/in/foo.cc: In function 'int main()':
/in/foo.cc:6:19: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
 #define fo(i,a,b) for(int i=a;i<=b;i++)
                   ^
/in/foo.cc:24:2: note: in expansion of macro 'fo'
  fo(i,1,n) f[i]=i;t=n;
  ^~
/in/foo.cc:24:19: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
  fo(i,1,n) f[i]=i;t=n;
                   ^