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From: "asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/97511] New: [11 Regression] ICE in template_parm_to_arg, at
 cp/pt.c:4744
Date: Wed, 21 Oct 2020 09:29:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97511

            Bug ID: 97511
           Summary: [11 Regression] ICE in template_parm_to_arg, at
                    cp/pt.c:4744
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---

g++-11.0.0-alpha20201018 snapshot (g:1e70b1a358b6ce3b894f284d88fbb90518d45c=
c0)
ICEs when compiling the following testcase, reduced from
test/SemaCXX/alias-template.cpp from the clang 10.0.1 test suite:

template <typename Z> using Z =3D Z;

% g++-11.0.0 -c bul6e40q.cpp
bul6e40q.cpp:1:34: internal compiler error: in template_parm_to_arg, at
cp/pt.c:4744
    1 | template <typename Z> using Z =3D Z;
      |                                  ^
0x67334e template_parm_to_arg(tree_node*)
=20=20=20=20=20=20=20
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20201018/work/gcc-11-20201018/gc=
c/cp/pt.c:4744
0xa0b849 template_parms_level_to_args(tree_node*)
=20=20=20=20=20=20=20
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20201018/work/gcc-11-20201018/gc=
c/cp/pt.c:4794
0xa0b927 template_parms_to_args(tree_node*)
=20=20=20=20=20=20=20
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20201018/work/gcc-11-20201018/gc=
c/cp/pt.c:4822
0xa4f31f current_template_args
=20=20=20=20=20=20=20
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20201018/work/gcc-11-20201018/gc=
c/cp/pt.c:4839
0xa4f31f push_template_decl(tree_node*, bool)
=20=20=20=20=20=20=20
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20201018/work/gcc-11-20201018/gc=
c/cp/pt.c:5874
0x9436b1 start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
=20=20=20=20=20=20=20
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20201018/work/gcc-11-20201018/gc=
c/cp/decl.c:5398
0x9e200f cp_parser_alias_declaration
=20=20=20=20=20=20=20
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20201018/work/gcc-11-20201018/gc=
c/cp/parser.c:20240
0x9fb82f cp_parser_template_declaration_after_parameters
=20=20=20=20=20=20=20
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20201018/work/gcc-11-20201018/gc=
c/cp/parser.c:29233
0x9fbd00 cp_parser_explicit_template_declaration
=20=20=20=20=20=20=20
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20201018/work/gcc-11-20201018/gc=
c/cp/parser.c:29507
0x9ffa29 cp_parser_declaration
=20=20=20=20=20=20=20
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20201018/work/gcc-11-20201018/gc=
c/cp/parser.c:13524
0xa00010 cp_parser_translation_unit
=20=20=20=20=20=20=20
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20201018/work/gcc-11-20201018/gc=
c/cp/parser.c:4793
0xa00010 c_parse_file()
=20=20=20=20=20=20=20
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20201018/work/gcc-11-20201018/gc=
c/cp/parser.c:44170
0xb2172d c_common_parse_file()
=20=20=20=20=20=20=20
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20201018/work/gcc-11-20201018/gc=
c/c-family/c-opts.c:1188=