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From: "xmh970252187 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/107260] New: The prvalue with the value 0 that is not a
 integer literal shouldn't convert to std::nullptr_t
Date: Fri, 14 Oct 2022 09:35:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107260

            Bug ID: 107260
           Summary: The prvalue with the value 0 that is not a integer
                    literal shouldn't convert to std::nullptr_t
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: xmh970252187 at gmail dot com
  Target Milestone: ---

[conv.ptr] p1 says
> A null pointer constant is an integer literal ([lex.icon]) with value zer=
o=20

> A null pointer constant of integral type can be converted to a prvalue of=
 type std=E2=80=8B::=E2=80=8Bnullptr_=C2=ADt.

GCC accept this example
````cpp
std::nullptr_t v =3D (int)0;
````
However, the initializer expression is not an integer literal, it is a prva=
lue
of integer type with the value 0. It should be rejected. Clang rejects this
example. https://godbolt.org/z/fxMo4YKE3=