modernc.org/cc@v1.0.1/testdata/gcc-6.3.0/gcc/testsuite/gcc.c-torture/execute/921218-1.c (about)

     1  f()
     2  {
     3    return (unsigned char)("\377"[0]);
     4  }
     5  
     6  main()
     7  {
     8    if (f() != (unsigned char)(0377))
     9      abort();
    10    exit (0);
    11  }