How do you create multiple box-shadow values in LESS CSS

Question

This works with newer LESS versions:

.box-shadow(2px 2px 3px rgba(0,0,0,.4), 0px 0px 5px rgba(0,0,0,.8););
                                  // this semicolon is important! ^

And this uglier version works even with older LESS versions:

.box-shadow(~"2px 2px 3px rgba(0,0,0,.4), 0px 0px 5px rgba(0,0,0,.8)");

Update:
LESS evolved, so this answer was updated and is now correct again. Thanks Michał Rybak