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From: "omer.rosler at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/99683] New: Deduction failure when using CTAD of CNTTP
 inside a deduction guide
Date: Sat, 20 Mar 2021 17:27:16 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99683

            Bug ID: 99683
           Summary: Deduction failure when using CTAD of CNTTP inside a
                    deduction guide
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: omer.rosler at gmail dot com
  Target Milestone: ---

The following code causes a deduction failure on gcc and is accepted by cla=
ng.
It happens when using a CTAD for a CNTTP inside an explicit deduction guide.
I'm pretty sure it is legal C++20.

https://godbolt.org/z/Y49T6P=