[Bug c++/92523] Unhelpful error messages when requires-clause contains function call

[boostcpp at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92523

--- Comment #2 from Ryou Ezoe <boostcpp at gmail dot com> ---
That is regression.
The latest HEAD build of the Clang as of now indeed pass that code. But this is
explicitly ill-formed code. parentheses are required.
See 13.1, paragraph 9, Note.