[Bug c++/28051] New: [4.0/4.1/4.2 regression] ICE on invalid conversion operator

["reichelt at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

The following invalid code snippet causes an ICE since GCC 3.4.0:

============================================
template<int> struct A {};

template<int N> struct B : A<N>
{
    using A<N>::operator typename A::X;
};

B<0> b;
============================================

bug.cc: In instantiation of 'B<0>':
bug.cc:8:   instantiated from here
bug.cc:5: error: no type named 'X' in 'struct A<0>'
bug.cc:5: internal compiler error: tree check: expected class 'type', have
'exceptional' (error_mark) in mangle_conv_op_name_for_type, at cp/mangle.c:2826
Please submit a full bug report, [etc.]


-- 
           Summary: [4.0/4.1/4.2 regression] ICE on invalid conversion
                    operator
           Product: gcc
           Version: 4.2.0
            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=28051