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 114a. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2024-04-18
The special rule in 13.10.3.6 [temp.deduct.type] paragraph 10 for handling T&& in template argument deduction applies only to function parameters. It also needs to apply to function return types (including for conversion function templates, 13.10.3.4 [temp.deduct.conv]).
Rationale (February, 2012):
The specification is as intended: the special treatment of lvalue arguments in deduction is to make “perfect forwarding” work and should not be applied in other contexts.