[Bug c++/66336] New: [C++14][Variable templates] Spurious "error: expansion pattern contains no argument packs"

[Bug c++/66336] New: [C++14][Variable templates] Spurious "error: expansion pattern contains no argument packs"

[lucdanton at free dot fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66336

            Bug ID: 66336
           Summary: [C++14][Variable templates] Spurious "error: expansion
                    pattern contains no argument packs"
           Product: gcc
           Version: 5.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: lucdanton at free dot fr
  Target Milestone: ---

Created attachment 35651
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35651&action=edit
Minimal testcase

$ g++-trunk --version
g++-trunk (GCC) 5.1.0
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ cat main.cpp            
template<typename>
int i {};

template<typename... Xs>
void f()
{
    // error: expansion pattern 'i<Xs>' contains no argument packs
    int is[] = { i<Xs>... };
}

int main()
{
    f<void, void, void>();
}
$ g++-trunk -std=c++14 main.cpp
main.cpp: In function 'void f()':
main.cpp:8:23: error: expansion pattern 'i<Xs>' contains no argument packs
     int is[] = { i<Xs>... };

[Bug c++/66336] [C++14][Variable templates] Spurious "error: expansion pattern contains no argument packs"

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66336

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2015-08-05
                 CC|                            |jason at gcc dot gnu.org
           Assignee|unassigned at gcc dot gnu.org      |jason at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed on the trunk by r225692.

[Bug c++/66336] [C++14][Variable templates] Spurious "error: expansion pattern contains no argument packs"

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66336

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ldionne.2 at gmail dot com

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
*** Bug 65706 has been marked as a duplicate of this bug. ***

[Bug c++/66336] [C++14][Variable templates] Spurious "error: expansion pattern contains no argument packs"

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66336

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Thu Aug  6 04:09:49 2015
New Revision: 226655

URL: https://gcc.gnu.org/viewcvs?rev=226655&root=gcc&view=rev
Log:
        PR c++/66336
        * pt.c (find_parameter_packs_r): Handle variable templates.
        (variable_template_specialization_p): New.
        * cp-tree.h: Declare it.

Added:
    branches/gcc-5-branch/gcc/testsuite/g++.dg/cpp1y/var-templ33.C
Modified:
    branches/gcc-5-branch/gcc/cp/ChangeLog
    branches/gcc-5-branch/gcc/cp/cp-tree.h
    branches/gcc-5-branch/gcc/cp/pt.c

[Bug c++/66336] [C++14][Variable templates] Spurious "error: expansion pattern contains no argument packs"

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66336

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |5.3

--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed for 5.3.