[DSMan195276]

My evidence is that the entire page is basically just to shows CIL's output on various pieces of code, and CIL's output is linked on the page and looks like this:

    /* Generated by CIL v. 1.3.7 */
    /* print_CIL_Input is true */

    #line 1 "cilcode.tmp/ex30.c"
    int main(void) 
    { int x ;

      {
    #line 2
      return (x == (x != 0));
    }
    }

From that I think it's safe to say that it's talking about 'x' being an uninitialized variable in a function (Because that's what they put into CIL). This code definitely has the issue from UB that I described above.