Property definitions

nitc $ AIssetAttrExpr :: defaultinit
# A is-set check of old-style attributes. eg `isset x._a`
class AIssetAttrExpr
	super AAttrFormExpr

	# The `isset` keyword
	var n_kwisset: TKwisset is writable, noinit
end
src/parser/parser_nodes.nit:2768,1--2774,3