The following invalid code snippet triggers an ICE on mainline and 4.3 branch:
==================================================== template<typename...> struct A; template<typename...T> struct A<T*> { friend void foo(); }; ==================================================== bug.cc:3: error: parameter packs not expanded with `...': bug.cc:3: note: 'T' bug.cc:4: error: parameter packs not expanded with `...': bug.cc:4: note: 'T' bug.cc:5: internal compiler error: tree check: expected record_type or union_type or qual_union_type, have error_mark in maybe_add_class_template_decl_list, at cp/class.c:2540 Please submit a full bug report, [etc.] -- Summary: [4.3/4.4 regression] ICE with invalid specialization of variadic template Product: gcc Version: 4.4.0 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=35331