https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67249
Bug ID: 67249 Summary: [concepts] ICE parsing f(pair<auto, concept>) Product: gcc Version: 6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: cubbi at cubbi dot org Target Milestone: --- ICE using gcc HEAD 6.0.0 20150816 to compile the following template<class T> concept bool C1 = true; template<class A, class B> struct Pair {}; void f(Pair<auto, C1>); int main() {} output: prog.cc:3:19: internal compiler error: Segmentation fault void f(Pair<auto, C1>); ^ 0xa65abf crash_signal /home/heads/gcc/gcc-source/gcc/toplev.c:352 0x629184 get_concept_from_constraint /home/heads/gcc/gcc-source/gcc/cp/parser.c:34610 0x629184 synthesize_implicit_template_parm /home/heads/gcc/gcc-source/gcc/cp/parser.c:34648 0x6297a2 cp_parser_maybe_constrained_type_specifier /home/heads/gcc/gcc-source/gcc/cp/parser.c:15707 0x62e004 cp_parser_maybe_concept_name /home/heads/gcc/gcc-source/gcc/cp/parser.c:15732 0x62e004 cp_parser_nonclass_name /home/heads/gcc/gcc-source/gcc/cp/parser.c:15785 0x644681 cp_parser_type_name /home/heads/gcc/gcc-source/gcc/cp/parser.c:15571 0x644681 cp_parser_simple_type_specifier /home/heads/gcc/gcc-source/gcc/cp/parser.c:15485 0x634c55 cp_parser_type_specifier /home/heads/gcc/gcc-source/gcc/cp/parser.c:15154 0x637273 cp_parser_type_specifier_seq /home/heads/gcc/gcc-source/gcc/cp/parser.c:19139 0x640262 cp_parser_type_id_1 /home/heads/gcc/gcc-source/gcc/cp/parser.c:19005 0x64035e cp_parser_template_type_arg /home/heads/gcc/gcc-source/gcc/cp/parser.c:19060 0x64268b cp_parser_template_argument /home/heads/gcc/gcc-source/gcc/cp/parser.c:14578 0x64268b cp_parser_template_argument_list /home/heads/gcc/gcc-source/gcc/cp/parser.c:14488 0x64268b cp_parser_enclosed_template_argument_list /home/heads/gcc/gcc-source/gcc/cp/parser.c:25096 0x643493 cp_parser_template_id /home/heads/gcc/gcc-source/gcc/cp/parser.c:14162 0x643c21 cp_parser_class_name /home/heads/gcc/gcc-source/gcc/cp/parser.c:20289 0x63e07e cp_parser_qualifying_entity /home/heads/gcc/gcc-source/gcc/cp/parser.c:5776 0x63e07e cp_parser_nested_name_specifier_opt /home/heads/gcc/gcc-source/gcc/cp/parser.c:5462 0x64428f cp_parser_simple_type_specifier /home/heads/gcc/gcc-source/gcc/cp/parser.c:15457 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <http://gcc.gnu.org/bugs.html> for instructions.