https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95672
Bug ID: 95672 Summary: ICE in cxx_incomplete_type_diagnostic, at cp/typeck2.c:584 Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: haoxintu at gmail dot com Target Milestone: --- $cat bug.cc struct g_class : decltype (auto) ... { } ; $g++ bug.cc bug.cc:1:35: internal compiler error: in cxx_incomplete_type_diagnostic, at cp/typeck2.c:584 1 | struct g_class : decltype (auto) ... { } ; | ^~~ 0x5cef74 cxx_incomplete_type_diagnostic(unsigned int, tree_node const*, tree_node const*, diagnostic_t) ../../gcc/cp/typeck2.c:584 0x77b9af cxx_incomplete_type_diagnostic(tree_node const*, tree_node const*, diagnostic_t) ../../gcc/cp/cp-tree.h:7705 0x77b9af complete_type_or_maybe_complain(tree_node*, tree_node*, int) ../../gcc/cp/typeck.c:156 0x77b9af complete_type_or_else(tree_node*, tree_node*) ../../gcc/cp/typeck.c:166 0x685881 xref_basetypes(tree_node*, tree_node*) ../../gcc/cp/decl.c:15099 0x6edfe9 cp_parser_class_head ../../gcc/cp/parser.c:24717 0x6edfe9 cp_parser_class_specifier_1 ../../gcc/cp/parser.c:23874 0x6ee273 cp_parser_class_specifier ../../gcc/cp/parser.c:24248 0x6ee273 cp_parser_type_specifier ../../gcc/cp/parser.c:17762 0x6ef092 cp_parser_decl_specifier_seq ../../gcc/cp/parser.c:14410 0x6efbb1 cp_parser_simple_declaration ../../gcc/cp/parser.c:13664 0x7159c6 cp_parser_declaration ../../gcc/cp/parser.c:13484 0x7160b4 cp_parser_translation_unit ../../gcc/cp/parser.c:4761 0x7160b4 c_parse_file() ../../gcc/cp/parser.c:44034 0x7de74b c_common_parse_file() ../../gcc/c-family/c-opts.c:1190 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <https://gcc.gnu.org/bugs/> for instructions. $g++ --version g++ (GCC) 11.0.0 20200605 (experimental) Copyright (C) 2020 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.