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From: "tilkax at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/96311] false positive for -Wunused-but-set-variable
 (const/constexpr identifier used in generic lambda)
Date: Mon, 27 Jul 2020 07:40:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96311

--- Comment #2 from Tillmann Karras <tilkax at gmail dot com> ---
(In reply to Martin Li=C5=A1ka from comment #1)
> Confirmed, but it seems the code is rejected with clang:
> [...]
> Is it a valid test-case?

I think so.

There is a bug report for Clang: https://bugs.llvm.org/show_bug.cgi?id=3D25=
627
And MSVC used to have the same problem:
https://developercommunity.visualstudio.com/content/problem/367326/problems=
-with-capturing-constexpr-in-lambda.html=