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From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/112926] New: issues with nested lambdas and decltype of
 uncaptured local variable
Date: Fri, 08 Dec 2023 20:38:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112926

            Bug ID: 112926
           Summary: issues with nested lambdas and decltype of uncaptured
                    local variable
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ppalka at gcc dot gnu.org
  Target Milestone: ---

Here since the outer lambda has no capture-default, using x outside of an
unevaluated operand wouldn't capture it (despite the by-copy capture-defaul=
t of
the inner lambda), so the special case in
https://eel.is/c++draft/expr.prim.id.unqual#3 doesn't apply and decltype((x)
should be int& not const int&.

int main() {
  int x;

  [] {
    [=3D] {
      using type =3D decltype((x)); // should be int& not const int&
      using type =3D int&;
    };
  };
}=