modernc.org/cc@v1.0.1/testdata/gcc-6.3.0/gcc/testsuite/gcc.c-torture/execute/950605-1.c (about)

     1  f (c)
     2      unsigned char c;
     3  {
     4    if (c != 0xFF)
     5      abort ();
     6  }
     7  
     8  main ()
     9  {
    10    f (-1);
    11    exit (0);
    12  }