[Bug c++/88187] New: ICE on (invalid) C++ code when compiled with -std=c++17: Segmentation fault

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88187

            Bug ID: 88187
           Summary: ICE on (invalid) C++ code when compiled with
                    -std=c++17: Segmentation fault
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu
  Target Milestone: ---

This appears to be a recent regression.

$ g++tk -v
Using built-in specs.
COLLECT_GCC=g++tk
COLLECT_LTO_WRAPPER=/home/su/software/tmp/gcc/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/home/su/software/tmp/gcc/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 9.0.0 20181124 (experimental) [trunk revision 266429] (GCC) 
$ 
$ g++tk -std=c++11 tmp.cpp
tmp.cpp:3:9: error: variable or field ‘f’ declared void
    3 | void f (A ());
      |         ^
tmp.cpp:3:11: error: missing template arguments before ‘(’ token
    3 | void f (A ());
      |           ^
$ 
$ g++tk -std=c++17 tmp.cpp
tmp.cpp:3:12: internal compiler error: Segmentation fault
    3 | void f (A ());
      |            ^
0xfd219f crash_signal
        ../../gcc-source-trunk/gcc/toplev.c:326
0x9354a2 dguide_name_p(tree_node*)
        ../../gcc-source-trunk/gcc/cp/pt.c:26623
0x856d3d grokdeclarator(cp_declarator const*, cp_decl_specifier_seq*,
decl_context, int, tree_node**)
        ../../gcc-source-trunk/gcc/cp/decl.c:11281
0x917e0b cp_parser_parameter_declaration_list
        ../../gcc-source-trunk/gcc/cp/parser.c:21813
0x91850f cp_parser_parameter_declaration_clause
        ../../gcc-source-trunk/gcc/cp/parser.c:21728
0x90761d cp_parser_direct_declarator
        ../../gcc-source-trunk/gcc/cp/parser.c:20494
0x90761d cp_parser_declarator
        ../../gcc-source-trunk/gcc/cp/parser.c:20368
0x919911 cp_parser_init_declarator
        ../../gcc-source-trunk/gcc/cp/parser.c:19885
0x91a9c6 cp_parser_simple_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:13398
0x923b90 cp_parser_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:13087
0x922b05 cp_parser_translation_unit
        ../../gcc-source-trunk/gcc/cp/parser.c:4674
0x922b05 c_parse_file()
        ../../gcc-source-trunk/gcc/cp/parser.c:40680
0xa7e34a c_common_parse_file()
        ../../gcc-source-trunk/gcc/c-family/c-opts.c:1151
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$ 


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template < int > struct A;

void f (A ());