[Bug c++/53531] <,,,,> accepted as template arguments for variadic template

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53531

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu.org

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-07-10 11:01:40 UTC ---
It's now rejected on trunk:

c.cc:3:15: error: template argument 1 is invalid
 int i = S<,,,,>::undefined;
               ^
c.cc:3:15: error: template argument 2 is invalid
c.cc:3:15: error: template argument 3 is invalid
c.cc:3:15: error: template argument 4 is invalid
c.cc:3:15: error: template argument 5 is invalid

(I might have been using an older 4.8 snapshot when I reported the bug, not
sure now.)

Jason, any idea which patch fixed these cases and if we need anything in the
testsuite to prevent regressions before closing it?