492. Frustration and repudiation.

There is no longer a principle of law that the contractual doctrine of frustration1 can never apply so as to determine a lease2. The fact that an executed lease, as well as being of a contractual nature, conveys an estate in land is no bar in principle to the application of the doctrine3. Even so, the instances in which the doctrine can apply so as to determine a lease will be rare4. There is no reported English case where a lease has been ruled to have been frustrated5. A possible instance of the application of the doctrine would be