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From: "schaumb at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/113649] New: ICE: nested template class template argument
 deduction
Date: Mon, 29 Jan 2024 07:57:16 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: schaumb at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113649

            Bug ID: 113649
           Summary: ICE: nested template class template argument deduction
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: schaumb at gmail dot com
  Target Milestone: ---

The following code does not compile, see here https://godbolt.org/z/vz5KMzh=
sh:


template<class ...Ts>
struct params {
    template <typename Return>
    struct return_type {
        constexpr return_type(Return (*p1)(Ts...)){}
    };

    template <typename Return>
    return_type(Return (*)(Ts...)) ->=20
    return_type<Return>;


    template<return_type Any>
    struct addr {};
};

void x(double);

template struct params<double>::addr<&x>;


It runs to internal compiler error:

<source>:19:40: internal compiler error: in build_function_type, at
tree.cc:7488
   19 | template struct params<double>::addr<&x>;
      |                                        ^
0x2647edc internal_error(char const*, ...)
        ???:0
0xa51cb7 fancy_abort(char const*, int, char const*)
        ???:0
0xc72375 do_auto_deduction(tree_node*, tree_node*, tree_node*, int,
auto_deduction_context, tree_node*, int, tree_node*)
        ???:0
0xc76223 coerce_template_parms(tree_node*, tree_node*, tree_node*, int, boo=
l)
        ???:0
0xc93089 lookup_template_class(tree_node*, tree_node*, tree_node*, tree_nod=
e*,
int, int)
        ???:0
0xccf8ff finish_template_type(tree_node*, tree_node*, int)
        ???:0
0xc53d2a c_parse_file()
        ???:0
0xda79a9 c_common_parse_file()
        ???:0
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
Compiler returned: 1=