foo.cc: In function 'int main()':
foo.cc:7:12: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
            for(x1=2; x1<x; x1++)
            ^~~
foo.cc:9:16: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
                if(x1!=x) break;
                ^~