Bubble up exceptions throw async/await.

runtime/vm/parser.h

 // 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.
 
 #ifndef VM_PARSER_H_
 #define VM_PARSER_H_
 
 #include "include/dart_api.h"
 
 #include "platform/assert.h"
@@ skipping 525 matching lines @@
   void BuildDispatcherScope(const Function& func,
                             const ArgumentsDescriptor& desc,
                             Array* default_values);
 
   void ChainNewBlock(LocalScope* outer_scope);
   void OpenBlock();
   void OpenLoopBlock();
   void OpenFunctionBlock(const Function& func);
   void OpenAsyncClosure();
   RawFunction* OpenAsyncFunction(intptr_t formal_param_pos);
+  void OpenAsyncTryBlock();
   SequenceNode* CloseBlock();
   SequenceNode* CloseAsyncFunction(const Function& closure,
                                    SequenceNode* closure_node);
-  void CloseAsyncClosure(SequenceNode* body);
+  SequenceNode* CloseAsyncClosure(SequenceNode* body);
+  SequenceNode* CloseAsyncTryBlock(SequenceNode* try_block);
   void AddAsyncClosureVariables();
 
 
   LocalVariable* LookupPhaseParameter();
   LocalVariable* LookupReceiver(LocalScope* from_scope, bool test_only);
   LocalVariable* LookupTypeArgumentsParameter(LocalScope* from_scope,
                                               bool test_only);
   void CaptureInstantiator();
   AstNode* LoadReceiver(intptr_t token_pos);
   AstNode* LoadTypeArgumentsParameter(intptr_t token_pos);
@@ skipping 252 matching lines @@
   bool unregister_pending_function_;
 
   LocalScope* async_temp_scope_;
 
   DISALLOW_COPY_AND_ASSIGN(Parser);
 };
 
 }  // namespace dart
 
 #endif  // VM_PARSER_H_