The following invalid code snippet triggers an ICE on the 4.1 branch and mainline:
=============================== template<void, int> struct A; =============================== bug6.cc:1: error: 'void' is not a valid type for a template constant parameter bug6.cc:1: internal compiler error: tree check: expected tree_list, have error_mark in process_template_parm, at cp/pt.c:2359 Please submit a full bug report, [etc.] This is fallout from PR 27668. -- Summary: [4.1/4.2 regression] ICE with invalid template parameter 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 BugsThisDependsOn: 27668 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28594