[Bug c/91193] New: [8 regression] ICE on invalid: tree check: expected class ‘type’, have ‘declaration’ (function_decl) in grokdeclarator, at c/c-decl.c:5956

[dimhen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91193

            Bug ID: 91193
           Summary: [8 regression] ICE on invalid: tree check: expected
                    class ‘type’, have ‘declaration’ (function_decl) in
                    grokdeclarator, at c/c-decl.c:5956
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dimhen at gmail dot com
  Target Milestone: ---

r257061 FAIL
r273505 FAIL

$ cat x.i
typedef a;
void a() a b;

$ /usr/local/gcc_current/bin/gcc -fpreprocessed x.i
x.i:1:9: warning: type defaults to ‘int’ in declaration of ‘a’ [-Wimplicit-int]
    1 | typedef a;
      |         ^
x.i:2:6: error: ‘a’ redeclared as different kind of symbol
    2 | void a() a b;
      |      ^
x.i:1:9: note: previous declaration of ‘a’ was here
    1 | typedef a;
      |         ^
x.i: In function ‘a’:
x.i:2:1: internal compiler error: tree check: expected class ‘type’, have
‘declaration’ (function_decl) in grokdeclarator, at c/c-decl.c:5956
    2 | void a() a b;
      | ^~~~
0x7a948e tree_class_check_failed(tree_node const*, tree_code_class, char
const*, int, char const*)
        /home/dimhen/src/gcc_current/gcc/tree.c:9953
0x5db72d tree_class_check(tree_node*, tree_code_class, char const*, int, char
const*)
        /home/dimhen/src/gcc_current/gcc/tree.h:3340
0x5db72d grokdeclarator
        /home/dimhen/src/gcc_current/gcc/c/c-decl.c:5956
0xa39e3b start_decl(c_declarator*, c_declspecs*, bool, tree_node*)
        /home/dimhen/src/gcc_current/gcc/c/c-decl.c:4872
0xa8e114 c_parser_declaration_or_fndef
        /home/dimhen/src/gcc_current/gcc/c/c-parser.c:2159
0xa8f16a c_parser_declaration_or_fndef
        /home/dimhen/src/gcc_current/gcc/c/c-parser.c:2321
0xa963cf c_parser_external_declaration
        /home/dimhen/src/gcc_current/gcc/c/c-parser.c:1658
0xa96e19 c_parser_translation_unit
        /home/dimhen/src/gcc_current/gcc/c/c-parser.c:1539
0xa96e19 c_parse_file()
        /home/dimhen/src/gcc_current/gcc/c/c-parser.c:20010
0xaecfcb c_common_parse_file()
        /home/dimhen/src/gcc_current/gcc/c-family/c-opts.c:1160
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.

$ /usr/local/gcc_current/bin/gcc -v
Using built-in specs.
COLLECT_GCC=/usr/local/gcc_current/bin/gcc
COLLECT_LTO_WRAPPER=/usr/local/gcc_current/libexec/gcc/x86_64-pc-linux-gnu/10.0.0/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
Target: x86_64-pc-linux-gnu
Configured with: /home/dimhen/src/gcc_current/configure
--prefix=/usr/local/gcc_current --enable-checking=yes,df,fold,rtl,extra
--enable-languages=c,c++,lto --disable-multilib --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-gnu-unique-object
--enable-linker-build-id --with-linker-hash-style=gnu --enable-plugin
--enable-initfini-array --with-isl --enable-offload-targets=nvptx-none
--without-cuda-driver --enable-gnu-indirect-function --with-tune=native
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.0.0 20190716 (experimental) [trunk revision 273505] (GCC)