/in/foo.cc:12:1: error: 'define' does not name a type
 define For(i,a,b) for(int i=a,i<=b;i++)
 ^~~~~~
/in/foo.cc:12:36: error: 'i' does not name a type
 define For(i,a,b) for(int i=a,i<=b;i++)
                                    ^