[Bug c/120901] New: missing diagnostics about jump into scope after defining of a VLA struct

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120901

            Bug ID: 120901
           Summary: missing diagnostics about jump into scope after
                    defining of a VLA struct
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Keywords: accepts-invalid, diagnostic
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

While looking into PR 120899, I noticed we don't error out for the following
code:
```
int main(int argc, char *argv[]) {
        goto lab;
        struct c {
          int a[argc];
        };
lab:    ;
        struct c a;
}
```