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From: "hewillk at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/99811] New: ICE: tree check: accessed elt 2 of 'tree_vec'
 with 1 elts in tsubst_pack_expansion, at cp/pt.c:13002
Date: Mon, 29 Mar 2021 07:57:03 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99811

            Bug ID: 99811
           Summary: ICE: tree check: accessed elt 2 of 'tree_vec' with 1
                    elts in tsubst_pack_expansion, at cp/pt.c:13002
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hewillk at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/shj7Tr65M

related to PR 99809:

#include <concepts>

template <typename... Ts>
auto f(Ts...) {
  return []<typename... Us>(std::same_as<Ts> auto...) {};
}

int main() {
  f(0, 0.5)();
}

<source>:9:12: internal compiler error: tree check: accessed elt 2 of
'tree_vec' with 1 elts in tsubst_pack_expansion, at cp/pt.c:13002
    9 |   f(0, 0.5)();
      |   ~~~~~~~~~^~
0x1cfb7f9 internal_error(char const*, ...)
        ???:0
0x67bcb2 tree_vec_elt_check_failed(int, int, char const*, int, char const*)
        ???:0
0x93095c tsubst_pack_expansion(tree_node*, tree_node*, int, tree_node*)
        ???:0
0x73efca constraints_satisfied_p(tree_node*, tree_node*)
        ???:0
0x954963 fn_type_unification(tree_node*, tree_node*, tree_node*, tree_node*
const*, unsigned int, tree_node*, unification_kind_t, int, conversion**, bo=
ol,
bool)
        ???:0
0x6e225e build_op_call(tree_node*, vec<tree_node*, va_gc, vl_embed>**, int)
        ???:0
0x980ae5 finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, b=
ool,
bool, int)
        ???:0
0x8e12ad c_parse_file()
        ???:0
0xa600a2 c_common_parse_file()
        ???:0
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.=