https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91525
--- Comment #3 from gcc-bugs at marehr dot dialup.fu-berlin.de --- On gcc-10 I get now the following stacktrace: ``` g++-git -std=c++17 -fconcepts -c ice.cpp main.cpp: In function ‘std::string e()’: main.cpp:46:16: internal compiler error: Segmentation fault 46 | std::cout << o; | ^ 0xc5b15f crash_signal /home/marehr/Packages/gcc-git/src/gcc/gcc/toplev.c:328 0x645182 compare_ics /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/call.c:10538 0x648c84 joust /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/call.c:11191 0x649cbc tourney /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/call.c:11630 0x649fd1 build_user_type_conversion_1 /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/call.c:4165 0x64b435 implicit_conversion /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/call.c:2053 0x64baf0 good_conversion(tree_node*, tree_node*, tree_node*, int, int) /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/call.c:2093 0x77183e check_non_deducible_conversion /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/pt.c:21173 0x77183e check_non_deducible_conversions /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/pt.c:20645 0x77183e fn_type_unification(tree_node*, tree_node*, tree_node*, tree_node* const*, unsigned int, tree_node*, unification_kind_t, int, conversion**, bool, bool) /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/pt.c:20947 0x64e879 add_template_candidate_real /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/call.c:3394 0x64f046 add_template_candidate /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/call.c:3479 0x64f046 add_candidates /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/call.c:5805 0x64f612 add_candidates /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/call.c:5720 0x64f612 add_operator_candidates /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/call.c:5909 0x6545eb build_new_op_1 /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/call.c:6132 0x6551ed build_new_op(op_location_t const&, tree_code, int, tree_node*, tree_node*, tree_node*, tree_node**, int) /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/call.c:6520 0x7a563a build_x_binary_op(op_location_t const&, tree_code, tree_node*, tree_code, tree_node*, tree_code, tree_node**, int) /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/typeck.c:4245 0x70c7ad cp_parser_binary_expression /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/parser.c:9650 0x70d575 cp_parser_assignment_expression /home/marehr/Packages/gcc-git/src/gcc/gcc/cp/parser.c:9785 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <https://bugs.archlinux.org/> for instructions ```