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.
The list of contexts in which pack expansions can occur, in 13.7.4 [temp.variadic] paragraph 4, does not include a function call, in spite of the comments in the example there that assume that a function call is such a context.
Rationale (August, 2010):
initializer-list, mentioned in 13.7.4 [temp.variadic], is used in the argument list of a function call.