https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119732
--- Comment #1 from Matthias Kretz (Vir) <mkretz at gcc dot gnu.org> ---
After rebuilding GCC with checking enabled I get the following trace:
constexpr.core2.ii: In instantiation of ‘array convert_mask() [with _Tp =
array]’:
constexpr.core2.ii:10:22: required from here
10 | convert_mask<array>();
| ~~~~~~~~~~~~~~~~~~~^~
constexpr.core2.ii:5:66: internal compiler error: in tsubst_pack_expansion, at
cp/pt.cc:13924
5 | return {[]<int... _Js> { Impl0_convert_mask<_Tp>(_Js); }()...};
| ^
0x298a05f internal_error(char const*, ...)
/home/mkretz/src/gcc-master/gcc/diagnostic-global-context.cc:517
0xaf4ee3 fancy_abort(char const*, int, char const*)
/home/mkretz/src/gcc-master/gcc/diagnostic.cc:1749
0x8a0699 tsubst_pack_expansion(tree_node*, tree_node*, int, tree_node*)
/home/mkretz/src/gcc-master/gcc/cp/pt.cc:13924
0xd5c4f9 tsubst_expr(tree_node*, tree_node*, int, tree_node*)
/home/mkretz/src/gcc-master/gcc/cp/pt.cc:21856
0xd49ee0 tsubst_stmt
/home/mkretz/src/gcc-master/gcc/cp/pt.cc:20012
0xd4b8b4 tsubst_stmt
/home/mkretz/src/gcc-master/gcc/cp/pt.cc:18875
0xd4c5a1 tsubst_stmt
/home/mkretz/src/gcc-master/gcc/cp/pt.cc:18865
0xd4acb6 tsubst_stmt
/home/mkretz/src/gcc-master/gcc/cp/pt.cc:19230
0xd73a56 tsubst_stmt
/home/mkretz/src/gcc-master/gcc/cp/pt.cc:18851
0xd73a56 instantiate_body
/home/mkretz/src/gcc-master/gcc/cp/pt.cc:27729
0xd49acc instantiate_decl(tree_node*, bool, bool)
/home/mkretz/src/gcc-master/gcc/cp/pt.cc:28013
0xd83aeb instantiate_pending_templates(int)
/home/mkretz/src/gcc-master/gcc/cp/pt.cc:28090
0xc03562 c_parse_final_cleanups()
/home/mkretz/src/gcc-master/gcc/cp/decl2.cc:5571
0xe812f0 c_common_parse_file()
/home/mkretz/src/gcc-master/gcc/c-family/c-opts.cc:1397
