[Bug c++/60250] New: [4.9 Regression] [c++1y] ICE using lambda for array size

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60250

            Bug ID: 60250
           Summary: [4.9 Regression] [c++1y] ICE using lambda for array
                    size
           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

The following valid code snippet (compiled with "-std=c++1y") triggers
an ICE on trunk. The code compiles fine, if it is compiled with
"-std=c++11".

====================================
template<typename> void foo()
{
  typedef int T[ ([](){ return 1; }()) ];
}
====================================

bug.cc: In function 'void foo()':
bug.cc:3:40: internal compiler error: Segmentation fault
   typedef int T[ ([](){ return 1; }()) ];
                                        ^
0xba529f crash_signal
        ../../gcc/gcc/toplev.c:337
0x7422dd potential_constant_expression_1
        ../../gcc/gcc/cp/semantics.c:10140
0x741680 potential_constant_expression_1
        ../../gcc/gcc/cp/semantics.c:10495
0x74d0dd array_of_runtime_bound_p(tree_node*)
        ../../gcc/gcc/cp/tree.c:892
0x5e9656 grokdeclarator(cp_declarator const*, cp_decl_specifier_seq*,
decl_context, int, tree_node**)
        ../../gcc/gcc/cp/decl.c:10174
0x5edc24 start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
        ../../gcc/gcc/cp/decl.c:4508
0x6c7e8e cp_parser_init_declarator
        ../../gcc/gcc/cp/parser.c:16680
0x6c9919 cp_parser_simple_declaration
        ../../gcc/gcc/cp/parser.c:11205
0x6acc03 cp_parser_block_declaration
        ../../gcc/gcc/cp/parser.c:11086
0x6add21 cp_parser_declaration_statement
        ../../gcc/gcc/cp/parser.c:10733
0x6ae36b cp_parser_statement
        ../../gcc/gcc/cp/parser.c:9467
0x6af159 cp_parser_statement_seq_opt
        ../../gcc/gcc/cp/parser.c:9745
0x6af2c6 cp_parser_compound_statement
        ../../gcc/gcc/cp/parser.c:9699
0x6c349b cp_parser_function_body
        ../../gcc/gcc/cp/parser.c:18641
0x6c349b cp_parser_ctor_initializer_opt_and_function_body
        ../../gcc/gcc/cp/parser.c:18677
0x6c77e2 cp_parser_function_definition_after_declarator
        ../../gcc/gcc/cp/parser.c:22792
0x6c8681 cp_parser_function_definition_from_specifiers_and_declarator
        ../../gcc/gcc/cp/parser.c:22704
0x6c8681 cp_parser_init_declarator
        ../../gcc/gcc/cp/parser.c:16585
0x6c8a1a cp_parser_single_declaration
        ../../gcc/gcc/cp/parser.c:23113
0x6c8d04 cp_parser_template_declaration_after_export
        ../../gcc/gcc/cp/parser.c:22915
Please submit a full bug report, [etc.]