[Bug c++/71385] Internal compiler error when using concept as placeholder

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71385

Martin LiÅka <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-06-14
                 CC|                            |marxin at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Martin LiÅka <marxin at gcc dot gnu.org> ---
Confirmed on current trunk and GCC 6.1.1 with following back-trace:

#35 0x00000000008afe74 in (anonymous namespace)::satisfy_conjunction
(complain=0, in_decl=0x0, args=0x7ffff69e63a0, t=0x7ffff69ef2f8) at
../../gcc/cp/constraint.cc:1936
#36 (anonymous namespace)::satisfy_constraint_1 (t=0x7ffff69ef2f8,
args=args@entry=0x7ffff69e63a0, in_decl=0x0, complain=0) at
../../gcc/cp/constraint.cc:1996
#37 0x00000000008afd2c in (anonymous
namespace)::satisfy_parameterized_constraint (complain=0, in_decl=0x0,
args=0x7ffff69e63a0, t=0x7ffff69ef320) at ../../gcc/cp/constraint.cc:1918
#38 (anonymous namespace)::satisfy_constraint_1 (t=t@entry=0x7ffff69ef320,
args=0x7ffff69e63a0, in_decl=0x0, complain=0) at
../../gcc/cp/constraint.cc:1993
#39 0x00000000008b0277 in (anonymous namespace)::satisfy_constraint
(t=0x7ffff69ef320, args=<optimized out>) at ../../gcc/cp/constraint.cc:2026
#40 0x00000000008b14f5 in constraints_satisfied_p (t=t@entry=0x7ffff69e6360,
args=args@entry=0x7ffff69e63a0) at ../../gcc/cp/constraint.cc:2146
#41 0x00000000006d010b in do_auto_deduction (type=type@entry=0x7ffff69e8f18,
init=init@entry=0x7ffff69ef140, auto_node=auto_node@entry=0x7ffff69e8f18,
complain=complain@entry=0, context=context@entry=adc_requirement) at
../../gcc/cp/pt.c:24084
#42 0x00000000008afe15 in (anonymous
namespace)::satisfy_argument_deduction_constraint (complain=0, in_decl=0x0,
args=0x7ffff69e6300, t=<optimized out>) at ../../gcc/cp/constraint.cc:1879
#43 (anonymous namespace)::satisfy_constraint_1 (t=<optimized out>,
args=args@entry=0x7ffff69e6300, in_decl=0x0, complain=0) at
../../gcc/cp/constraint.cc:1987
#44 0x00000000008afe74 in (anonymous namespace)::satisfy_conjunction
(complain=0, in_decl=0x0, args=0x7ffff69e6300, t=0x7ffff69ef0c8) at
../../gcc/cp/constraint.cc:1936
#45 (anonymous namespace)::satisfy_constraint_1 (t=0x7ffff69ef0c8,
args=args@entry=0x7ffff69e6300, in_decl=0x0, complain=0) at
../../gcc/cp/constraint.cc:1996
#46 0x00000000008afd2c in (anonymous
namespace)::satisfy_parameterized_constraint (complain=0, in_decl=0x0,
args=0x7ffff69e6300, t=0x7ffff69ef0f0) at ../../gcc/cp/constraint.cc:1918
#47 (anonymous namespace)::satisfy_constraint_1 (t=t@entry=0x7ffff69ef0f0,
args=0x7ffff69e6300, in_decl=0x0, complain=0) at
../../gcc/cp/constraint.cc:1993
#48 0x00000000008b0277 in (anonymous namespace)::satisfy_constraint
(t=0x7ffff69ef0f0, args=<optimized out>) at ../../gcc/cp/constraint.cc:2026
#49 0x00000000008b14f5 in constraints_satisfied_p (t=t@entry=0x7ffff69e62c0,
args=args@entry=0x7ffff69e6300) at ../../gcc/cp/constraint.cc:2146
#50 0x00000000006d010b in do_auto_deduction (type=type@entry=0x7ffff69e8f18,
init=0x7ffff68a21f8, auto_node=auto_node@entry=0x7ffff69e8f18,
complain=complain@entry=3, context=context@entry=adc_variable_type) at
../../gcc/cp/pt.c:24084
#51 0x00000000006a4090 in cp_finish_decl (decl=decl@entry=0x7ffff7fedc60,
init=init@entry=0x7ffff68a21f8, init_const_expr_p=true, asmspec_tree=<optimized
out>, asmspec_tree@entry=0x0, flags=5) at ../../gcc/cp/decl.c:6625
#52 0x00000000007a59fe in cp_parser_init_declarator
(parser=parser@entry=0x7ffff7fed990,
decl_specifiers=decl_specifiers@entry=0x7fffffffd300, checks=checks@entry=0x0,
function_definition_allowed_p=function_definition_allowed_p@entry=false, 
    member_p=member_p@entry=false, declares_class_or_enum=<optimized out>,
function_definition_p=0x7fffffffd2ef, maybe_range_for_decl=0x0,
init_loc=0x7fffffffd2f4, auto_result=0x7fffffffd2f8) at
../../gcc/cp/parser.c:18697
#53 0x00000000007a60d2 in cp_parser_simple_declaration
(parser=parser@entry=0x7ffff7fed990, function_definition_allowed_p=false,
maybe_range_for_decl=maybe_range_for_decl@entry=0x0) at
../../gcc/cp/parser.c:12378
#54 0x00000000007a63db in cp_parser_block_declaration (parser=0x7ffff7fed990,
statement_p=statement_p@entry=true) at ../../gcc/cp/parser.c:12246
#55 0x00000000007a6ea9 in cp_parser_declaration_statement
(parser=parser@entry=0x7ffff7fed990) at ../../gcc/cp/parser.c:11858
#56 0x00000000007a388c in cp_parser_statement
(parser=parser@entry=0x7ffff7fed990,
in_statement_expr=in_statement_expr@entry=0x0, in_compound=<optimized out>,
in_compound@entry=true, if_p=if_p@entry=0x0, chain=chain@entry=0x0) at
../../gcc/cp/parser.c:10526
#57 0x00000000007a422d in cp_parser_statement_seq_opt
(parser=parser@entry=0x7ffff7fed990,
in_statement_expr=in_statement_expr@entry=0x0) at ../../gcc/cp/parser.c:10804
#58 0x00000000007a4340 in cp_parser_compound_statement
(parser=parser@entry=0x7ffff7fed990,
in_statement_expr=in_statement_expr@entry=0x0, bcs_flags=bcs_flags@entry=0,
function_body=function_body@entry=true) at ../../gcc/cp/parser.c:10758
#59 0x00000000007a4511 in cp_parser_function_body (in_function_try_block=false,
parser=0x7ffff7fed990) at ../../gcc/cp/parser.c:20696
#60 cp_parser_ctor_initializer_opt_and_function_body
(parser=parser@entry=0x7ffff7fed990,
in_function_try_block=in_function_try_block@entry=false) at
../../gcc/cp/parser.c:20732
#61 0x00000000007a4fd2 in cp_parser_function_definition_after_declarator
(parser=parser@entry=0x7ffff7fed990, inline_p=inline_p@entry=false) at
../../gcc/cp/parser.c:25416
#62 0x00000000007a5db3 in
cp_parser_function_definition_from_specifiers_and_declarator
(declarator=<optimized out>, attributes=0x0, decl_specifiers=0x7fffffffd600,
parser=0x7ffff7fed990) at ../../gcc/cp/parser.c:25328
#63 cp_parser_init_declarator (parser=parser@entry=0x7ffff7fed990,
decl_specifiers=decl_specifiers@entry=0x7fffffffd720, checks=checks@entry=0x0,
function_definition_allowed_p=function_definition_allowed_p@entry=true,
member_p=member_p@entry=false, 
    declares_class_or_enum=<optimized out>,
function_definition_p=0x7fffffffd70f, maybe_range_for_decl=0x0,
init_loc=0x7fffffffd714, auto_result=0x7fffffffd718) at
../../gcc/cp/parser.c:18468
#64 0x00000000007a60d2 in cp_parser_simple_declaration
(parser=parser@entry=0x7ffff7fed990, function_definition_allowed_p=true,
maybe_range_for_decl=maybe_range_for_decl@entry=0x0) at
../../gcc/cp/parser.c:12378
#65 0x00000000007a63db in cp_parser_block_declaration
(parser=parser@entry=0x7ffff7fed990, statement_p=statement_p@entry=false) at
../../gcc/cp/parser.c:12246
---Type <return> to continue, or q <return> to quit---
#66 0x00000000007afd25 in cp_parser_declaration
(parser=parser@entry=0x7ffff7fed990) at ../../gcc/cp/parser.c:12143
#67 0x00000000007ae597 in cp_parser_declaration_seq_opt
(parser=parser@entry=0x7ffff7fed990) at ../../gcc/cp/parser.c:12022
#68 0x00000000007ae8bd in cp_parser_translation_unit (parser=0x7ffff7fed990) at
../../gcc/cp/parser.c:4324
#69 c_parse_file () at ../../gcc/cp/parser.c:37486
#70 0x000000000090d693 in c_common_parse_file () at
../../gcc/c-family/c-opts.c:1064
#71 0x0000000000d8b12f in compile_file () at ../../gcc/toplev.c:465
#72 0x000000000065b3f4 in do_compile () at ../../gcc/toplev.c:1998
#73 toplev::main (this=this@entry=0x7fffffffd9a0, argc=argc@entry=13,
argv=argv@entry=0x7fffffffdaa8) at ../../gcc/toplev.c:2127
#74 0x000000000065d647 in main (argc=13, argv=0x7fffffffdaa8) at
../../gcc/main.c:39