ref: dd2752bb02095b9852928da15d994940fd1af972
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 
}