[Bug c++/59838] New: ICE with an enum using an incomplete type

["ville.voutilainen at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59838

            Bug ID: 59838
           Summary: ICE with an enum using an incomplete type
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ville.voutilainen at gmail dot com

Very simple test:

enum E { a, b = true ? 1 : ((E)a, 0) };

enumcrash.cpp:1:32: internal compiler error: Segmentation fault
 enum E { a, b = true ? 1 : ((E)a, 0) };
                                ^
0xb46faf crash_signal
    ../../gcc/toplev.c:336
0xd65d54 int_fits_type_p(tree_node const*, tree_node const*)
    ../../gcc/tree.c:8566
0x69b53b ocp_convert(tree_node*, tree_node*, int, int, int)
    ../../gcc/cp/cvt.c:756
0x6992e7 cp_build_c_cast(tree_node*, tree_node*, int)
    ../../gcc/cp/typeck.c:7130
0x6565ef cp_parser_binary_expression
    ../../gcc/cp/parser.c:7874
0x656ae1 cp_parser_assignment_expression
    ../../gcc/cp/parser.c:8112
0x658a74 cp_parser_expression
    ../../gcc/cp/parser.c:8274
0x64fe0f cp_parser_primary_expression
    ../../gcc/cp/parser.c:4279
0x65288a cp_parser_postfix_expression
    ../../gcc/cp/parser.c:5969
0x655948 cp_parser_unary_expression
    ../../gcc/cp/parser.c:7170
0x6565ef cp_parser_binary_expression
    ../../gcc/cp/parser.c:7874
0x656ae1 cp_parser_assignment_expression
    ../../gcc/cp/parser.c:8112
0x656dc3 cp_parser_assignment_expression
    ../../gcc/cp/parser.c:8162
0x656dc3 cp_parser_question_colon_clause
    ../../gcc/cp/parser.c:8073
0x656dc3 cp_parser_assignment_expression
    ../../gcc/cp/parser.c:8116
0x656f43 cp_parser_assignment_expression
    ../../gcc/cp/parser.c:8162
0x656f43 cp_parser_constant_expression
    ../../gcc/cp/parser.c:8372
0x65fe12 cp_parser_enumerator_definition
    ../../gcc/cp/parser.c:15634
0x65fe12 cp_parser_enumerator_list
    ../../gcc/cp/parser.c:15581
0x65fe12 cp_parser_enum_specifier
    ../../gcc/cp/parser.c:15507
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.