[Bug c++/60628] New: [4.7/4.8/4.9 Regression] [c++11] ICE initializing array of auto

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60628

            Bug ID: 60628
           Summary: [4.7/4.8/4.9 Regression] [c++11] ICE initializing
                    array of auto
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code
          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" or
"-std=c++0x" for older compilers) triggers an ICE since GCC 4.6.0:

=================================
#include <initializer_list>

void foo(int i)
{
  auto x[i] = { 0 };
}
=================================

bug.cc: In function 'void foo(int)':
bug.cc:5:19: internal compiler error: in tsubst_copy, at cp/pt.c:13032
   auto x[i] = { 0 };
                   ^
0x62bba3 tsubst_copy
        ../../gcc/gcc/cp/pt.c:13032
0x60a6a6 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
        ../../gcc/gcc/cp/pt.c:15287
0x614496 tsubst_expr
        ../../gcc/gcc/cp/pt.c:13980
0x61dc56 tsubst(tree_node*, tree_node*, int, tree_node*)
        ../../gcc/gcc/cp/pt.c:11597
0x61cf47 tsubst(tree_node*, tree_node*, int, tree_node*)
        ../../gcc/gcc/cp/pt.c:12046
0x648e17 listify_autos
        ../../gcc/gcc/cp/pt.c:21612
0x648e17 do_auto_deduction(tree_node*, tree_node*, tree_node*)
        ../../gcc/gcc/cp/pt.c:21636
0x5db251 cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
        ../../gcc/gcc/cp/decl.c:6198
0x6cd22d cp_parser_init_declarator
        ../../gcc/gcc/cp/parser.c:16858
0x6ce9e9 cp_parser_simple_declaration
        ../../gcc/gcc/cp/parser.c:11225
0x6b2983 cp_parser_block_declaration
        ../../gcc/gcc/cp/parser.c:11106
0x6b3aa1 cp_parser_declaration_statement
        ../../gcc/gcc/cp/parser.c:10753
0x6b40eb cp_parser_statement
        ../../gcc/gcc/cp/parser.c:9486
0x6b4f39 cp_parser_statement_seq_opt
        ../../gcc/gcc/cp/parser.c:9764
0x6b50a6 cp_parser_compound_statement
        ../../gcc/gcc/cp/parser.c:9718
0x6c62db cp_parser_function_body
        ../../gcc/gcc/cp/parser.c:18736
0x6c62db cp_parser_ctor_initializer_opt_and_function_body
        ../../gcc/gcc/cp/parser.c:18772
0x6cc8b2 cp_parser_function_definition_after_declarator
        ../../gcc/gcc/cp/parser.c:22897
0x6cd75f cp_parser_function_definition_from_specifiers_and_declarator
        ../../gcc/gcc/cp/parser.c:22809
0x6cd75f cp_parser_init_declarator
        ../../gcc/gcc/cp/parser.c:16628
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