The `for` keyword

Property definitions

	# The `for` keyword
	var n_kwfor: TKwfor is writable, noinit

src/parser/parser_nodes.nit:2038,2--2039,40

	redef fun n_kwfor=(node)
	do
		_n_kwfor = node
		node.parent = self
	end

src/parser/parser_prod.nit:3383,2--3387,4