I thought asparagus from a distance, but different up close. Stems are ridged and no soft leaves. Berry has single seed (at least the one I split open) rather than 3-6.
I have added photo 4 to contrast it with Asparagus officinalis (Asparagus) (Asparagus officinalis, the one on the right). It does look like an asparagus, but not a climber and not officinalis.