/in/foo.cc: In function 'int main()':
/in/foo.cc:61:17: warning: unused variable 't' [-Wunused-variable]
   61 |             int t;
      |                 ^
/in/foo.cc:66:17: warning: unused variable 'b_type' [-Wunused-variable]
   66 |             int b_type = (a_type + 1) % 3;
      |                 ^~~~~~