/in/foo.cc: In function 'int main()':
/in/foo.cc:10:7: warning: statement has no effect [-Wunused-value]
   10 |     x == '1';
      |     ~~^~~~~~
/in/foo.cc:13:7: warning: statement has no effect [-Wunused-value]
   13 |     x == '0';
      |     ~~^~~~~~