The `as` keyword

Property definitions

	# The `as` keyword
	var n_kwas: TKwas is writable, noinit

src/parser/parser_nodes.nit:1565,2--1566,38

	redef fun n_kwas=(node)
	do
		_n_kwas = node
		node.parent = self
	end

src/parser/parser_prod.nit:8389,2--8393,4