pkg/dev_compiler/lib/js/common/dart_sdk.js

Index: pkg/dev_compiler/lib/js/common/dart_sdk.js
diff --git a/pkg/dev_compiler/lib/js/common/dart_sdk.js b/pkg/dev_compiler/lib/js/common/dart_sdk.js
index 0237cf334dbd513518750ccf04567b94b8db6e2c..b895ceec7a28e5e053f6bbac9a5e212fd9abf843 100644
--- a/pkg/dev_compiler/lib/js/common/dart_sdk.js
+++ b/pkg/dev_compiler/lib/js/common/dart_sdk.js
@@ -110,6 +110,7 @@ let SetOfSendPort = () => (SetOfSendPort = dart.constFn(core.Set$(isolate$.SendP
 let ListOf_IsolateEvent = () => (ListOf_IsolateEvent = dart.constFn(core.List$(_isolate_helper._IsolateEvent)))();
 let QueueOf_IsolateEvent = () => (QueueOf_IsolateEvent = dart.constFn(collection.Queue$(_isolate_helper._IsolateEvent)))();
 let CompleterOfList = () => (CompleterOfList = dart.constFn(async.Completer$(core.List)))();
+let FutureOrOfList = () => (FutureOrOfList = dart.constFn(async.FutureOr$(core.List)))();
 let dynamicTovoid = () => (dynamicTovoid = dart.constFn(dart.functionType(dart.void, [dart.dynamic])))();
 let StringTovoid = () => (StringTovoid = dart.constFn(dart.functionType(dart.void, [core.String])))();
 let ExpandoOfint = () => (ExpandoOfint = dart.constFn(core.Expando$(core.int)))();
@@ -9838,7 +9839,7 @@ _isolate_helper.IsolateNatives = class IsolateNatives extends core.Object {
     let completer = CompleterOfList().new();
     port.first.then(dart.dynamic)(dart.fn(msg => {
       if (dart.equals(dart.dindex(msg, 0), _isolate_helper._SPAWNED_SIGNAL)) {
-        completer.complete(msg);
+        completer.complete(FutureOrOfList()._check(msg));
       } else {
         dart.assert(dart.equals(dart.dindex(msg, 0), _isolate_helper._SPAWN_FAILED_SIGNAL));
         completer.completeError(dart.dindex(msg, 1));
@@ -18309,12 +18310,14 @@ async._Completer$ = dart.generic(T => {
 async._Completer = _Completer();
 const _asyncCompleteError = Symbol('_asyncCompleteError');
 async._AsyncCompleter$ = dart.generic(T => {
+  let FutureOrOfT = () => (FutureOrOfT = dart.constFn(async.FutureOr$(T)))();
   class _AsyncCompleter extends async._Completer$(T) {
     new() {
       super.new();
     }
     complete(value) {
       if (value === void 0) value = null;
+      FutureOrOfT()._check(value);
       if (!dart.test(this.future[_mayComplete])) dart.throw(new core.StateError("Future already completed"));
       this.future[_asyncComplete](value);
     }
@@ -18324,7 +18327,7 @@ async._AsyncCompleter$ = dart.generic(T => {
   }
   dart.setSignature(_AsyncCompleter, {
     methods: () => ({
-      complete: dart.definiteFunctionType(dart.void, [], [dart.dynamic]),
+      complete: dart.definiteFunctionType(dart.void, [], [FutureOrOfT()]),
       [_completeError]: dart.definiteFunctionType(dart.void, [core.Object, core.StackTrace])
     })
   });
@@ -18332,12 +18335,14 @@ async._AsyncCompleter$ = dart.generic(T => {
 });
 async._AsyncCompleter = _AsyncCompleter();
 async._SyncCompleter$ = dart.generic(T => {
+  let FutureOrOfT = () => (FutureOrOfT = dart.constFn(async.FutureOr$(T)))();
   class _SyncCompleter extends async._Completer$(T) {
     new() {
       super.new();
     }
     complete(value) {
       if (value === void 0) value = null;
+      FutureOrOfT()._check(value);
       if (!dart.test(this.future[_mayComplete])) dart.throw(new core.StateError("Future already completed"));
       this.future[_complete](value);
     }
@@ -18347,7 +18352,7 @@ async._SyncCompleter$ = dart.generic(T => {
   }
   dart.setSignature(_SyncCompleter, {
     methods: () => ({
-      complete: dart.definiteFunctionType(dart.void, [], [dart.dynamic]),
+      complete: dart.definiteFunctionType(dart.void, [], [FutureOrOfT()]),
       [_completeError]: dart.definiteFunctionType(dart.void, [core.Object, core.StackTrace])
     })
   });