foo.cc: In function 'int main()':
foo.cc:20:26: warning: 'f' may be used uninitialized in this function [-Wmaybe-uninitialized]
   20 |                         f++;
      |                         ~^~
foo.cc:18:26: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
   18 |                         s++;
      |                         ~^~
foo.cc:16:26: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   16 |                         x++;
      |                         ~^~
foo.cc:14:26: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
   14 |                         d++;
      |                         ~^~

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