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 583CB3858C66; Thu, 18 Jan 2024 03:47:12 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 583CB3858C66
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1705549632;
	bh=knRtye+pg7h6j7JP9Snb/yL9Zi0StlGbiotzJxFA7qk=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=ASepyw0LQxLeCoe7ojmdgGuGRGttrbycsNv+EEVMYnIpnDCoSzRvlVI/8FAk3gTpF
	 mMmySEpp9GvLGT5sY05uz0V1lZuIDaDc/cuAalEbzRdbxchM8+c6O/pMgj8kzhH63W
	 r+sThAIZhg16oli/F4Gy1RJgvOZ9XlJGC/Y0NcuA=
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/113457] Trying to emulate views::concat with std::generator
 gives ICE on co_yield: "internal compiler error: in
 canonicalize_component_ref, at gimplify.cc"
Date: Thu, 18 Jan 2024 03:47:11 +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: 14.0
X-Bugzilla-Keywords: C++-coroutines, needs-bisection, needs-reduction
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
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-113457-4-azQeTziWpB@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-113457-4@http.gcc.gnu.org/bugzilla/>
References: <bug-113457-4@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
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113457

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So you can reproduce it easier without even vector or array:
```
#include <generator>
using namespace std;
template <ranges::input_range... Ranges>
[[nodiscard]] auto
concat(Ranges&&... ranges) -> generator<double, double>
{
        (co_yield ranges::elements_of(ranges), ...);
}
auto
main() -> int
{
        int const numbers1[] =3D {4, 8, 15, 16, 23, 42};
        double const numbers2[] =3D {4, 8, 15, 16, 23, 42};
        return *concat(numbers1, numbers2).begin();
}

```=