[Bug c++/60190] New: [c++1y] ICE with invalid return type of template lambda

[reichelt at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60190

            Bug ID: 60190
           Summary: [c++1y] ICE with invalid return type of template
                    lambda
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: reichelt at gcc dot gnu.org

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

======================================
auto f = []<int>() -> int() {};
======================================

bug.cc:1:27: error: 'operator()' declared as function returning a function
 auto f = []<int>() -> int() {};
                           ^
bug.cc:1:29: internal compiler error: in poplevel_class, at
cp/name-lookup.c:2951
 auto f = []<int>() -> int() {};
                             ^
0x77d247 poplevel_class()
        ../../gcc/gcc/cp/name-lookup.c:2951
0x6626b8 popclass()
        ../../gcc/gcc/cp/class.c:7127
0x67756d finish_struct(tree_node*, tree_node*)
        ../../gcc/gcc/cp/class.c:6808
0x6b08a7 cp_parser_lambda_expression
        ../../gcc/gcc/cp/parser.c:8768
0x6b08a7 cp_parser_primary_expression
        ../../gcc/gcc/cp/parser.c:4305
0x6b20ed cp_parser_postfix_expression
        ../../gcc/gcc/cp/parser.c:5971
0x6b50c6 cp_parser_unary_expression
        ../../gcc/gcc/cp/parser.c:7170
0x6b5def cp_parser_binary_expression
        ../../gcc/gcc/cp/parser.c:7874
0x6b62e1 cp_parser_assignment_expression
        ../../gcc/gcc/cp/parser.c:8112
0x6b67a5 cp_parser_assignment_expression
        ../../gcc/gcc/cp/parser.c:8162
0x6b67a5 cp_parser_constant_expression
        ../../gcc/gcc/cp/parser.c:8372
0x6c82ce cp_parser_init_declarator
        ../../gcc/gcc/cp/parser.c:16758
0x6c9929 cp_parser_simple_declaration
        ../../gcc/gcc/cp/parser.c:11205
0x6acc13 cp_parser_block_declaration
        ../../gcc/gcc/cp/parser.c:11086
0x6d3ec2 cp_parser_declaration
        ../../gcc/gcc/cp/parser.c:10983
0x6d2bb8 cp_parser_declaration_seq_opt
        ../../gcc/gcc/cp/parser.c:10869
0x6d445a cp_parser_translation_unit
        ../../gcc/gcc/cp/parser.c:4014
0x6d445a c_parse_file()
        ../../gcc/gcc/cp/parser.c:31536
0x7f37c3 c_common_parse_file()
        ../../gcc/gcc/c-family/c-opts.c:1060
Please submit a full bug report, [etc.]