ref: 0d7d70e5b1a4b5c7ae618d6d04fb30848b18c08f
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#
}