[Bug c/71583] New: ICE on invalid code on x86_64-linux-gnu (in c_parser_postfix_expression_after_paren_type, at c/c-parser.c:8192)

[chengniansun at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71583

            Bug ID: 71583
           Summary: ICE on invalid code on x86_64-linux-gnu (in
                    c_parser_postfix_expression_after_paren_type, at
                    c/c-parser.c:8192)
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chengniansun at gmail dot com
  Target Milestone: ---

gcc-5.3 and older versions do not crash. 


$: gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 7.0.0 20160618 (experimental) [trunk revision 237575] (GCC) 
$: 
$: gcc-trunk -c small.c
small.c: In function ‘fn1’:
small.c:4:4: error: expected expression before ‘int’
   {int};
    ^~~
small.c:4:4: internal compiler error: in
c_parser_postfix_expression_after_paren_type, at c/c-parser.c:8192
0x6ac63f c_parser_postfix_expression_after_paren_type
        ../../gcc-source-trunk/gcc/c/c-parser.c:8192
0x6a4300 c_parser_cast_expression
        ../../gcc-source-trunk/gcc/c/c-parser.c:6757
0x6a4374 c_parser_binary_expression
        ../../gcc-source-trunk/gcc/c/c-parser.c:6580
0x6a5025 c_parser_conditional_expression
        ../../gcc-source-trunk/gcc/c/c-parser.c:6351
0x6a56a0 c_parser_expr_no_commas
        ../../gcc-source-trunk/gcc/c/c-parser.c:6268
0x6a5da2 c_parser_expression
        ../../gcc-source-trunk/gcc/c/c-parser.c:8463
0x6a6809 c_parser_expression_conv
        ../../gcc-source-trunk/gcc/c/c-parser.c:8496
0x6bcb08 c_parser_statement_after_labels
        ../../gcc-source-trunk/gcc/c/c-parser.c:5287
0x6be9ab c_parser_compound_statement_nostart
        ../../gcc-source-trunk/gcc/c/c-parser.c:4861
0x6bf23e c_parser_compound_statement
        ../../gcc-source-trunk/gcc/c/c-parser.c:4696
0x6c0467 c_parser_declaration_or_fndef
        ../../gcc-source-trunk/gcc/c/c-parser.c:2105
0x6c9605 c_parser_external_declaration
        ../../gcc-source-trunk/gcc/c/c-parser.c:1549
0x6c9e99 c_parser_translation_unit
        ../../gcc-source-trunk/gcc/c/c-parser.c:1430
0x6c9e99 c_parse_file()
        ../../gcc-source-trunk/gcc/c/c-parser.c:17930
0x72c292 c_common_parse_file()
        ../../gcc-source-trunk/gcc/c-family/c-opts.c:1070
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
$: 
$: gcc-5.3 small.c
small.c: In function ‘fn1’:
small.c:4:4: error: expected expression before ‘int’
   {int};
    ^
small.c:4: confused by earlier errors, bailing out
$: 
$: cat small.c
int i;
void fn1() {
  (int(*)[++i]) 
  {int};
}
$: