make SomeFuture public

Author: diegomrsantos

chronos/internal/asyncfutures.nim

@@ -60,7 +60,7 @@ type
   FutureCompletedError* = object of FutureError
     ## Error raised when trying access the error of a completed Future
 
-  SomeFuture = Future|InternalRaisesFuture
+  SomeFuture* = Future|InternalRaisesFuture
 
 func raiseFuturePendingError(fut: FutureBase) {.
     noinline, noreturn, raises: FuturePendingError.} =
@@ -1241,6 +1241,15 @@ proc one*[F: SomeFuture](futs: openArray[F]): Future[F] {.
 
   oneImpl
 
+proc oneCancel*[F: SomeFuture](futs: varargs[F]): Future[F] {.
+    async: (raw: true, raises: [ValueError, CancelledError]).} =
+  try:
+    await one(futs)
+  finally:
+    for f in futs:
+      if not f.completed:
+        await f.cancelAndWait()
+
 template raceImpl =
   # If one of the Future[T] already finished we return it as result
   for fut in futs: