In the construction of any will of a person who dies, or of a deed of trust executed and becoming effective after May 1, 1958, which instrument shall create a power to appoint by will, unlimited as to the persons to whom the donee of the power may appoint, the instrument shall be deemed to permit appointment to the estate of the donee of the power unless a contrary intention shall appear by the terms thereof.
R.I. Gen. Laws § 34-22-12