https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77791
Bug ID: 77791 Summary: ICE on invalid C++11 code with redefined function parameter: tree check: expected tree that contains ‘decl minimal’ structure, have ‘error_mark’ in cp_parser_lambda_declarator_opt, at cp/parser.c:1011 Product: gcc Version: 7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: su at cs dot ucdavis.edu Target Milestone: --- It is regression from 6.2.x. $ g++-trunk -v Using built-in specs. COLLECT_GCC=g++-trunk COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto --prefix=/usr/local/gcc-trunk --disable-bootstrap Thread model: posix gcc version 7.0.0 20160928 (experimental) [trunk revision 240585] (GCC) $ $ g++-trunk -std=c++11 -c small.cpp small.cpp:1:29: error: redefinition of ‘int i’ auto a = [] (int i, int i = 0) {}; ^ small.cpp:1:18: note: ‘int i’ previously declared here auto a = [] (int i, int i = 0) {}; ^ small.cpp:1:29: internal compiler error: tree check: expected tree that contains ‘decl minimal’ structure, have ‘error_mark’ in cp_parser_lambda_declarator_opt, at cp/parser.c:10119 auto a = [] (int i, int i = 0) {}; ^ 0x1090e44 tree_contains_struct_check_failed(tree_node const*, tree_node_structure_enum, char const*, int, char const*) ../../gcc-source-trunk/gcc/tree.c:9914 0x7b4612 contains_struct_check ../../gcc-source-trunk/gcc/tree.h:3145 0x7b4612 cp_parser_lambda_declarator_opt ../../gcc-source-trunk/gcc/cp/parser.c:10119 0x792a82 cp_parser_lambda_expression ../../gcc-source-trunk/gcc/cp/parser.c:9779 0x792a82 cp_parser_primary_expression ../../gcc-source-trunk/gcc/cp/parser.c:4966 0x79dbe6 cp_parser_postfix_expression ../../gcc-source-trunk/gcc/cp/parser.c:6724 0x79c01c cp_parser_unary_expression ../../gcc-source-trunk/gcc/cp/parser.c:8019 0x7a5e57 cp_parser_cast_expression ../../gcc-source-trunk/gcc/cp/parser.c:8696 0x7a6455 cp_parser_binary_expression ../../gcc-source-trunk/gcc/cp/parser.c:8798 0x7a6d40 cp_parser_assignment_expression ../../gcc-source-trunk/gcc/cp/parser.c:9086 0x7a717a cp_parser_constant_expression ../../gcc-source-trunk/gcc/cp/parser.c:9354 0x7a7904 cp_parser_initializer_clause ../../gcc-source-trunk/gcc/cp/parser.c:21048 0x7a929b cp_parser_initializer ../../gcc-source-trunk/gcc/cp/parser.c:20986 0x7bb3fc cp_parser_init_declarator ../../gcc-source-trunk/gcc/cp/parser.c:18851 0x7bbb39 cp_parser_simple_declaration ../../gcc-source-trunk/gcc/cp/parser.c:12567 0x7bbe71 cp_parser_block_declaration ../../gcc-source-trunk/gcc/cp/parser.c:12435 0x7c3dd0 cp_parser_declaration ../../gcc-source-trunk/gcc/cp/parser.c:12332 0x7c2914 cp_parser_declaration_seq_opt ../../gcc-source-trunk/gcc/cp/parser.c:12211 0x7c2c58 cp_parser_translation_unit ../../gcc-source-trunk/gcc/cp/parser.c:4356 0x7c2c58 c_parse_file() ../../gcc-source-trunk/gcc/cp/parser.c:37805 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. $ ------------------------------------- auto a = [] (int i, int i = 0) {};