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             FuncChainTask.cs
        
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      using System;

      namespace Implab {

          public class FuncChainTask<TResult> : FuncChainTaskBase<TResult>, IDeferred {

              readonly Func<IPromise<TResult>> m_task;

              public FuncChainTask(Func<IPromise<TResult>> task, Func<Exception, IPromise<TResult>> error, Func<Exception, IPromise<TResult>> cancel, bool autoCancellable)

                  : base(error, cancel, autoCancellable) {

                  m_task = task;

              }

              public void Resolve() {

                  if (m_task != null && LockCancelation()) {

                      try {

                          var operation = m_task();

                          operation.On(SetResult, HandleErrorInternal, HandleCancelInternal);

                          CancellationRequested(operation.Cancel);

                      } catch (OperationCanceledException reason) {

                          HandleCancelInternal(reason);

                      } catch (Exception err) {

                          HandleErrorInternal(err);

                      }

                  }

              }

          }

      }

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				using System;

				namespace Implab {
				public class FuncChainTask<TResult> : FuncChainTaskBase<TResult>, IDeferred {
				readonly Func<IPromise<TResult>> m_task;

				public FuncChainTask(Func<IPromise<TResult>> task, Func<Exception, IPromise<TResult>> error, Func<Exception, IPromise<TResult>> cancel, bool autoCancellable)
				: base(error, cancel, autoCancellable) {
				m_task = task;
				}

				public void Resolve() {
				if (m_task != null && LockCancelation()) {
				try {
				var operation = m_task();
				operation.On(SetResult, HandleErrorInternal, HandleCancelInternal);
				CancellationRequested(operation.Cancel);
				} catch (OperationCanceledException reason) {
				HandleCancelInternal(reason);
				} catch (Exception err) {
				HandleErrorInternal(err);
				}
				}
				}
				}
				}