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[Bug c++/20463] New: [4.0/4.1 regression] ICE on using undefined type


This invalid code snippet produces ICE on mainline and 4.0 branch:

-------------------------------------------------------------------------------
template < typename T > struct C;

template < typename T > void C < T > :: f ()
{
  const foo bar;
}
-------------------------------------------------------------------------------

foo.cc:3: error: invalid use of undefined type ?struct C<T>?
foo.cc:1: error: declaration of ?struct C<T>?
foo.cc:3: error: template definition of non-template ?void C<T>::f()?
foo.cc: In member function ?void C<T>::f()?:
foo.cc:5: error: ?foo? does not name a type
foo.cc:5: internal compiler error: Segmentation fault

-- 
           Summary: [4.0/4.1 regression] ICE on using undefined type
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code, error-recovery
          Severity: minor
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: belyshev at depni dot sinp dot msu dot ru
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20463


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