I've heard of similar ones allowing the shooting of any Welshman within bowshot of the walls of either Chester or Shrewsbury after sunset. I think it's not clear that there were ever actual laws to this effect; if there were, they have almost certainly been repealed at some point as conflicting with the law on murder.
Tom: your general point is right, though - there are various old laws still nominally in force but having no effect. The two Statute of Marlborough chapters are part of a package of over a hundred acts or parts of acts proposed for repeal, most of them being relatively recent.