/in/foo.cc:1:20: warning: extra tokens at end of #include directive
 #include <iostream>;
                    ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:14:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if (x1 < x2);
     ^~
/in/foo.cc:15:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
     {
     ^