[Bug c++/58705] New: [4.7/4.8/4.9 Regression] [c++11] ICE with invalid initializer for _Complex variable

[reichelt at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58705

            Bug ID: 58705
           Summary: [4.7/4.8/4.9 Regression] [c++11] ICE with invalid
                    initializer for _Complex variable
           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 code snippet (compiled with "-std=c++11") triggers an ICE
since GCC 4.7.0:

===============================
_Complex float f = {{}};
===============================

bug.cc:1:23: internal compiler error: Segmentation fault
 _Complex float f = {{}};
                       ^
0xb15dff crash_signal
        ../../gcc/gcc/toplev.c:335
0x5e6d15 vec<constructor_elt_d, va_gc, vl_embed>::operator[](unsigned int)
        ../../gcc/gcc/vec.h:827
0x5e6d15 check_narrowing(tree_node*, tree_node*)
        ../../gcc/gcc/cp/typeck2.c:836
0x55e437 check_initializer
        ../../gcc/gcc/cp/decl.c:5669
0x570ccc cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
        ../../gcc/gcc/cp/decl.c:6356
0x65e7e7 cp_parser_init_declarator
        ../../gcc/gcc/cp/parser.c:16633
0x65ff2f cp_parser_simple_declaration
        ../../gcc/gcc/cp/parser.c:11047
0x643860 cp_parser_block_declaration
        ../../gcc/gcc/cp/parser.c:10928
0x66aaae cp_parser_declaration
        ../../gcc/gcc/cp/parser.c:10825
0x6697ca cp_parser_declaration_seq_opt
        ../../gcc/gcc/cp/parser.c:10711
0x66b0e6 cp_parser_translation_unit
        ../../gcc/gcc/cp/parser.c:3989
0x66b0e6 c_parse_file()
        ../../gcc/gcc/cp/parser.c:30962
0x787f73 c_common_parse_file()
        ../../gcc/gcc/c-family/c-opts.c:1046
Please submit a full bug report, [etc.]