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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/100589] function with trailing return type must specify
 return type 'auto' instead of 'concept auto'
Date: Fri, 14 May 2021 09:26:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100589

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-05-14
           Keywords|                            |accepts-invalid
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Please provide the testcase here, not just via a URL, as requested by
https://gcc.gnu.org/bugs/.

Here's the code, which is accepted with -std=3Dc++20 but shouldn't be:

template<class T>
concept false_concept =3D false;

false_concept auto f() -> int;=