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From: "hewillk at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/99809] New: ICE: sorry, unimplemented: unexpected AST of
 kind nontype_argument_pack
Date: Mon, 29 Mar 2021 07:15:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99809

            Bug ID: 99809
           Summary: ICE: sorry, unimplemented: unexpected AST of kind
                    nontype_argument_pack
           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/4dnnTTzMW

#include <concepts>

auto f(auto... args) {
  return [](std::same_as<decltype(args)> auto) {};
}

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

<source>:4:10: sorry, unimplemented: unexpected AST of kind
nontype_argument_pack
    4 |   return [](std::same_as<decltype(args)> auto) {};
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<source>:4:10: internal compiler error: in potential_constant_expression_1,=
 at
cp/constexpr.c:8854
0x1cfb7f9 internal_error(char const*, ...)
        ???:0
0x6ba871 fancy_abort(char const*, int, char const*)
        ???:0
0x72ac1e is_nondependent_constant_expression(tree_node*)
        ???:0
0x91465c instantiate_non_dependent_expr_sfinae(tree_node*, int)
        ???:0
0x98afc1 finish_decltype_type(tree_node*, bool, int)
        ???:0
0x915dc3 tsubst(tree_node*, tree_node*, int, tree_node*)
        ???:0
0x941bb6 tsubst_template_args(tree_node*, tree_node*, int, tree_node*)
        ???:0
0x739946 tsubst_constraint(tree_node*, tree_node*, int, tree_node*)
        ???:0
0x949a91 tsubst_lambda_expr(tree_node*, tree_node*, int, tree_node*)
        ???:0
0x91c84f instantiate_decl(tree_node*, bool, bool)
        ???:0
0x7c6c0e maybe_instantiate_decl(tree_node*)
        ???:0
0x7c8370 mark_used(tree_node*, int)
        ???:0
0x6de097 build_new_function_call(tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
        ???:0
0x980c6c 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.=