[Bug c++/48320] [C++0x][4.6/4.7 Regression] Template parameter packs cannot be expanded in default template arguments

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48320

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011-09-06
                 CC|                            |dodji at gcc dot gnu.org
          Component|regression                  |c++
     Ever Confirmed|0                           |1

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> 2011-09-06 
22:52:49 UTC ---
This is a problem with fixup_template_parms; when we substitute into the
default template argument for Result, we've wrapped Indices in an
EXPR_PACK_EXPANSION, so it doesn't work as used in the default argument.