[Bug c++/19063] New: [3.4/4.0 regresion] ICE on invalid template parameter

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

The following testcase causes an ICE since gcc 3.4.0:

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

PR13268B.cc:5: error: expected identifier before 'operator'
PR13268B.cc:5: error: declaration of 'operator>' as non-function
PR13268B.cc:5: internal compiler error: tree check: expected class
'declaration', have 'type' (void_type) in process_template_parm, at cp/pt.c:2318
Please submit a full bug report, [etc.]

The bug is similar to PR13268 in that grokdeclarator returns values that
the caller cannot handle gracefully.
But in this case we actually have a regression.

Btw, if an error occurs, grokdeclarator might be returning 0 (which should
probably be NULL_TREE), error_mark_node (which is not documented) or
void_type_node (even if the caller expects a declaration as in this bug)
or ...

Is this intended, or is some heavy cleanup required?

-- 
           Summary: [3.4/4.0 regresion] ICE on invalid template parameter
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code, error-recovery, monitored
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: reichelt at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19063