ref: 4469bf2ece473f5e51cd549131f76f184705f75f dir: /libstd/slfill.myr/
pkg std = generic slfill : (sl : @a[:], v : @a -> @a[:]) ;; generic slfill = {sl, v var i for i = 0; i < sl.len; i++ sl[i] = v ;; -> sl }