ref: d7d95f9f1db8434f40d5ac3c81ba486223e3893b dir: /lib/std/slfill.myr/
pkg std = generic slfill : (sl : @a[:], v : @a -> @a[:]) ;; generic slfill = {sl, v for var i = 0; i < sl.len; i++ sl[i] = v ;; -> sl }