/in/foo.cc: In function 'int main()':
/in/foo.cc:35:5: warning: 'x2' may be used uninitialized in this function [-Wmaybe-uninitialized]
     switch(x2)
     ^~~~~~
/in/foo.cc:18:4: warning: 'x1' may be used uninitialized in this function [-Wmaybe-uninitialized]
    switch(x1)
    ^~~~~~