https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101889
Bug ID: 101889 Summary: [11/12 Regression] ICE with template argument deduction of broken template Product: gcc Version: 12.0 Status: UNCONFIRMED Keywords: error-recovery, 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 since GCC 11: ============================== template<int> struct A {}; template<T> struct B { enum { E = 0 }; B(A<E>) {} }; B b = A<0>(); ============================== bug.cc:3:10: error: 'T' has not been declared 3 | template<T> struct B | ^ bug.cc:9:12: internal compiler error: tree check: expected enumeral_type, have error_mark in tsubst_copy, at cp/pt.c:16588 9 | B b = A<0>(); | ^ 0x85a540 tree_check_failed(tree_node const*, char const*, int, char const*, ...) ../../gcc/gcc/tree.c:8686 0x6e74ea tree_check(tree_node*, char const*, int, char const*, tree_code) ../../gcc/gcc/tree.h:3373 0x6e74ea tsubst_copy ../../gcc/gcc/cp/pt.c:16588 0xaf1eb4 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool, bool) ../../gcc/gcc/cp/pt.c:20870 0xafd357 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool) ../../gcc/gcc/cp/pt.c:19092 0xb12264 tsubst_template_args(tree_node*, tree_node*, int, tree_node*) ../../gcc/gcc/cp/pt.c:13355 0xb1b763 tsubst_aggr_type ../../gcc/gcc/cp/pt.c:13559 0xb1be34 tsubst_arg_types ../../gcc/gcc/cp/pt.c:14958 0xb1ed5a tsubst_arg_types ../../gcc/gcc/cp/pt.c:14935 0xb1ed5a build_deduction_guide ../../gcc/gcc/cp/pt.c:28776 0xaec0b6 ctor_deduction_guides_for ../../gcc/gcc/cp/pt.c:29184 0xaec0b6 deduction_guides_for ../../gcc/gcc/cp/pt.c:29257 0xaec576 do_class_deduction ../../gcc/gcc/cp/pt.c:29378 0xaec576 do_auto_deduction(tree_node*, tree_node*, tree_node*, int, auto_deduction_context, tree_node*, int) ../../gcc/gcc/cp/pt.c:29535 0x9d9608 cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int) ../../gcc/gcc/cp/decl.c:7856 0xac5174 cp_parser_init_declarator ../../gcc/gcc/cp/parser.c:22556 0xaa0773 cp_parser_simple_declaration ../../gcc/gcc/cp/parser.c:15088 0xacfdb5 cp_parser_declaration ../../gcc/gcc/cp/parser.c:14787 0xad078e cp_parser_toplevel_declaration ../../gcc/gcc/cp/parser.c:14808 0xad078e cp_parser_translation_unit ../../gcc/gcc/cp/parser.c:4978 Please submit a full bug report, [etc.]