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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++/106520] 2+ index expressions in build_op_subscript are
 incorrectly interpreted as comma expression
Date: Fri, 05 Aug 2022 20:31:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106520

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
           Keywords|                            |accepts-invalid
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2022-08-05

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
clang diagnostic is better:
<source>:15:4: error: no viable overloaded operator[] for type 'A'
  a[b, 2];
  ~^~~~~
<source>:4:8: note: candidate function not viable: no known conversion from=
 'B'
to 'unsigned int' for 1st argument
  void operator[](unsigned, unsigned);
       ^
<source>:3:8: note: candidate function not viable: requires 1 argument, but=
 2
were provided
  void operator[](unsigned);
       ^

Though it does not do the warning except for C++20.=