/in/foo.cc: In function 'int main()':
/in/foo.cc:38:10: warning: unused variable 'k' [-Wunused-variable]
   double k,b;
          ^
/in/foo.cc:38:12: warning: unused variable 'b' [-Wunused-variable]
   double k,b;
            ^

FormatError('config file not found',)