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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/104608] [12 Regression] internal compiler error: in
 cp_parser_template_id, at cp/parser.cc:18367
Date: Mon, 21 Feb 2022 23:02:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104608

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-valid-code
   Last reconfirmed|2022-02-20 00:00:00         |2022-02-21
   Target Milestone|---                         |12.0
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
            Summary|internal compiler error: in |[12 Regression] internal
                   |cp_parser_template_id, at   |compiler error: in
                   |cp/parser.cc:18367          |cp_parser_template_id, at
                   |                            |cp/parser.cc:18367

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed, reduced testcase:
class Parameter;
template <typename R> class Function=20
: public R=20=20
{
    Function();
};
template <typename R>
Function<R>::Function() {
    this->template Parameter<R>();
}
----- CUT ----
Note it is important that the forward declaration of the class Parameter is
there even.=