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Subject: [Bug c++/97511] [11 Regression] ICE in template_parm_to_arg, at
 cp/pt.c:4744 since r11-3296-ge5d72c840a226fdb
Date: Thu, 22 Oct 2020 11:34:22 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97511

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppalka@gcc.gnu.org>:

https://gcc.gnu.org/g:b083a14dfe1f53446722f488885078e419238d24

commit r11-4229-gb083a14dfe1f53446722f488885078e419238d24
Author: Patrick Palka <ppalka@redhat.com>
Date:   Thu Oct 22 07:27:55 2020 -0400

    c++: Check DECL_TEMPLATE_PARM_P in duplicate_decls [PR97511]

    This makes duplicate_decls differentiate a TYPE_DECL for an alias
    template from a TYPE_DECL for one of its template parameters.  The
    recently added assert in template_parm_to_arg revealed this latent issue
    because merging of the two TYPE_DECLs cleared the DECL_TEMPLATE_PARM_P
    flag.

    With this patch, we now also correctly diagnose the name shadowing in
    the below testcase (as required by [temp.local]/6).

    gcc/cp/ChangeLog:

            PR c++/97511
            * decl.c (duplicate_decls): Return NULL_TREE if
            DECL_TEMPLATE_PARM_P differ.

    gcc/testsuite/ChangeLog:

            PR c++/97511
            * g++.dg/template/shadow3.C: New test.=