Disallow explicit parameter default values in redirecting factory (issue 13662).

sdk/lib/async/zone.dart

 // Copyright (c) 2013, 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;
 
 typedef dynamic ZoneCallback();
 typedef dynamic ZoneUnaryCallback(arg);
 typedef dynamic ZoneBinaryCallback(arg1, arg2);
 
@@ skipping 46 matching lines @@
  * arguments on the way.
  *
  * *The `runAsync` handler is deprecated. Use `scheduleMicrotask` instead.*
  */
 abstract class ZoneSpecification {
   /**
    * Creates a specification with the provided handlers.
    */
   const factory ZoneSpecification({
     dynamic handleUncaughtError(Zone self, ZoneDelegate parent, Zone zone,
-                                error, StackTrace stackTrace): null,
-    dynamic run(Zone self, ZoneDelegate parent, Zone zone, f()): null,
+                                error, StackTrace stackTrace),
+    dynamic run(Zone self, ZoneDelegate parent, Zone zone, f()),
     dynamic runUnary(
-        Zone self, ZoneDelegate parent, Zone zone, f(arg), arg): null,
+        Zone self, ZoneDelegate parent, Zone zone, f(arg), arg),
     dynamic runBinary(Zone self, ZoneDelegate parent, Zone zone,
-                      f(arg1, arg2), arg1, arg2): null,
+                      f(arg1, arg2), arg1, arg2),
     ZoneCallback registerCallback(
-        Zone self, ZoneDelegate parent, Zone zone, f()): null,
+        Zone self, ZoneDelegate parent, Zone zone, f()),
     ZoneUnaryCallback registerUnaryCallback(
-        Zone self, ZoneDelegate parent, Zone zone, f(arg)): null,
+        Zone self, ZoneDelegate parent, Zone zone, f(arg)),
     ZoneBinaryCallback registerBinaryCallback(
-        Zone self, ZoneDelegate parent, Zone zone, f(arg1, arg2)): null,
+        Zone self, ZoneDelegate parent, Zone zone, f(arg1, arg2)),
     void scheduleMicrotask(
-        Zone self, ZoneDelegate parent, Zone zone, f()): null,
+        Zone self, ZoneDelegate parent, Zone zone, f()),
     void runAsync(
-        Zone self, ZoneDelegate parent, Zone zone, f()): null,
+        Zone self, ZoneDelegate parent, Zone zone, f()),
     Timer createTimer(Zone self, ZoneDelegate parent, Zone zone,
-                      Duration duration, void f()): null,
+                      Duration duration, void f()),
     Timer createPeriodicTimer(Zone self, ZoneDelegate parent, Zone zone,
-                              Duration period, void f(Timer timer)): null,
-    void print(Zone self, ZoneDelegate parent, Zone zone, String line): null,
+                              Duration period, void f(Timer timer)),
+    void print(Zone self, ZoneDelegate parent, Zone zone, String line),
     Zone fork(Zone self, ZoneDelegate parent, Zone zone,
-              ZoneSpecification specification, Map zoneValues): null
+              ZoneSpecification specification, Map zoneValues)
   }) = _ZoneSpecification;
 
   /**
    * Creates a specification from [other] with the provided handlers overriding
    * the ones in [other].
    */
   factory ZoneSpecification.from(ZoneSpecification other, {
     dynamic handleUncaughtError(Zone self, ZoneDelegate parent, Zone zone,
                                 error, StackTrace stackTrace): null,
     dynamic run(Zone self, ZoneDelegate parent, Zone zone, f()): null,
@@ skipping 913 matching lines @@
   ZoneSpecification specification =
     new ZoneSpecification(handleUncaughtError: errorHandler,
                           scheduleMicrotask: asyncHandler);
   Zone zone = Zone.current.fork(specification: specification);
   if (onError != null) {
     return zone.runGuarded(body);
   } else {
     return zone.run(body);
   }
 }