/in/foo.cc: In function 'int main()':
/in/foo.cc:10:18: warning: array subscript -1 is outside array bounds of 'char [8388608]' [-Warray-bounds]
   10 |     Stk[0] = Buf - 1;
      |              ~~~~^~~
/in/foo.cc:2:6: note: at offset -1 into object 'Buf' of size 8388608
    2 | char Buf[1 << 23], *cBuf = Buf;
      |      ^~~