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From: "hewillk at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/100007] New: Parameter packs not expanded with bit field
Date: Fri, 09 Apr 2021 18:17:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100007

            Bug ID: 100007
           Summary: Parameter packs not expanded with bit field
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hewillk at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/ccb69heP9

template <int... Ns>
auto f() {
  ([] { struct U { int x : Ns; }; }, ...);
  ([] { union  U { int x : Ns; }; }, ...);
}

gcc rejects it.=