[Bug c++/84092] New: ICE on C++14 code with variable template: in build_qualified_name, at cp/tree.c:2043

["su at cs dot ucdavis.edu" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84092

            Bug ID: 84092
           Summary: ICE on C++14 code with variable template: in
                    build_qualified_name, at cp/tree.c:2043
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu
  Target Milestone: ---

This appears to be a recent regression. 

$ g++tk -v
Using built-in specs.
COLLECT_GCC=g++tk
COLLECT_LTO_WRAPPER=/home/su/software/tmp/gcc/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/8.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/home/su/software/tmp/gcc/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 8.0.1 20180129 (experimental) [trunk revision 257134] (GCC) 
$ 
$ g++-7.2.0 -c tmp.cpp
$ 
$ g++tk -c tmp.cpp
tmp.cpp:1:44: internal compiler error: in build_qualified_name, at
cp/tree.c:2043
 template < typename T > int a (T::template b);
                                            ^
0x8dffb4 build_qualified_name(tree_node*, tree_node*, tree_node*, bool)
        ../../gcc-source-trunk/gcc/cp/tree.c:2043
0x8c9631 finish_qualified_id_expr(tree_node*, tree_node*, bool, bool, bool,
bool, int)
        ../../gcc-source-trunk/gcc/cp/semantics.c:2074
0x8ca073 finish_id_expression(tree_node*, tree_node*, tree_node*, cp_id_kind*,
bool, bool, bool*, bool, bool, bool, bool, char const**, unsigned int)
        ../../gcc-source-trunk/gcc/cp/semantics.c:3704
0x80b102 cp_parser_primary_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:5615
0x8183a3 cp_parser_postfix_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:7029
0x82180c cp_parser_unary_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:8281
0x7fb7c9 cp_parser_cast_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:9049
0x7fbec5 cp_parser_binary_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:9151
0x7fc7b0 cp_parser_assignment_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:9439
0x7fd7a3 cp_parser_constant_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:9721
0x7ffb9a cp_parser_parenthesized_expression_list
        ../../gcc-source-trunk/gcc/cp/parser.c:7718
0x800c7c cp_parser_initializer
        ../../gcc-source-trunk/gcc/cp/parser.c:21798
0x823744 cp_parser_init_declarator
        ../../gcc-source-trunk/gcc/cp/parser.c:19611
0x8240c1 cp_parser_single_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:27111
0x8241fc cp_parser_template_declaration_after_parameters
        ../../gcc-source-trunk/gcc/cp/parser.c:26710
0x824b23 cp_parser_explicit_template_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:26944
0x824b23 cp_parser_template_declaration_after_export
        ../../gcc-source-trunk/gcc/cp/parser.c:26962
0x8318f9 cp_parser_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:12673
0x830424 cp_parser_declaration_seq_opt
        ../../gcc-source-trunk/gcc/cp/parser.c:12600
0x830767 cp_parser_translation_unit
        ../../gcc-source-trunk/gcc/cp/parser.c:4559
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$ 


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template < typename T > int a (T::template b);