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From: "rafael at espindo dot la" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/95368] New: gcc things that a lambda capture is both const
 and mutable
Date: Wed, 27 May 2020 15:24:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95368

            Bug ID: 95368
           Summary: gcc things that a lambda capture is both const and
                    mutable
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rafael at espindo dot la
  Target Milestone: ---

gcc accepts

#include <utility>

struct foo {
    void func();
};

void bar(foo& v) {
    [v]() {
        static_assert(std::is_same_v<decltype(v), foo&>);
        [v]() mutable {
            static_assert(std::is_same_v<decltype(v), foo&>);
//            v.func();=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
        }();
    }();
}


But uncomment the call and you get

test.cc:12:20: error: passing =E2=80=98const foo=E2=80=99 as =E2=80=98this=
=E2=80=99 argument discards
qualifiers [-fpermissive]
   12 |             v.func();=