The `in` keyword

Property definitions

	# The `in` keyword
	var n_kwin: TKwin is writable, noinit

src/parser/parser_nodes.nit:3007,2--3008,38

	redef fun n_kwin=(node)
	do
		_n_kwin = node
		node.parent = self
	end

src/parser/parser_prod.nit:8500,2--8504,4