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From: Gavin Ray <ray.gavin97@gmail.com>
Date: Fri, 18 Nov 2022 13:59:13 -0500
Message-ID: <CAFtvWZM07WNyawZ7-7LNDjsEb0rmF3ra2F-N+y26trsAjQ7cJQ@mail.gmail.com>
Subject: Bug in <complex> header in trunk from malformed "requires" statement,
 causes compilation errors if included
To: libstdc++@gcc.gnu.org
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List-Id: <libstdc++.gcc.gnu.org>

Hello all,

Hit a very confusing bug this morning. I'm using Clang with GCC
upstream libstdc++ from jwakely's repo.
The following program fails to compile:

#include <complex>
int main() { return 0; }

It appears there was an initial commit which added "requires" clauses,
and then a fixup commit later:
- libstdc++: Fix up <complex> for extended floating point types
[PR107649] =C2=B7 gcc-mirror/gcc@0e2c551 (github.com)

But there seems to be one last malformed "requires" statement in trunk:
https://github.com/gcc-mirror/gcc/blob/59cc4da605e5cb8e31e9f1d54ef2b5ba47fc=
8f88/libstdc%2B%2B-v3/include/std/complex#L2531

(Big thanks to Luke D'Alessandro for figuring this all out)
Thought I'd let you folks know.

Thank you!