[Bug c++/60390] New: [c++1y] ICE with declaring function with auto parameter as friend

["reichelt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60390

            Bug ID: 60390
           Summary: [c++1y] ICE with declaring function with auto
                    parameter as friend
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: reichelt at gcc dot gnu.org
                CC: abutcher at gcc dot gnu.org

The following valid code snippet (compiled with "-std=c++1y") triggers
an ICE on trunk:

===========================================
struct A
{
  void foo(auto);
};

struct B
{
  friend void A::foo(auto);
};
===========================================

bug.cc:8:26: internal compiler error: in poplevel_class, at
cp/name-lookup.c:2951
   friend void A::foo(auto);
                          ^
0x783a07 poplevel_class()
        ../../gcc/gcc/cp/name-lookup.c:2951
0x667d28 popclass()
        ../../gcc/gcc/cp/class.c:7129
0x66818a pop_nested_class()
        ../../gcc/gcc/cp/class.c:7275
0x6c2cf1 cp_parser_direct_declarator
        ../../gcc/gcc/cp/parser.c:17479
0x6c2cf1 cp_parser_declarator
        ../../gcc/gcc/cp/parser.c:16947
0x6ac38d cp_parser_member_declaration
        ../../gcc/gcc/cp/parser.c:20353
0x6afa74 cp_parser_member_specification_opt
        ../../gcc/gcc/cp/parser.c:20034
0x6afa74 cp_parser_class_specifier_1
        ../../gcc/gcc/cp/parser.c:19268
0x6afa74 cp_parser_class_specifier
        ../../gcc/gcc/cp/parser.c:19495
0x6afa74 cp_parser_type_specifier
        ../../gcc/gcc/cp/parser.c:14305
0x6c8f70 cp_parser_decl_specifier_seq
        ../../gcc/gcc/cp/parser.c:11547
0x6cfb49 cp_parser_simple_declaration
        ../../gcc/gcc/cp/parser.c:11137
0x6b2ff3 cp_parser_block_declaration
        ../../gcc/gcc/cp/parser.c:11086
0x6da2b2 cp_parser_declaration
        ../../gcc/gcc/cp/parser.c:10983
0x6d8fa8 cp_parser_declaration_seq_opt
        ../../gcc/gcc/cp/parser.c:10869
0x6da85a cp_parser_translation_unit
        ../../gcc/gcc/cp/parser.c:4014
0x6da85a c_parse_file()
        ../../gcc/gcc/cp/parser.c:31595
0x7f9f53 c_common_parse_file()
        ../../gcc/gcc/c-family/c-opts.c:1060
Please submit a full bug report, [etc.]

This is similar to PR60064.
Adam, you might want to have a look.