init init_aisaexpr (
		n_expr: nullable AExpr,
		n_kwisa: nullable TKwisa,
		n_type: nullable AType
	)
	do
		_n_expr = n_expr.as(not null)
		n_expr.parent = self
		_n_kwisa = n_kwisa.as(not null)
		n_kwisa.parent = self
		_n_type = n_type.as(not null)
		n_type.parent = self
	end