https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103706
Bug ID: 103706
Summary: [11/12 Regression] ICE: tree check: accessed elt 1 of
'tree_vec' with 0 elts in hash, at
cp/constraint.cc:2503
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
g++ 12.0.0 20211212 snapshot (g:0b52083ea2c2dd9897031fdc3802a68fd4aa45ef) ICEs
when compiling the following testcase, extracted from
test/SemaTemplate/concepts.cpp, w/ -std=c++20:
namespace PackInTypeConstraint {
template<typename T, typename U> concept C = sizeof(T) == sizeof(int);
template<typename ...T> void g5() {
([]() -> C<T> auto{
return T();
}(), ...);
}
template void g5<int, int, int>();
}
% g++-12.0.0 -std=c++20 -c gpb6lyci.cpp
gpb6lyci.cpp: In instantiation of 'void PackInTypeConstraint::g5() [with T =
{int, int, int}]':
gpb6lyci.cpp:9:35: required from here
gpb6lyci.cpp:6:15: internal compiler error: tree check: accessed elt 1 of
'tree_vec' with 0 elts in hash, at cp/constraint.cc:2503
6 | return T();
| ^
0x869dcd tree_vec_elt_check_failed(int, int, char const*, int, char const*)
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/tree.c:8903
0x996fa5 tree_vec_elt_check(tree_node*, int, char const*, int, char const*)
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/tree.h:3662
0x996fa5 sat_hasher::hash(sat_entry*)
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/constraint.cc:2503
0x992c43 hash_table<sat_hasher, false, xcallocator>::find_slot(sat_entry*
const&, insert_option)
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/hash-table.h:435
0x992c43 satisfaction_cache::satisfaction_cache(tree_node*, tree_node*,
sat_info)
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/constraint.cc:2597
0x995e2e satisfy_atom
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/constraint.cc:2913
0x995e2e satisfy_constraint_r
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/constraint.cc:3022
0x9966d3 satisfy_normalized_constraints
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/constraint.cc:3047
0x99437f satisfy_nondeclaration_constraints
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/constraint.cc:3137
0x99437f constraint_satisfaction_value
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/constraint.cc:3289
0x996794 constraints_satisfied_p(tree_node*, tree_node*)
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/constraint.cc:3321
0xb10490 do_auto_deduction(tree_node*, tree_node*, tree_node*, int,
auto_deduction_context, tree_node*, int)
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/pt.c:30019
0xbbcd18 check_return_expr(tree_node*, bool*)
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/typeck.c:10423
0xb64f7f finish_return_stmt(tree_node*)
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/semantics.c:1193
0xb2bdd8 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/pt.c:18235
0xb2bd7b tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/pt.c:18582
0xb419e6 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/pt.c:18211
0xb419e6 tsubst_lambda_expr(tree_node*, tree_node*, int, tree_node*)
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/pt.c:19583
0xb17eb2 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/pt.c:21074
0xb1638a tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/pt.c:20412
