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From: "barry.revzin at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/108744] New: error message when trying to use structured
 bindings in static member declaration could be cleaner
Date: Thu, 09 Feb 2023 17:31:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108744

            Bug ID: 108744
           Summary: error message when trying to use structured bindings
                    in static member declaration could be cleaner
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: barry.revzin at gmail dot com
  Target Milestone: ---

Consider:

struct X {
    int i, j;
};

struct C {
    static auto [a, b] =3D X{1, 2};
};


This is ill-formed, but the error is currently:

<source>:6:17: error: expected unqualified-id before '[' token
    6 |     static auto [a, b] =3D X{1, 2};
      |                 ^

clang, in contrast, says:

<source>:6:17: error: decomposition declaration not permitted in this conte=
xt
    static auto [a, b] =3D X{1, 2};
                ^~~~~~

Which is a lot clearer. I think ideally the error states explicitly that
structured bindings can't be used in static data member declarations.=