https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90764
Bug ID: 90764
Summary: [10 Regression] internal compiler error in
build_deduction_guide, at cp/pt.c:27162
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mpolacek at gcc dot gnu.org
Target Milestone: ---
namespace a {
struct b;
template <typename...> using c = b;
}
template <typename... d> struct e : a::c<d...> { using a::c<>::c; };
template <template <typename> typename f> void g() { f(); }
void h() { g<e>(); }
$ ./cc1plus -quiet ice.cc -std=c++17
ice.cc: In instantiation of ‘void g() [with f = e]’:
ice.cc:7:17: required from here
ice.cc:6:54: internal compiler error: tree check: expected var_decl or
field_decl or function_decl or type_decl or template_decl, have using_decl in
build_deduction_guide, at cp/pt.c:27162
6 | template <template <typename> typename f> void g() { f(); }
| ^~~
0x17ef2dc tree_check_failed(tree_node const*, char const*, int, char const*,
...)
/home/mpolacek/src/gcc/gcc/tree.c:9894
0x871bdc tree_check5(tree_node*, char const*, int, char const*, tree_code,
tree_code, tree_code, tree_code, tree_code)
/home/mpolacek/src/gcc/gcc/tree.h:3285
0xaf6037 build_deduction_guide
/home/mpolacek/src/gcc/gcc/cp/pt.c:27162
0xaf822e do_class_deduction
/home/mpolacek/src/gcc/gcc/cp/pt.c:27394
0xaf8a6e do_auto_deduction(tree_node*, tree_node*, tree_node*, int,
auto_deduction_context, tree_node*, int)
/home/mpolacek/src/gcc/gcc/cp/pt.c:27528
0xba614f build_functional_cast(tree_node*, tree_node*, int)
/home/mpolacek/src/gcc/gcc/cp/typeck2.c:2213
0xacfc76 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
/home/mpolacek/src/gcc/gcc/cp/pt.c:18432
0xacd9f3 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/mpolacek/src/gcc/gcc/cp/pt.c:17923
0xac6683 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/mpolacek/src/gcc/gcc/cp/pt.c:17050
0xac8e7f tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/home/mpolacek/src/gcc/gcc/cp/pt.c:17330
0xaec1fd instantiate_decl(tree_node*, bool, bool)
/home/mpolacek/src/gcc/gcc/cp/pt.c:24769
0xaecbd6 instantiate_pending_templates(int)
/home/mpolacek/src/gcc/gcc/cp/pt.c:24885
0x966d02 c_parse_final_cleanups()
/home/mpolacek/src/gcc/gcc/cp/decl2.c:4821
0xc28828 c_common_parse_file()
/home/mpolacek/src/gcc/gcc/c-family/c-opts.c:1178
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.
