The C++ frontend issues a broken diagnostic for the following invalid testcase on mainline:
=========================================== template<int... N> void foo(int... x[N]) { struct A { A() { x; } }; } =========================================== bug.cc: In constructor 'foo(int [N]...)::A::A()': bug.cc:5: error: use of parameter from containing function bug.cc:1: error: '#'type_pack_expansion' not supported by dump_type_prefix#<typeprefixerror>x#'type_pack_expansion' not supported by dump_type_suffix#' declared here -- Summary: [4.3 regression] Broken diagnostic: 'type_pack_expansion' not supported by dump_type_prefix/suffix Product: gcc Version: 4.3.0 Status: UNCONFIRMED Keywords: diagnostic, 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=34395