The `interface` keyword.

Property definitions

	# The `interface` keyword.
	var n_kwinterface: TKwinterface is writable, noinit

src/parser/parser_nodes.nit:1318,2--1319,52

	redef fun n_kwinterface=(node)
	do
		_n_kwinterface = node
		node.parent = self
	end

src/parser/parser_prod.nit:652,2--656,4