https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89420
Bug ID: 89420
Summary: [9 Regression] ICE: unexpected expression 'int()' of
kind cast_expr
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: gs...@t-online.de
Target Milestone: ---
Changed between 20181028 and 20181104 (with any -std) :
$ cat z1.cc
template <explicit (int())>
$ g++-9-20190217 -c z1.cc
z1.cc:1:11: warning: 'explicit(bool)' only available with -std=c++2a or
-std=gnu++2a
1 | template <explicit (int())>
| ^~~~~~~~
z1.cc:1:26: internal compiler error: unexpected expression 'int()' of kind
cast_expr
1 | template <explicit (int())>
| ^
0x620880 cxx_eval_constant_expression
../../gcc/cp/constexpr.c:5001
0x622104 cxx_eval_outermost_constant_expr
../../gcc/cp/constexpr.c:5115
0x6243d0 maybe_constant_value(tree_node*, tree_node*, bool)
../../gcc/cp/constexpr.c:5347
0x74ade7 check_narrowing(tree_node*, tree_node*, int, bool)
../../gcc/cp/typeck2.c:931
0x5f95b0 convert_like_real
../../gcc/cp/call.c:7366
0x603692 build_converted_constant_expr(tree_node*, tree_node*, int)
../../gcc/cp/call.c:4215
0x6466d2 build_explicit_specifier(tree_node*, int)
../../gcc/cp/decl.c:16687
0x6ab02c cp_parser_function_specifier_opt
../../gcc/cp/parser.c:14236
0x6b6be0 cp_parser_decl_specifier_seq
../../gcc/cp/parser.c:13945
0x6ce143 cp_parser_parameter_declaration
../../gcc/cp/parser.c:22266
0x6cf003 cp_parser_template_parameter
../../gcc/cp/parser.c:15979
0x6cf003 cp_parser_template_parameter_list
../../gcc/cp/parser.c:15562
0x6d457d cp_parser_explicit_template_declaration
../../gcc/cp/parser.c:27955
0x6d457d cp_parser_template_declaration_after_export
../../gcc/cp/parser.c:27989
0x6d7119 cp_parser_declaration
../../gcc/cp/parser.c:13122
0x6d775e cp_parser_translation_unit
../../gcc/cp/parser.c:4698
0x6d775e c_parse_file()
../../gcc/cp/parser.c:41039
0x7962a0 c_common_parse_file()
../../gcc/c-family/c-opts.c:1155
