ref: 65f6675040a4c29da1bd387e7dc22c823a69da97
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
	dst = slgrow(dst, len + src.len)
	slcp(dst[len:], src)
	-> dst 
}