The following invalid testcase triggers an ICE on mainline: ========================================= template<void> struct A;
template<typename> struct B; template<void N> struct B<A<N> > {}; ========================================= bug.cc:1: error: 'void' is not a valid type for a template constant parameter bug.cc:5: error: 'void' is not a valid type for a template constant parameter bug.cc:5: error: 'N' was not declared in this scope bug.cc:5: error: template parameters not used in partial specialization: bug.cc:5: internal compiler error: tree check: expected tree_list, have error_mark in process_partial_specialization, at cp/pt.c:2693 Please submit a full bug report, [etc.] This is probably fallout from PR 27668. -- Summary: [4.2 regression] ICE using invalid template class in specialization Product: gcc Version: 4.2.0 Status: UNCONFIRMED Keywords: ice-on-invalid-code, error-recovery, monitored Severity: minor Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: reichelt at gcc dot gnu dot org BugsThisDependsOn: 27668 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28737