ref: d5b8eb377b49496a6b000104cfa415f90f1a9548
dir: /libstd/sljoin.myr/
use "alloc.use"
use "slcp.use"
pkg std =
generic sljoin : (dst : @a[:], src : @a[:] -> @a[:])
;;
generic sljoin = {dst, src
var len
len = dst.len
dst = slgrow(dst, len + src.len)
slcp(dst[len:], src)
-> dst
}