[Bug c++/51556] New: Bizarre member template protection errors

["luto at mit dot edu" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51556

             Bug #: 51556
           Summary: Bizarre member template protection errors
    Classification: Unclassified
           Product: gcc
           Version: 4.6.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: luto@mit.edu


Created attachment 26086
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26086
Failing test

I'm not really sure what's going on here, so this test case isn't very well
reduced.

multiindex_success.cc compiles (as IMO it should).  multiindex_failure.cc fails
to compile (which is IMO wrong) with this error:

/usr/include/boost/multi_index/detail/index_base.hpp: In member function âvoid
A::Test2(const Irrelevant&) [with Irrelevant = int]â:
/usr/include/boost/multi_index/detail/index_base.hpp:49:44: error: âtypedef
struct boost::multi_index::detail::index_node_base<Entry, std::allocator<Entry>
> boost::multi_index::detail::index_base<Entry,
boost::multi_index::indexed_by<boost::multi_index::ordered_unique<boost::multi_index::tag<A::ById>,
boost::multi_index::member<Entry, int, &Entry::id> > >, std::allocator<Entry>
>::node_typeâ is protected
multiindex_failure.cc:42:11: error: within this context

The error is garbage, since there is no reference to node_type in that context.

The two test cases are identical except that I've reversed the order of two
member functions.

Preprocessed source attached, because I haven't yet reproduced this without
using boost libraries.

Seen on g++ (GCC) 4.6.2 20111027 (Red Hat 4.6.2-1) and an old-ish 4.7 trunk
build.