From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id E13453857C7E; Fri, 16 Apr 2021 08:17:32 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org E13453857C7E
From: "hewillk at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/99809] ICE: sorry, unimplemented: unexpected AST of kind
 nontype_argument_pack
Date: Fri, 16 Apr 2021 08:17:32 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: ice-on-invalid-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: hewillk at gmail dot com
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-99809-4-zjf8UFNE2P@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-99809-4@http.gcc.gnu.org/bugzilla/>
References: <bug-99809-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Fri, 16 Apr 2021 08:17:33 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99809

--- Comment #4 from =E5=BA=B7=E6=A1=93=E7=91=8B <hewillk at gmail dot com> =
---
Hey, the following code (a small variation with PR 100109) triggers the same
ICE in cp/constexpr.c:8889 on gcc 8-11, so maybe this is a regression bug?

template <class... Ts>
void f(Ts... args) {
  [=3D]{
    enum { x =3D [=3D]{ args; }() };
  };
}

template void f<>();

<source>: In instantiation of 'void f(Ts ...) [with Ts =3D {}]':
<source>:8:19:   required from here
<source>:4:16: sorry, unimplemented: unexpected AST of kind
nontype_argument_pack
    4 |     enum { x =3D [=3D]{ args; }() };
      |                ^~~~~~~~~~~~
<source>:4:16: internal compiler error: in potential_constant_expression_1,=
 at
cp/constexpr.c:8889
0x1d02fb9 internal_error(char const*, ...)
        ???:0
0x6bb4f9 fancy_abort(char const*, int, char const*)
        ???:0
0x72a64f potential_constant_expression(tree_node*)
        ???:0
0x7b11c5 finish_function(bool)
        ???:0
0x80714a finish_lambda_function(tree_node*)
        ???:0
0x94ba0b tsubst_lambda_expr(tree_node*, tree_node*, int, tree_node*)
        ???:0
0x92c502 lookup_template_class(tree_node*, tree_node*, tree_node*, tree_nod=
e*,
int, int)
        ???:0
0x91848d tsubst(tree_node*, tree_node*, int, tree_node*)
        ???:0
0x918537 tsubst(tree_node*, tree_node*, int, tree_node*)
        ???:0
0x94ba02 tsubst_lambda_expr(tree_node*, tree_node*, int, tree_node*)
        ???:0
0x91e36f instantiate_decl(tree_node*, bool, bool)
        ???:0
0x96023b instantiate_pending_templates(int)
        ???:0
0x7cd659 c_parse_final_cleanups()
        ???:0
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.=