Is `self` a token or a pure-structural production like `AQId`?

Property definitions

	# Is `self` a token or a pure-structural production like `AQId`?
	fun is_structural: Bool do return false

src/parser/parser_nodes.nit:38,2--39,40

	redef fun is_structural do return true

src/parser/parser_nodes.nit:383,2--39

	redef fun is_structural do return true

src/parser/parser_nodes.nit:1764,2--39

	redef fun is_structural do return true

src/parser/parser_nodes.nit:1776,2--39