foo.cc: In function 'int main()':
foo.cc:15:8: warning: pointer of type 'void *' used in arithmetic [-Wpointer-arith]
   15 |     a[0] = 456;
      |        ^
foo.cc:15:8: error: 'void*' is not a pointer-to-object type
foo.cc:16:42: warning: pointer of type 'void *' used in arithmetic [-Wpointer-arith]
   16 |     a[1024 * 1024 * 100 / sizeof(int) - 1] = 123;
      |                                          ^
cc1plus: warning: pointer of type 'void *' used in arithmetic [-Wpointer-arith]
foo.cc:16:42: error: 'void*' is not a pointer-to-object type

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