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   1  <?php
   2  
   3  namespace React\Promise;
   4  
   5  interface CancellablePromiseInterface extends PromiseInterface
   6  {
   7      /**
   8       * The `cancel()` method notifies the creator of the promise that there is no
   9       * further interest in the results of the operation.
  10       *
  11       * Once a promise is settled (either fulfilled or rejected), calling `cancel()` on
  12       * a promise has no effect.
  13       *
  14       * @return void
  15       */
  16      public function cancel();
  17  }