/in/foo.c: In function 'main':
/in/foo.c:38:5: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
    y++;
    ~^~
/in/foo.c:36:5: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
    x++;
    ~^~