[Bug c++/106311] [12/13 Regression] internal compiler error in redeclare_class_template

[mpolacek at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106311

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Target Milestone|---                         |12.2
           Assignee|unassigned at gcc dot gnu.org      |mpolacek at gcc dot 
gnu.org
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2022-07-15
            Summary|internal compiler error in  |[12/13 Regression] internal
                   |redeclare_class_template    |compiler error in
                   |                            |redeclare_class_template
           Keywords|                            |ice-on-invalid-code
           Priority|P3                          |P2

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r12-7562.  Patch:

--- a/gcc/cp/pt.cc
+++ b/gcc/cp/pt.cc
@@ -6377,7 +6377,8 @@ redeclare_class_template (tree type, tree parms, tree
cons)
    {
      auto_diagnostic_group d;
      error ("template parameter %q+#D", tmpl_parm);
-     inform (DECL_SOURCE_LOCATION (parm), "redeclared here as %q#D", parm);
+     inform (DECL_P (parm) ? DECL_SOURCE_LOCATION (parm) : input_location,
+         "redeclared here as %q#D", parm);
      return false;
    }