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From: "guojiufu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/105322] [modules] ICE with constexpr object of local class
 type from another function
Date: Thu, 28 Apr 2022 03:54:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105322

Jiu Fu Guo <guojiufu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |guojiufu at gcc dot gnu.org

--- Comment #3 from Jiu Fu Guo <guojiufu at gcc dot gnu.org> ---
One finding:
In trees_out::decl_node, there are code lines:

    case FIELD_DECL:
      {
        if (streaming_p ())
          i (tt_data_member);

        tree ctx =3D DECL_CONTEXT (decl);
        tree_node (ctx); //The context, is the struct "S" inside foo, "S" is
handled in 'tree_node', and "insert" is called for member "d".

        tree name =3D NULL_TREE;

        if (TREE_CODE (decl) =3D=3D USING_DECL)
          ;
        else
          {
            name =3D DECL_NAME (decl);
            if (name && IDENTIFIER_ANON_P (name))
              name =3D NULL_TREE;
          }

        tree_node (name);
        if (!name && streaming_p ())
          {
            unsigned ix =3D get_field_ident (ctx, decl);
            u (ix);
          }

        int tag =3D insert (decl); //HERE, "insert" is called again member =
"d".=20

It may be a direct cause that "insert" is called twice for "d", and then a
crash occurs.

While I do not know much about the code and do not found a fix.=