[Bug c++/59629] New: [4.9 Regression] [c++11] ICE with invalid use of auto in lambda function

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59629

            Bug ID: 59629
           Summary: [4.9 Regression] [c++11] ICE with invalid use of auto
                    in lambda function
           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 line (compiled with "-std=c++11")
triggers an ICE on trunk:

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

bug.cc: In lambda function:
bug.cc:1:20: internal compiler error: in synthesize_implicit_template_parm, at
cp/parser.c:31615
 void foo(int i = []{ auto 0; }());
                    ^
0x697e43 synthesize_implicit_template_parm
        ../../gcc/gcc/cp/parser.c:31615
0x697e43 cp_parser_simple_type_specifier
        ../../gcc/gcc/cp/parser.c:14499
0x677d95 cp_parser_type_specifier
        ../../gcc/gcc/cp/parser.c:14375
0x68e8cf cp_parser_decl_specifier_seq
        ../../gcc/gcc/cp/parser.c:11542
0x695459 cp_parser_simple_declaration
        ../../gcc/gcc/cp/parser.c:11132
0x679003 cp_parser_block_declaration
        ../../gcc/gcc/cp/parser.c:11081
0x67a1b0 cp_parser_declaration_statement
        ../../gcc/gcc/cp/parser.c:10728
0x67a7fb cp_parser_statement
        ../../gcc/gcc/cp/parser.c:9462
0x67b5c9 cp_parser_statement_seq_opt
        ../../gcc/gcc/cp/parser.c:9740
0x67ccc0 cp_parser_lambda_body
        ../../gcc/gcc/cp/parser.c:9244
0x67ccc0 cp_parser_lambda_expression
        ../../gcc/gcc/cp/parser.c:8754
0x67ccc0 cp_parser_primary_expression
        ../../gcc/gcc/cp/parser.c:4309
0x67e5da cp_parser_postfix_expression
        ../../gcc/gcc/cp/parser.c:5969
0x681698 cp_parser_unary_expression
        ../../gcc/gcc/cp/parser.c:7170
0x68232f cp_parser_binary_expression
        ../../gcc/gcc/cp/parser.c:7874
0x682821 cp_parser_assignment_expression
        ../../gcc/gcc/cp/parser.c:8112
0x682ce5 cp_parser_assignment_expression
        ../../gcc/gcc/cp/parser.c:8162
0x682ce5 cp_parser_constant_expression
        ../../gcc/gcc/cp/parser.c:8372
0x684258 cp_parser_default_argument
        ../../gcc/gcc/cp/parser.c:18591
0x690f0e cp_parser_parameter_declaration
        ../../gcc/gcc/cp/parser.c:18517
Please submit a full bug report, [etc.]


Adam, this appeared right after your "auto refactoring" patch

2013-11-12  Adam Butcher  <adam@jessamine.co.uk>

    PR c++/58534
    PR c++/58536
    PR c++/58548
    PR c++/58549
    PR c++/58637
    * parser.h (struct cp_parser): New members implicit_template_parms,
    implicit_template_scope and auto_is_implicit_function_template_parm_p.
    * parser.c (add_implicit_template_parms): Refactor as ...
    (synthesize_implicit_template_parm): ... this to append a new template
    type parm to the current template parameter list (introducing a new list
    if necessary).  Removed push_deferring_access_checks.
        [...]

Would you mind having a look?