Allow S->T <: dynamic->T

test/codegen/expect/dart/isolate.js

 var isolate;
 (function(exports) {
   'use strict';
   class Capability extends core.Object {
     Capability() {
       return new _isolate_helper.CapabilityImpl();
     }
   }
   class IsolateSpawnException extends core.Object {
     IsolateSpawnException(message) {
@@ skipping 11 matching lines @@
       this.controlPort = controlPort;
       this.pauseCapability = pauseCapability;
       this.terminateCapability = terminateCapability;
     }
     static get current() {
       return dart.as(_currentIsolateCache, Isolate);
     }
     static spawn(entryPoint, message, opt$) {
       let paused = opt$.paused === void 0 ? false : opt$.paused;
       try {
-        return dart.as(_isolate_helper.IsolateNatives.spawnFunction(entryPoint, message, paused).then((msg) => new Isolate(dart.as(dart.dindex(msg, 1), SendPort), {pauseCapability: dart.as(dart.dindex(msg, 2), Capability), terminateCapability: dart.as(dart.dindex(msg, 3), Capability)})), async.Future$(Isolate));
+        return dart.as(_isolate_helper.IsolateNatives.spawnFunction(entryPoint, message, paused).then(dart.closureWrap((msg) => new Isolate(dart.as(dart.dindex(msg, 1), SendPort), {pauseCapability: dart.as(dart.dindex(msg, 2), Capability), terminateCapability: dart.as(dart.dindex(msg, 3), Capability)}), "(List<dynamic>) → dynamic")), async.Future$(Isolate));
       } catch (e) {
         let st = dart.stackTrace(e);
         return new async.Future.error(e, st);
       }
 
     }
     static spawnUri(uri, args, message, opt$) {
       let paused = opt$.paused === void 0 ? false : opt$.paused;
       let packageRoot = opt$.packageRoot === void 0 ? null : opt$.packageRoot;
       if (packageRoot !== null)
         throw new core.UnimplementedError("packageRoot");
       try {
         if (dart.is(args, core.List$(core.String))) {
           for (let i = 0; dart.notNull(i) < dart.notNull(args.length); i = dart.notNull(i) + 1) {
             if (!(typeof args.get(i) == string)) {
               throw new core.ArgumentError(`Args must be a list of Strings ${args}`);
             }
           }
         } else if (args !== null) {
           throw new core.ArgumentError(`Args must be a list of Strings ${args}`);
         }
-        return dart.as(_isolate_helper.IsolateNatives.spawnUri(uri, args, message, paused).then((msg) => new Isolate(dart.as(dart.dindex(msg, 1), SendPort), {pauseCapability: dart.as(dart.dindex(msg, 2), Capability), terminateCapability: dart.as(dart.dindex(msg, 3), Capability)})), async.Future$(Isolate));
+        return dart.as(_isolate_helper.IsolateNatives.spawnUri(uri, args, message, paused).then(dart.closureWrap((msg) => new Isolate(dart.as(dart.dindex(msg, 1), SendPort), {pauseCapability: dart.as(dart.dindex(msg, 2), Capability), terminateCapability: dart.as(dart.dindex(msg, 3), Capability)}), "(List<dynamic>) → dynamic")), async.Future$(Isolate));
       } catch (e) {
         let st = dart.stackTrace(e);
         return new async.Future.error(e, st);
       }
 
     }
     pause(resumeCapability) {
       if (resumeCapability === void 0)
         resumeCapability = null;
       if (resumeCapability === null)
@@ skipping 137 matching lines @@
   }
   // Exports:
   exports.Capability = Capability;
   exports.IsolateSpawnException = IsolateSpawnException;
   exports.Isolate = Isolate;
   exports.SendPort = SendPort;
   exports.ReceivePort = ReceivePort;
   exports.RawReceivePort = RawReceivePort;
   exports.RemoteError = RemoteError;
 })(isolate || (isolate = {}));