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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++/106259] [10/11/12/13 Regression] ICE in
 diag_mismatched_tags, at cp/parser.cc:33896
Date: Wed, 01 Mar 2023 17:05:45 +0000
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X-Bugzilla-Keywords: ice-on-valid-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106259

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |mpolacek at gcc dot=
 gnu.org

--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Ah, this does what I want:

--- a/gcc/cp/parser.cc
+++ b/gcc/cp/parser.cc
@@ -34473,6 +34473,12 @@ class_decl_loc_t::diag_mismatched_tags (tree
type_decl)
     be (and inevitably is) at index zero.  */
       tree spec =3D specialization_of (type);
       cdlguide =3D class2loc.get (spec);
+      if (!cdlguide)
+   {
+     spec =3D most_general_template (spec);
+     spec =3D TYPE_MAIN_DECL (TREE_TYPE (spec));
+     cdlguide =3D class2loc.get (spec);
+   }
       gcc_assert (cdlguide !=3D NULL);
     }
   else=