The `isa` keyword, if any

Property definitions

	# The `isa` keyword, if any
	var n_kwisa: nullable TKwisa = null is writable

src/parser/parser_nodes.nit:1414,2--1415,48

	redef fun n_kwisa=(node)
	do
		_n_kwisa = node
		if node != null then node.parent = self
	end

src/parser/parser_prod.nit:1280,2--1284,4