ref: 9014efa1621b6530c070ff55b26c7195910fe4ae
dir: /lib/std/sljoin.myr/
use "alloc"
use "slcp"
pkg std =
generic sljoin : (dst : @a[:]#, src : @a[:] -> @a[:])
;;
generic sljoin = {dst, src
var len
len = dst#.len
slgrow(dst, len + src.len)
slcp(dst#[len:], src)
-> dst#
}