Allow S->T <: dynamic->T

test/dart_codegen/expect/async/future.dart

 part of dart.async;
  abstract class Future<T> {static final _Future _nullFuture = ((__x10) => DEVC$RT.cast(__x10, DEVC$RT.type((Future<dynamic> _) {
   }
 ), DEVC$RT.type((_Future<dynamic> _) {
   }
 ), "CastExact", """line 98, column 38 of dart:async/future.dart: """, __x10 is _Future<dynamic>, true))(new Future.value(null));
  factory Future(computation()) {
   _Future result = new _Future<T>();
    Timer.run(() {
     try {
@@ skipping 96 matching lines @@
         error = theError;
          stackTrace = DEVC$RT.cast(theStackTrace, dynamic, StackTrace, "CastGeneral", """line 283, column 24 of dart:async/future.dart: """, theStackTrace is StackTrace, true);
         }
       }
      else if (remaining == 0 && !eagerError) {
       result._completeError(error, stackTrace);
       }
     }
    for (Future future in futures) {
     int pos = remaining++;
-     future.then(((__x16) => DEVC$RT.wrap((dynamic f(Object __u11)) {
-      dynamic c(Object x0) => f(x0);
-       return f == null ? null : c;
-      }
-    , __x16, __t14, __t12, "WrapLiteral", """line 294, column 19 of dart:async/future.dart: """, __x16 is __t12))((Object value) {
+     future.then((Object value) {
       remaining--;
        if (values != null) {
         values[pos] = value;
          if (remaining == 0) {
           result._completeWithValue(values);
           }
         }
        else {
         if (cleanUp != null && value != null) {
           new Future.sync(() {
             cleanUp(value);
             }
           );
           }
          if (remaining == 0 && !eagerError) {
           result._completeError(error, stackTrace);
           }
         }
       }
-    ), onError: handleError);
+    , onError: handleError);
     }
    if (remaining == 0) {
-    return ((__x17) => DEVC$RT.cast(__x17, DEVC$RT.type((Future<dynamic> _) {
+    return ((__x11) => DEVC$RT.cast(__x11, DEVC$RT.type((Future<dynamic> _) {
       }
     ), DEVC$RT.type((Future<List<dynamic>> _) {
       }
-    ), "CastExact", """line 313, column 14 of dart:async/future.dart: """, __x17 is Future<List<dynamic>>, false))(new Future.value(const []));
+    ), "CastExact", """line 313, column 14 of dart:async/future.dart: """, __x11 is Future<List<dynamic>>, false))(new Future.value(const []));
     }
    values = new List(remaining);
    return result;
   }
  static Future forEach(Iterable input, f(element)) {
   Iterator iterator = input.iterator;
    return doWhile(() {
     if (!iterator.moveNext()) return false;
      return new Future.sync(() => f(iterator.current)).then((_) => true);
     }
   );
   }
  static Future doWhile(f()) {
   _Future doneSignal = new _Future();
    var nextIteration;
-   nextIteration = Zone.current.bindUnaryCallback(((__x21) => DEVC$RT.wrap((dynamic f(bool __u18)) {
-    dynamic c(bool x0) => f(DEVC$RT.cast(x0, dynamic, bool, "CastParam", """line 359, column 52 of dart:async/future.dart: """, x0 is bool, true));
-     return f == null ? null : c;
-    }
-  , __x21, __t19, __t12, "WrapLiteral", """line 359, column 52 of dart:async/future.dart: """, __x21 is __t12))((bool keepGoing) {
+   nextIteration = Zone.current.bindUnaryCallback((bool keepGoing) {
     if (keepGoing) {
       new Future.sync(f).then(DEVC$RT.cast(nextIteration, dynamic, __t12, "CastGeneral", """line 361, column 33 of dart:async/future.dart: """, nextIteration is __t12, false), onError: doneSignal._completeError);
       }
      else {
       doneSignal._complete(null);
       }
     }
-  ), runGuarded: true);
+  , runGuarded: true);
    nextIteration(true);
    return doneSignal;
   }
  Future then(onValue(T value), {
   Function onError}
 );
  Future catchError(Function onError, {
   bool test(Object error)}
 );
  Future<T> whenComplete(action());
@@ skipping 22 matching lines @@
  void _completeWithErrorCallback(_Future result, error, stackTrace) {
 AsyncError replacement = Zone.current.errorCallback(error, DEVC$RT.cast(stackTrace, dynamic, StackTrace, "CastGeneral", """line 719, column 62 of dart:async/future.dart: """, stackTrace is StackTrace, true));
  if (replacement != null) {
 error = _nonNullError(replacement.error);
  stackTrace = replacement.stackTrace;
 }
  result._completeError(error, DEVC$RT.cast(stackTrace, dynamic, StackTrace, "CastGeneral", """line 724, column 32 of dart:async/future.dart: """, stackTrace is StackTrace, true));
 }
  Object _nonNullError(Object error) => (error != null) ? error : new NullThrownError();
  typedef dynamic __t12(dynamic __u13);
- typedef dynamic __t14(Object __u15);
- typedef dynamic __t19(bool __u20);