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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/109859] [12/13/14 Regression] ICE on concept mis-typed as
 template type parameter
Date: Fri, 16 Feb 2024 18:54:22 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109859

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

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

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
We're hitting the assert here:

  /* In a template parameter list, a type-parameter can be introduced
     by type-constraints alone.  */
  if (processing_template_parmlist && !placeholder)
    {
      /* In a default argument we may not be creating new parameters.  */
      if (parser->local_variables_forbidden_p & LOCAL_VARS_FORBIDDEN)
        {
          /* If this assert turns out to be false, do error() instead.  */
          gcc_assert (tentative);
          return error_mark_node;
        }

so presumably we should change it to error() as the comment says.=