Use generic functions in zones.

sdk/lib/async/future.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart.async;
 
 /// A type representing values that are either `Future<T>` or `T`.
 ///
 /// This class declaration is a public stand-in for an internal
 /// future-or-value generic type. References to this class are resolved to the
@@ skipping 501 matching lines @@
    * the previous call has returned, and if it returned a `Future<bool>`, not
    * until that future has completed.
    */
   static Future doWhile(FutureOr<bool> action()) {
     _Future doneSignal = new _Future();
     var nextIteration;
     // Bind this callback explicitly so that each iteration isn't bound in the
     // context of all the previous iterations' callbacks.
     // This avoids, e.g., deeply nested stack traces from the stack trace
     // package.
-    nextIteration = Zone.current.bindUnaryCallback((bool keepGoing) {
+    nextIteration = Zone.current.bindUnaryCallbackGuarded((bool keepGoing) {
       while (keepGoing) {
         FutureOr<bool> result;
         try {
           result = action();
         } catch (error, stackTrace) {
           // Cannot use _completeWithErrorCallback because it completes
           // the future synchronously.
           _asyncCompleteWithErrorCallback(doneSignal, error, stackTrace);
           return;
         }
         if (result is Future<bool>) {
           result.then(nextIteration, onError: doneSignal._completeError);
           return;
         }
         keepGoing = result;
       }
       doneSignal._complete(null);
-    }, runGuarded: true);
+    });
     nextIteration(true);
     return doneSignal;
   }
 
   /**
    * Register callbacks to be called when this future completes.
    *
    * When this future completes with a value,
    * the [onValue] callback will be called with that value.
    * If this future is already completed, the callback will not be called
@@ skipping 358 matching lines @@
   AsyncError replacement = Zone.current.errorCallback(error, stackTrace);
   if (replacement != null) {
     error = _nonNullError(replacement.error);
     stackTrace = replacement.stackTrace;
   }
   result._asyncCompleteError(error, stackTrace);
 }
 
 /** Helper function that converts `null` to a [NullThrownError]. */
 Object _nonNullError(Object error) => error ?? new NullThrownError();