https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87814
--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I actually still see an ICE in tsubst_copy:
h.C: In instantiation of ‘constexpr adaptor_cursor::adaptor_cursor(Args&& ...)
[with Args = {int*}][inherited from compressed_tuple_<int*>]’:
h.C:24:43: required from here
h.C:20:30: internal compiler error: in tsubst_copy, at cp/pt.c:16090
20 | using compressed_tuple_::compressed_tuple_;
| ^~~~~~~~~~~~~~~~~
0x80b870 tsubst_copy
/home/mpolacek/src/gcc/gcc/cp/pt.c:16090
0xa3cbc2 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
/home/mpolacek/src/gcc/gcc/cp/pt.c:19160
0xa4286b tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
/home/mpolacek/src/gcc/gcc/cp/pt.c:17862
0xa4286b tsubst_exception_specification
/home/mpolacek/src/gcc/gcc/cp/pt.c:14231
0xa509b4 regenerate_decl_from_template
/home/mpolacek/src/gcc/gcc/cp/pt.c:23584
0xa509b4 instantiate_decl(tree_node*, bool, bool)
/home/mpolacek/src/gcc/gcc/cp/pt.c:24154
0x8e74c9 instantiate_cx_fn_r
/home/mpolacek/src/gcc/gcc/cp/constexpr.c:4944
