[Bug c/91839] missing error diagnosis for undeclared identifier

[tangyixuan at mail dot dlut.edu.cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91839

--- Comment #1 from tangyixuan <tangyixuan at mail dot dlut.edu.cn> ---
Hi, there still exists the above error defect in recent GCC: no error
suggestions about ‘l_2’. The reduced code is as follow:

static long a          //error
static int  f1(void;   //error
static int  f1(void)
{
  int l_24[0] = {0};
  return l_2[0];      //error
}

$ gcc-trunk -c s.c
s.c:1:14: error: expected ‘;’ before ‘static’
    1 | static long a          //error
      |              ^
      |              ;
    2 | static int  f1(void;      //error
      | ~~~~~~        
s.c:3:13: error: storage class specified for parameter ‘f1’
    3 | static int  f1(void)
      |             ^~
s.c:4:1: error: expected ‘;’, ‘,’ or ‘)’ before ‘{’ token
    4 | {
      | ^

$ gcc-trunk -version
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-10-20191124/configure --prefix=/usr/local/gcc-20191124
--enable-checking=release --enable-languages=c,c++ --disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.0.0 20191124 (experimental) (GCC)

Best regards