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Date: Mon, 17 Sep 2007 22:10:00 -0000
Subject: [Bug c++/33461]  New: [4.3 regression] ICE with invalid specialization involving parameter packs
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The following invalid testcase triggers an ICE on mainline:

===================================
template<typename> struct A;

template<typename... T> struct A<T*>
{
  struct B;
};

A<void*> a;
===================================

bug.cc:3: error: parameter packs not expanded with `...':
bug.cc:3: note:         'T'
bug.cc:4: error: parameter packs not expanded with `...':
bug.cc:4: note:         'T'
bug.cc: In instantiation of 'A<void*>':
bug.cc:8:   instantiated from here
bug.cc:5: error: type/value mismatch at argument 1 in template parameter list
for 'template<class ... T> struct A<T*>::B'
bug.cc:5: error:   expected a type, got '<expression error>'
bug.cc:5: internal compiler error: tree check: expected class 'type', have
'exceptional' (error_mark) in tsubst_decl, at cp/pt.c:8091
Please submit a full bug report, [etc.]

Replacing "A<T*>" by "A<T*...>" triggers the following ICE:

bug.cc:4: error: cannot expand 'T* ...' into a fixed-length argument list
bug.cc:9: internal compiler error: in unify, at cp/pt.c:12975
Please submit a full bug report, [etc.]


-- 
           Summary: [4.3 regression] ICE with invalid specialization
                    involving parameter packs
           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=33461