[Bug c++/67339] New: Segfault when parsing a typename involving a template-alias

[roger.ferrer at bsc dot es]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67339

            Bug ID: 67339
           Summary: Segfault when parsing a typename involving a
                    template-alias
           Product: gcc
           Version: 5.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: roger.ferrer at bsc dot es
  Target Milestone: ---

Created attachment 36250
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36250&action=edit
Small testcase

Hi,

the following snippet crashes in trunk (6.0.0 20150824).


-- test.ii
template < typename T>
struct A
{
    void foo();
    template < typename S, typename W >
        using N = void (T::*)(S, W) const ;
};

template < typename T>
void A<T>::foo()
{
    typename A<T>::template N<int, int> fun = &T::out;
}
-- end of test.ii


$ g++ --version 
g++ (GCC) 6.0.0 20150824 (experimental)
$ g++ -c test.ii
test.ii: In member function 'void A<T>::foo()':
test.ii:12:29: internal compiler error: Segmentation fault
     typename A<T>::template N<int, int> fun = &T::out;
                             ^
0xc7cf1f crash_signal
        ../../gcc-svn/gcc/toplev.c:352
0x6efffd cp_parser_elaborated_type_specifier
        ../../gcc-svn/gcc/cp/parser.c:16189
0x6de047 cp_parser_type_specifier
        ../../gcc-svn/gcc/cp/parser.c:15104
0x6edf01 cp_parser_decl_specifier_seq
        ../../gcc-svn/gcc/cp/parser.c:12042
0x7025a1 cp_parser_simple_declaration
        ../../gcc-svn/gcc/cp/parser.c:11608
0x6fbf54 cp_parser_block_declaration
        ../../gcc-svn/gcc/cp/parser.c:11555
0x6fcd61 cp_parser_declaration_statement
        ../../gcc-svn/gcc/cp/parser.c:11174
0x6fdb8c cp_parser_statement
        ../../gcc-svn/gcc/cp/parser.c:9894
0x6fe162 cp_parser_statement_seq_opt
        ../../gcc-svn/gcc/cp/parser.c:10172
0x6fe2bb cp_parser_compound_statement
        ../../gcc-svn/gcc/cp/parser.c:10126
0x6fe4eb cp_parser_function_body
        ../../gcc-svn/gcc/cp/parser.c:19783
0x6fe4eb cp_parser_ctor_initializer_opt_and_function_body
        ../../gcc-svn/gcc/cp/parser.c:19819
0x6ff369 cp_parser_function_definition_after_declarator
        ../../gcc-svn/gcc/cp/parser.c:24426
0x70022c cp_parser_function_definition_from_specifiers_and_declarator
        ../../gcc-svn/gcc/cp/parser.c:24338
0x70022c cp_parser_init_declarator
        ../../gcc-svn/gcc/cp/parser.c:17619
0x7005ae cp_parser_single_declaration
        ../../gcc-svn/gcc/cp/parser.c:24868
0x70074b cp_parser_template_declaration_after_parameters
        ../../gcc-svn/gcc/cp/parser.c:24487
0x701334 cp_parser_explicit_template_declaration
        ../../gcc-svn/gcc/cp/parser.c:24722
0x701334 cp_parser_template_declaration_after_export
        ../../gcc-svn/gcc/cp/parser.c:24740
0x708109 cp_parser_declaration
        ../../gcc-svn/gcc/cp/parser.c:11412
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.


It looks like a regression introduced in 5.1: both GCC 5.1.0 and GCC 5.2.0
crash while 4.9.3 works fine.


Best regards,