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From: "jwjagersma at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/107417] New: g++ fails to recognize parameter pack in requires-expression
Date: Wed, 26 Oct 2022 15:25:14 +0000	[thread overview]
Message-ID: <bug-107417-4@http.gcc.gnu.org/bugzilla/> (raw)

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107417

            Bug ID: 107417
           Summary: g++ fails to recognize parameter pack in
                    requires-expression
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jwjagersma at gmail dot com
  Target Milestone: ---

Given the following code:

  $ cat fold.cpp
  template<typename... T>
  requires (requires (T x) { x; } and ...)
  auto func(T...) { }

g++ seems to forget that T is a parameter pack:

  $ g++ -std=c++20 fold.cpp
  fold.cpp:2:11: error: operand of fold expression has no unexpanded parameter
packs
      2 | requires (requires (T x) { x; } and ...)
        |           ^~~~~~~~~~~~~~~~~~~~~

This issue is present on both 12.2 and latest 13.0.  Clang and msvc do accept
it.

             reply	other threads:[~2022-10-26 15:25 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-26 15:25 jwjagersma at gmail dot com [this message]
2022-10-26 16:32 ` [Bug c++/107417] " redi at gcc dot gnu.org
2022-10-26 19:06 ` ppalka at gcc dot gnu.org
2022-12-04 15:47 ` cvs-commit at gcc dot gnu.org
2022-12-04 15:47 ` ppalka at gcc dot gnu.org
2022-12-19 16:54 ` cvs-commit at gcc dot gnu.org
2022-12-19 16:56 ` ppalka at gcc dot gnu.org

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