$x: pop;
$y: 123;
div {
foo: url(bloo/blah.css);
bar: url(http://foo/bar/hux.css);
foo: url(fudge#{$x}.css);
bar: url("http://fudge#{$x}/styles.css");
hux: url(http://box_#{$y}////fudge#{$x}.css);
@each $i in (1 2 3 4 5) {
hux: url(http://box_#{$y}////fudge#{$x}.css);
foo: url(http://blah.com/bar-#{$i}.css);
}
gloo: url("hey#{1+2}.css");
floo: url(hadoop-#{$y+321}.css);
}