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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++/104567] SFINAE check failure with trying to access member
 field
Date: Wed, 16 Feb 2022 22:58:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104567

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |rejects-valid
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
      Known to fail|                            |4.1.2, 4.6.4
   Last reconfirmed|                            |2022-02-16
            Summary|SFINAE check failure        |SFINAE check failure with
                   |starting gcc 4.7.1 and up   |trying to access member
                   |with -std=3Dc++11             |field

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Actually it has always failed.
Here is a C++98 testcase which shows the issue even with GCC 4.1.2:
template <typename _TAny, char const* value =3D _TAny::param>
bool has_char_static_param(int)
    { return true; }

template <typename _TAny>
bool has_char_static_param(...)
    { return false; }

struct checked_type
{
    int param;
};

int main()
{
    int t =3D has_char_static_param<checked_type>(0);
    return t;
}=