[Bug c++/82085] Crash: Template variable reference used in nested template alias

["rbock at eudoxos dot de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82085

--- Comment #1 from Roland B <rbock at eudoxos dot de> ---
Forgot to mention:

The command line I used:
/usr/local/gcc-trunk/bin/g++ -std=c++1z -Wall -Wpedantic -Wextra gcc-crash.cpp


Output:
gcc-crash.cpp:8:41: internal compiler error: Segmentation fault
 using type = char_sequence_t<name_of_v<T>>;
                                         ^~
0xe281af crash_signal
        ../../trunk/gcc/toplev.c:341
0x8184ec tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
        ../../trunk/gcc/cp/pt.c:17077
0x81c87b tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
        ../../trunk/gcc/cp/pt.c:16708
0x827552 tsubst_template_args
        ../../trunk/gcc/cp/pt.c:11805
0x82bd2b tsubst(tree_node*, tree_node*, int, tree_node*)
        ../../trunk/gcc/cp/pt.c:13982
0x82c208 tsubst(tree_node*, tree_node*, int, tree_node*)
        ../../trunk/gcc/cp/pt.c:13578
0x83c682 lookup_template_class_1
        ../../trunk/gcc/cp/pt.c:8880
0x83c682 lookup_template_class(tree_node*, tree_node*, tree_node*, tree_node*,
int, int)
        ../../trunk/gcc/cp/pt.c:9130
0x87b93d finish_template_type(tree_node*, tree_node*, int)
        ../../trunk/gcc/cp/semantics.c:3174
0x7dee18 cp_parser_template_id
        ../../trunk/gcc/cp/parser.c:15729
0x7defea cp_parser_class_name
        ../../trunk/gcc/cp/parser.c:22144
0x7d3ee0 cp_parser_qualifying_entity
        ../../trunk/gcc/cp/parser.c:6402
0x7d3ee0 cp_parser_nested_name_specifier_opt
        ../../trunk/gcc/cp/parser.c:6088
0x7ee9e1 cp_parser_simple_type_specifier
        ../../trunk/gcc/cp/parser.c:17055
0x7c9a2d cp_parser_type_specifier
        ../../trunk/gcc/cp/parser.c:16730
0x7ca9b2 cp_parser_type_specifier_seq
        ../../trunk/gcc/cp/parser.c:20976
0x7db074 cp_parser_type_id_1
        ../../trunk/gcc/cp/parser.c:20819
0x7e3e51 cp_parser_type_id
        ../../trunk/gcc/cp/parser.c:20887
0x7e3e51 cp_parser_alias_declaration
        ../../trunk/gcc/cp/parser.c:18803
0x7e9b57 cp_parser_template_declaration_after_parameters
        ../../trunk/gcc/cp/parser.c:26549