https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84447
Bug ID: 84447 Summary: [8 Regression] ICE with inherited deleted constructor and default argument Product: gcc Version: 8.0 Status: UNCONFIRMED Keywords: ice-on-invalid-code Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: reichelt at gcc dot gnu.org Target Milestone: --- The following invalid code snippet triggers an ICE on trunk: ================================================= struct A { template<typename T> A(T, T = 0) = delete; }; struct B : A { using A::A; }; B b(0); ================================================= bug.cc:11:6: internal compiler error: in tsubst_default_argument, at cp/pt.c:12184 B b(0); ^ 0x6384c6 tsubst_default_argument(tree_node*, int, tree_node*, tree_node*, int) ../../gcc/gcc/cp/pt.c:12184 0x819794 convert_default_arg(tree_node*, tree_node*, tree_node*, int, int) ../../gcc/gcc/cp/call.c:7336 0x81a708 build_over_call ../../gcc/gcc/cp/call.c:7949 0x81d803 build_new_method_call_1 ../../gcc/gcc/cp/call.c:9280 0x81d803 build_new_method_call(tree_node*, tree_node*, vec<tree_node*, va_gc, vl_embed>**, tree_node*, int, tree_node**, int) ../../gcc/gcc/cp/call.c:9355 0x81e363 build_special_member_call(tree_node*, tree_node*, vec<tree_node*, va_gc, vl_embed>**, tree_node*, int, int) ../../gcc/gcc/cp/call.c:8883 0x8cc4e3 expand_default_init ../../gcc/gcc/cp/init.c:1889 0x8cc4e3 expand_aggr_init_1 ../../gcc/gcc/cp/init.c:2004 0x8cce49 build_aggr_init(tree_node*, tree_node*, int, int) ../../gcc/gcc/cp/init.c:1744 0x881b5f build_aggr_init_full_exprs ../../gcc/gcc/cp/decl.c:6188 0x881b5f check_initializer ../../gcc/gcc/cp/decl.c:6337 0x8996cc cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int) ../../gcc/gcc/cp/decl.c:7038 0x934883 cp_parser_init_declarator ../../gcc/gcc/cp/parser.c:19697 0x93bc78 cp_parser_simple_declaration ../../gcc/gcc/cp/parser.c:13038 0x93ca88 cp_parser_block_declaration ../../gcc/gcc/cp/parser.c:12863 0x9409e2 cp_parser_declaration ../../gcc/gcc/cp/parser.c:12761 0x940df1 cp_parser_declaration_seq_opt ../../gcc/gcc/cp/parser.c:12637 0x9410e4 cp_parser_translation_unit ../../gcc/gcc/cp/parser.c:4559 0x9410e4 c_parse_file() ../../gcc/gcc/cp/parser.c:38860 0xa3f396 c_common_parse_file() ../../gcc/gcc/c-family/c-opts.c:1132 Please submit a full bug report, [etc.] The regression was introduced between 2017-08-19 and 2017-09-02.