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From: "hewillk at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/99869] New: ICE: in do_auto_deduction, at cp/pt.c:29620
Date: Thu, 01 Apr 2021 15:38:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99869

            Bug ID: 99869
           Summary: ICE: in do_auto_deduction, at cp/pt.c:29620
           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: ---

This is a small variant of fixed PR 99815.

https://godbolt.org/z/jezs4qh3E

template <typename...> concept C =3D true;

template <typename... Ts>
auto bar(Ts...) { for (C<Ts...> auto c : ""); }

<source>:4:42: internal compiler error: in do_auto_deduction, at cp/pt.c:29=
620
    4 | auto bar(Ts...) { for (C<Ts...> auto c : ""); }
      |                                          ^~
0x1cfca39 internal_error(char const*, ...)
        ???:0
0x6ba92b fancy_abort(char const*, int, char const*)
        ???:0
0x90a724 do_auto_deduction(tree_node*, tree_node*, tree_node*, int,
auto_deduction_context, tree_node*, int)
        ???:0
0x8e126d c_parse_file()
        ???:0
0xa60292 c_common_parse_file()
        ???:0
Please submit a full bug report,
with preprocessed source if appropriate.=