https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79056
Volker Reichelt <reichelt at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |error-recovery
Last reconfirmed|2017-01-30 00:00:00 |2017-06-05
Summary|[C++17] ICE with broken |[7/8 Regression] [C++17]
|deduction guide |ICE with broken deduction
| |guide / broken template
| |parameter
--- Comment #3 from Volker Reichelt <reichelt at gcc dot gnu.org> ---
While Martin's example doesn't ICE for me, the following code snippet
crashes with a very similar stack trace (when using -std=c++1z).
Btw, it only takes a single space to make it valid:
===================================================
template<typename> struct A {};
template<typename T> void foo(A<T>=A<T>()) {}
void bar()
{
foo(A<int>());
}
===================================================
PR79056.cc:3:41: error: template argument 1 is invalid
template<typename T> void foo(A<T>=A<T>()) {}
^
PR79056.cc:3:41: error: template argument 1 is invalid
PR79056.cc:3:41: error: template argument 1 is invalid
PR79056.cc:3:41: error: template argument 1 is invalid
PR79056.cc:3:31: internal compiler error: Segmentation fault
template<typename T> void foo(A<T>=A<T>()) {}
^
0xd724ef crash_signal
../../gcc/gcc/toplev.c:337
0x736779 cp_parser_check_for_invalid_template_id
../../gcc/gcc/cp/parser.c:2986
0x7390b5 cp_parser_check_for_invalid_template_id
../../gcc/gcc/cp/parser.c:2984
0x7390b5 cp_parser_simple_type_specifier
../../gcc/gcc/cp/parser.c:16945
0x726c8d cp_parser_type_specifier
../../gcc/gcc/cp/parser.c:16499
0x727eda cp_parser_decl_specifier_seq
../../gcc/gcc/cp/parser.c:13330
0x742d25 cp_parser_parameter_declaration
../../gcc/gcc/cp/parser.c:21183
0x7435ec cp_parser_parameter_declaration_list
../../gcc/gcc/cp/parser.c:20999
0x743a5c cp_parser_parameter_declaration_clause
../../gcc/gcc/cp/parser.c:20922
0x72a471 cp_parser_direct_declarator
../../gcc/gcc/cp/parser.c:19645
0x72a471 cp_parser_declarator
../../gcc/gcc/cp/parser.c:19521
0x72278c cp_parser_init_declarator
../../gcc/gcc/cp/parser.c:19046
0x72381a cp_parser_single_declaration
../../gcc/gcc/cp/parser.c:26719
0x7456dc cp_parser_template_declaration_after_parameters
../../gcc/gcc/cp/parser.c:26323
0x745364 cp_parser_explicit_template_declaration
../../gcc/gcc/cp/parser.c:26558
0x745364 cp_parser_template_declaration_after_export
../../gcc/gcc/cp/parser.c:26577
0x74d589 cp_parser_declaration
../../gcc/gcc/cp/parser.c:12449
0x74f0ab cp_parser_declaration_seq_opt
../../gcc/gcc/cp/parser.c:12376
0x74f38a cp_parser_translation_unit
../../gcc/gcc/cp/parser.c:4366
0x74f38a c_parse_file()
../../gcc/gcc/cp/parser.c:38431
Please submit a full bug report, [etc.]
This makes it a regression for GCC 7.
