https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84082
Bug ID: 84082
Summary: [7/8 Regression] ICE with broken template function
definition
Product: gcc
Version: 8.0
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
Target Milestone: ---
The follwong invalid code snippet triggers an ICE since GCC 7.1.0:
====================================
struct A;
template<typename> void foo()
[
A().operator=(A());
]
====================================
bug.cc:5:3: warning: invalid use of incomplete type 'struct A'
A().operator=(A());
^~~
bug.cc:1:8: note: forward declaration of 'struct A'
struct A;
^
bug.cc:5:20: internal compiler error: Segmentation fault
A().operator=(A());
^
0xeab52f crash_signal
../../gcc/gcc/toplev.c:325
0x8555b2 contains_struct_check(tree_node*, tree_node_structure_enum, char
const*, int, char const*)
../../gcc/gcc/tree.h:3245
0x8555b2 potential_constant_expression_1
../../gcc/gcc/cp/constexpr.c:5672
0x8560c8 potential_constant_expression_1
../../gcc/gcc/cp/constexpr.c:5309
0x90fc07 cp_parser_constant_expression
../../gcc/gcc/cp/parser.c:9736
0x9229e2 cp_parser_direct_declarator
../../gcc/gcc/cp/parser.c:20059
0x9229e2 cp_parser_declarator
../../gcc/gcc/cp/parser.c:19798
0x9312b0 cp_parser_init_declarator
../../gcc/gcc/cp/parser.c:19323
0x9386da cp_parser_single_declaration
../../gcc/gcc/cp/parser.c:27104
0x93881c cp_parser_template_declaration_after_parameters
../../gcc/gcc/cp/parser.c:26706
0x9390dc cp_parser_explicit_template_declaration
../../gcc/gcc/cp/parser.c:26943
0x9390dc cp_parser_template_declaration_after_export
../../gcc/gcc/cp/parser.c:26962
0x93e449 cp_parser_declaration
../../gcc/gcc/cp/parser.c:12673
0x93e731 cp_parser_declaration_seq_opt
../../gcc/gcc/cp/parser.c:12600
0x93ea24 cp_parser_translation_unit
../../gcc/gcc/cp/parser.c:4559
0x93ea24 c_parse_file()
../../gcc/gcc/cp/parser.c:38820
0xa3cd46 c_common_parse_file()
../../gcc/gcc/c-family/c-opts.c:1132
Please submit a full bug report, [etc.]
