/in/foo.cc:13:17: error: stray '\' in program
   13 |    result=result\i;
      |                 ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:13:17: error: expected ';' before 'i'
   13 |    result=result\i;
      |                 ^~
      |                 ;