https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102548
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- apinski@xeond:~/src$ ~/upstream-gcc/bin/gcc cmTimestamp.ii -m32 -S E:/Programming/Source/msys2/MINGW-packages/mingw-w64-cmake/src/cmake-3.21.2/Source/cmTimestamp.cxx: In lambda function: E:/Programming/Source/msys2/MINGW-packages/mingw-w64-cmake/src/cmake-3.21.2/Source/cmTimestamp.cxx:208:12: internal compiler error: tree check: expected tree_list, have error_mark in apply_identity_attributes, at cp/tree.c:1499 0x8e5b60 tree_check_failed(tree_node const*, char const*, int, char const*, ...) /home/apinski/src/upstream-gcc/gcc/gcc/tree.c:8689 0x7a8647 tree_check(tree_node*, char const*, int, char const*, tree_code) /home/apinski/src/upstream-gcc/gcc/gcc/tree.h:3427 0x7a8647 apply_identity_attributes /home/apinski/src/upstream-gcc/gcc/gcc/cp/tree.c:1499 0x7a8647 strip_typedefs(tree_node*, bool*, unsigned int) /home/apinski/src/upstream-gcc/gcc/gcc/cp/tree.c:1816 0xc0761d strip_typedefs(tree_node*, bool*, unsigned int) /home/apinski/src/upstream-gcc/gcc/gcc/cp/tree.c:1548 0xc0761d strip_typedefs(tree_node*, bool*, unsigned int) /home/apinski/src/upstream-gcc/gcc/gcc/cp/tree.c:1583 0xb70012 canonicalize_type_argument(tree_node*, int) /home/apinski/src/upstream-gcc/gcc/gcc/cp/pt.c:8176 0xb70012 canonicalize_type_argument(tree_node*, int) /home/apinski/src/upstream-gcc/gcc/gcc/cp/pt.c:8171 0xb9ee42 unify /home/apinski/src/upstream-gcc/gcc/gcc/cp/pt.c:23817 0xb9b288 unify_one_argument /home/apinski/src/upstream-gcc/gcc/gcc/cp/pt.c:22271 0xba877a type_unification_real /home/apinski/src/upstream-gcc/gcc/gcc/cp/pt.c:22390 0xb7f4e0 do_auto_deduction(tree_node*, tree_node*, tree_node*, int, auto_deduction_context, tree_node*, int) /home/apinski/src/upstream-gcc/gcc/gcc/cp/pt.c:29805 0xc2454f check_return_expr(tree_node*, bool*) /home/apinski/src/upstream-gcc/gcc/gcc/cp/typeck.c:10315 0xbd1eaf finish_return_stmt(tree_node*) /home/apinski/src/upstream-gcc/gcc/gcc/cp/semantics.c:1193 0xb34bc5 cp_parser_jump_statement /home/apinski/src/upstream-gcc/gcc/gcc/cp/parser.c:14162 0xb34bc5 cp_parser_statement /home/apinski/src/upstream-gcc/gcc/gcc/cp/parser.c:12172 0xb3583d cp_parser_statement_seq_opt /home/apinski/src/upstream-gcc/gcc/gcc/cp/parser.c:12713 0xb35918 cp_parser_compound_statement /home/apinski/src/upstream-gcc/gcc/gcc/cp/parser.c:12662 0xb36647 cp_parser_function_body /home/apinski/src/upstream-gcc/gcc/gcc/cp/parser.c:24893 0xb36647 cp_parser_lambda_body /home/apinski/src/upstream-gcc/gcc/gcc/cp/parser.c:11654 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.