foo.cc: In function ‘void b(int)’:
foo.cc:6:23: error: expected primary-expression before ‘return’
    6 |         if(x==1)cnt++,return;
      |                       ^~~~~~
foo.cc:8:23: error: expected primary-expression before ‘return’
    8 |         if(x==2)cnt++,return;
      |                       ^~~~~~
foo.cc:10:23: error: expected primary-expression before ‘return’
   10 |         if(x==3)cnt++,return;
      |                       ^~~~~~