https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95932
Bug ID: 95932
Summary: ICE in redeclare_class_template, at cp/pt.c:6231
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Keywords: ice-on-invalid-code
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: haoxintu at gmail dot com
Target Milestone: ---
This code, bug.cc, reduced by C-Reduce, makes GCC-trunk ICE.
$cat bug.cc
template <template>> struct a < class b{}, struct b {
$g++ bug.cc
bug.cc:1:19: error: expected ‘<’ before ‘>>’ token
1 | template <template>> struct a < class b{}, struct b {
| ^~
bug.cc:1:19: error: expected identifier before ‘>>’ token
bug.cc:1:19: error: expected ‘>’ before ‘>>’ token
bug.cc:1:19: error: expected ‘class’ or ‘typename’ before ‘>>’ token
bug.cc:1:19: error: expected identifier before ‘>>’ token
bug.cc:1:19: error: expected ‘>’ before ‘>>’ token
bug.cc:1:29: error: ‘a’ is not a class template
1 | template <template>> struct a < class b{}, struct b {
| ^
bug.cc:1:40: error: types may not be defined in template arguments
1 | template <template>> struct a < class b{}, struct b {
| ^
bug.cc:1:51: internal compiler error: in redeclare_class_template, at
cp/pt.c:6231
1 | template <template>> struct a < class b{}, struct b {
| ^
0x652319 redeclare_class_template(tree_node*, tree_node*, tree_node*)
../../gcc/cp/pt.c:6231
0x8fb2e7 xref_tag_1
../../gcc/cp/decl.c:15043
0x8fb440 xref_tag(tag_types, tree_node*, tag_scope, bool)
../../gcc/cp/decl.c:15085
0x9a1584 cp_parser_class_head
../../gcc/cp/parser.c:24658
0x9a1584 cp_parser_class_specifier_1
../../gcc/cp/parser.c:23880
0x9a1aa3 cp_parser_class_specifier
../../gcc/cp/parser.c:24254
0x9a1aa3 cp_parser_type_specifier
../../gcc/cp/parser.c:17762
0x9b6b53 cp_parser_type_specifier_seq
../../gcc/cp/parser.c:22439
0x9afa94 cp_parser_type_id_1
../../gcc/cp/parser.c:22256
0x9b2603 cp_parser_template_type_arg
../../gcc/cp/parser.c:22347
0x9b6ccf cp_parser_template_argument
../../gcc/cp/parser.c:17235
0x9b6ccf cp_parser_template_argument_list
../../gcc/cp/parser.c:17146
0x9b6ccf cp_parser_enclosed_template_argument_list
../../gcc/cp/parser.c:29832
0x9b8cd0 cp_parser_check_for_invalid_template_id
../../gcc/cp/parser.c:3202
0x99ff18 cp_parser_check_for_invalid_template_id
../../gcc/cp/parser.c:3181
0x99ff18 cp_parser_class_head
../../gcc/cp/parser.c:24437
0x99ff18 cp_parser_class_specifier_1
../../gcc/cp/parser.c:23880
0x9a1aa3 cp_parser_class_specifier
../../gcc/cp/parser.c:24254
0x9a1aa3 cp_parser_type_specifier
../../gcc/cp/parser.c:17762
0x9a2a02 cp_parser_decl_specifier_seq
../../gcc/cp/parser.c:14410
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 20200626 (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.
