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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/112633] [13/14 Regression] ICE with type aliases and
 depedent value
Date: Mon, 20 Nov 2023 06:47:38 +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: 13.1.0
X-Bugzilla-Keywords: ice-on-valid-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
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X-Bugzilla-Target-Milestone: 13.3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112633

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-valid-code
            Version|13.0                        |13.1.0
            Summary|ICE in parser GCC 13+       |[13/14 Regression] ICE with
                   |(including 14) around type  |type aliases and depedent
                   |aliases                     |value
   Target Milestone|---                         |13.3

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed, note this is not related to variadic templates as this crashes i=
n a
similar way:
```
template <class> constexpr bool dependent_true =3D true;

template <bool> struct empty_type { }; // something like enable_if

template <bool B> using empty_type_t =3D typename empty_type<B>::type;=20

struct wrapper {
    using type =3D void;
};

template <class> using all =3D wrapper;

template <class Conditions>
using constraints =3D typename all<Conditions>::type;

template <typename T, constraints<empty_type_t<dependent_true<T>>> =3D null=
ptr>=20
void calculate() { };
```=