[Bug c++/31442] New: [4.3 regression] ICE with variadic template and default argument

[Bug c++/31442] New: [4.3 regression] ICE with variadic template and default argument

[reichelt at gcc dot gnu dot org]

More fallout from the variadic templates on mainline:

===========================================================
template<typename... T, T = 0> struct A {};

struct B
{
  template <template <typename...> class C> B(C<int>);
};

B b = A<int>();
===========================================================

bug.cc:1: error: parameter packs not expanded with `...':
bug.cc:1: note:         'T'
bug.cc:1: error: parameter pack 'T' must be at the end of the template
parameter list
bug.cc: In instantiation of 'A<int>':
bug.cc:8:   instantiated from here
bug.cc:1: error: template argument 1 is invalid
bug.cc:1: error: template argument 1 is invalid
bug.cc:8: internal compiler error: tree check: expected class 'expression',
have 'type' (integer_type) in unify, at cp/pt.c:12616
Please submit a full bug report, [etc.]

Although this ICE is also in unify as PR31441, it's in a different location.


-- 
           Summary: [4.3 regression] ICE with variadic template and default
                    argument
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code, error-recovery, monitored
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: reichelt at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31442

[Bug c++/31442] [4.3 regression] ICE with variadic template and default argument

[reichelt at gcc dot gnu dot org]

-- 

reichelt at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.3.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31442

[Bug c++/31442] [4.3 regression] ICE with variadic template and default argument

[dgregor at gcc dot gnu dot org]

-- 

dgregor at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |dgregor at gcc dot gnu dot
                   |dot org                     |org
             Status|UNCONFIRMED                 |ASSIGNED
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2007-04-25 16:45:13
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31442

[Bug c++/31442] [4.3 regression] ICE with variadic template and default argument

[dgregor at gcc dot gnu dot org]

------- Comment #1 from dgregor at gcc dot gnu dot org  2007-05-25 14:15 -------
Subject: Bug 31442

Author: dgregor
Date: Fri May 25 13:15:04 2007
New Revision: 125062

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=125062
Log:
2007-05-25  Douglas Gregor <doug.gregor@gmail.com>

        PR c++/31431
        PR c++/31432
        PR c++/31434
        PR c++/31435
        PR c++/31437
        PR c++/31438
        PR c++/31442
        PR c++/31443
        PR c++/31444
        PR c++/31445
        * error.c (dump_type): Dump TYPE_ARGUMENT_PACK nodes.
        * cp-tree.h (check_for_bare_parameter_packs): Returns bool.
        * pt.c (check_for_bare_parameter_packs): Return bool indicated
        whether everything was okay. Fix indentation.
        (push_template_decl_real): Check for bare parameter packs in
        function parameters; where errors occur, mark the parameter types
        with ERROR_MARK_NODEs to avert ICEs.
        (coerce_template_parameter_pack): New.
        (coerce_template_parms): Moved parameter pack coercion into
        coerce_template_parameter_pack, and permit it anywhere in the
        template parameter list (not just at the end). Parameter and
        argument indices can vary (somewhat) separately now, so add
        PARM_IDX and ARG_IDX.
        (fn_type_unification): Don't set an argument pack as incomplete if
        no argument pack was deduced.
        (type_unification_real): If a type parameter is a parameter pack
        and has not otherwise been deduced, it will be deduced to an empty
        parameter pack.
        (more_specialized_fn): Use the actual lengths of the argument
        lists when comparing against expansions.
        * semantics.c (finish_member_declaration): If a field's type has
        bare parameter packs, error and set its type to ERROR_MARK_NODE.

2007-05-25  Douglas Gregor <doug.gregor@gmail.com>

        PR c++/31431
        PR c++/31432
        PR c++/31434
        PR c++/31435
        PR c++/31437
        PR c++/31438
        PR c++/31442
        PR c++/31443
        PR c++/31444
        PR c++/31445
        * g++.dg/cpp0x/pr31431.C: New.
        * g++.dg/cpp0x/pr31437.C: New.
        * g++.dg/cpp0x/pr31442.C: New.
        * g++.dg/cpp0x/pr31444.C: New.
        * g++.dg/cpp0x/pr31431-2.C: New.
        * g++.dg/cpp0x/pr31432.C: New.
        * g++.dg/cpp0x/pr31434.C: New.
        * g++.dg/cpp0x/pr31438.C: New.
        * g++.dg/cpp0x/pr31443.C: New.
        * g++.dg/cpp0x/pr31445.C: New.
        * g++.dg/cpp0x/variadic-crash1.C: New.





Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/pr31431-2.C
    trunk/gcc/testsuite/g++.dg/cpp0x/pr31431.C
    trunk/gcc/testsuite/g++.dg/cpp0x/pr31432.C
    trunk/gcc/testsuite/g++.dg/cpp0x/pr31434.C
    trunk/gcc/testsuite/g++.dg/cpp0x/pr31437.C
    trunk/gcc/testsuite/g++.dg/cpp0x/pr31438.C
    trunk/gcc/testsuite/g++.dg/cpp0x/pr31442.C
    trunk/gcc/testsuite/g++.dg/cpp0x/pr31443.C
    trunk/gcc/testsuite/g++.dg/cpp0x/pr31444.C
    trunk/gcc/testsuite/g++.dg/cpp0x/pr31445.C
    trunk/gcc/testsuite/g++.dg/cpp0x/variadic-crash1.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/cp-tree.h
    trunk/gcc/cp/error.c
    trunk/gcc/cp/pt.c
    trunk/gcc/cp/semantics.c
    trunk/gcc/testsuite/ChangeLog


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31442

[Bug c++/31442] [4.3 regression] ICE with variadic template and default argument

[dgregor at gcc dot gnu dot org]

------- Comment #2 from dgregor at gcc dot gnu dot org  2007-05-25 17:54 -------
Fixed on mainline.


-- 

dgregor at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31442