init init_avarargexpr (
		n_expr: nullable AExpr,
		n_dotdotdot: nullable TDotdotdot
	)
	do
		_n_expr = n_expr.as(not null)
		n_expr.parent = self
		_n_dotdotdot = n_dotdotdot.as(not null)
		n_dotdotdot.parent = self
	end