fix #26404, incorrect cast on async function return

pkg/analyzer/test/src/task/strong/checker_test.dart

Index: pkg/analyzer/test/src/task/strong/checker_test.dart
diff --git a/pkg/analyzer/test/src/task/strong/checker_test.dart b/pkg/analyzer/test/src/task/strong/checker_test.dart
index 915f308e3dc0b8b6dd97f9b14627685084bb2979..739b24d0760175f9f8ec18c3fd8f0218992ee423 100644
--- a/pkg/analyzer/test/src/task/strong/checker_test.dart
+++ b/pkg/analyzer/test/src/task/strong/checker_test.dart
@@ -690,14 +690,14 @@ dynamic x;
 
 foo1() async => x;
 Future foo2() async => x;
-Future<int> foo3() async => /*info:DYNAMIC_CAST*/x;
+Future<int> foo3() async => x;
 Future<int> foo4() async => new Future<int>.value(/*info:DYNAMIC_CAST*/x);
 Future<int> foo5() async =>
     /*error:RETURN_OF_INVALID_TYPE*/new Future<String>.value(/*info:DYNAMIC_CAST*/x);
 
 bar1() async { return x; }
 Future bar2() async { return x; }
-Future<int> bar3() async { return /*info:DYNAMIC_CAST*/x; }
+Future<int> bar3() async { return x; }
 Future<int> bar4() async { return new Future<int>.value(/*info:DYNAMIC_CAST*/x); }
 Future<int> bar5() async {
   return /*error:RETURN_OF_INVALID_TYPE*/new Future<String>.value(/*info:DYNAMIC_CAST*/x);
@@ -713,7 +713,7 @@ baz() async {
   String d = /*error:INVALID_ASSIGNMENT*/await z;
 }
 
-Future<bool> get issue_264 async {
+Future<bool> get issue_ddc_264 async {
   await 42;
   if (new Random().nextBool()) {
     return true;
@@ -721,6 +721,11 @@ Future<bool> get issue_264 async {
     return new Future<bool>.value(false);
   }
 }
+
+
+Future<String> issue_sdk_26404() async {
+  return (1 > 0) ? new Future<String>.value('hello') : "world";
+}
 ''');
   }