Don't delay values and errors from async/await functions.

runtime/vm/parser.cc

 // Copyright (c) 2012, 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.
 
 #include "vm/parser.h"
 
 #include "lib/invocation_mirror.h"
 #include "platform/utils.h"
 #include "vm/ast_transformer.h"
 #include "vm/bootstrap.h"
@@ skipping 7003 matching lines @@
   const Class& future =
       Class::ZoneHandle(Z, I->object_store()->future_class());
   ASSERT(!future.IsNull());
   const Function& constructor = Function::ZoneHandle(Z,
       future.LookupFunction(Symbols::FutureMicrotask()));
   ASSERT(!constructor.IsNull());
   const Class& completer =
       Class::ZoneHandle(Z, I->object_store()->completer_class());
   ASSERT(!completer.IsNull());
   const Function& completer_constructor = Function::ZoneHandle(Z,
-      completer.LookupFunction(Symbols::CompleterConstructor()));
+      completer.LookupFunction(Symbols::CompleterSyncConstructor()));
   ASSERT(!completer_constructor.IsNull());
 
   LocalVariable* async_completer = current_block_->scope->LookupVariable(
       Symbols::AsyncCompleter(), false);
 
   // Add to AST:
-  //   :async_completer = new Completer();
+  //   :async_completer = new Completer.sync();
   ArgumentListNode* empty_args =
       new (Z) ArgumentListNode(Scanner::kNoSourcePos);
   ConstructorCallNode* completer_constructor_node = new (Z) ConstructorCallNode(
       Scanner::kNoSourcePos,
       TypeArguments::ZoneHandle(Z),
       completer_constructor,
       empty_args);
   StoreLocalNode* store_completer = new (Z) StoreLocalNode(
       Scanner::kNoSourcePos,
       async_completer,
@@ skipping 7022 matching lines @@
 void Parser::SkipQualIdent() {
   ASSERT(IsIdentifier());
   ConsumeToken();
   if (CurrentToken() == Token::kPERIOD) {
     ConsumeToken();  // Consume the kPERIOD token.
     ExpectIdentifier("identifier expected after '.'");
   }
 }
 
 }  // namespace dart