Reduce the number of captured variables in async code, by only capturing local

runtime/vm/ast_printer.cc

 // Copyright (c) 2011, 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/ast_printer.h"
 
 #include "vm/handles.h"
 #include "vm/log.h"
 #include "vm/object.h"
 #include "vm/os.h"
@@ skipping 173 matching lines @@
   ISL_Print("(%s (type \"%s\") (of \"%s\") ",
             node->PrettyName(),
             String::Handle(type.Name()).ToCString(),
             dst_name.ToCString());
   node->VisitChildren(this);
   ISL_Print(")");
 }
 
 
 void AstPrinter::VisitAwaitNode(AwaitNode* node) {
-  VisitGenericAstNode(node);
+  ISL_Print("(*****%s***** (scope \"%p\") ", node->PrettyName(), node->scope());
+  node->VisitChildren(this);
+  ISL_Print(")");
 }
 
 
 void AstPrinter::VisitAwaitMarkerNode(AwaitMarkerNode* node) {
-  VisitGenericAstNode(node);
+  ISL_Print("(%s (async_scope \"%p\" await_scope \"%p\"))",
+            node->PrettyName(),
+            node->async_scope(),
+            node->await_scope());
 }
 
 
 void AstPrinter::VisitPrimaryNode(PrimaryNode* node) {
-  ISL_Print("*****%s***** \"%s\")",
+  ISL_Print("(*****%s***** \"%s\")",
             node->PrettyName(),
             node->primary().ToCString());
 }
 
 
 void AstPrinter::VisitComparisonNode(ComparisonNode* node) {
   ISL_Print("(%s %s ", node->PrettyName(), node->TokenName());
   node->VisitChildren(this);
   ISL_Print(")");
 }
@@ skipping 348 matching lines @@
   ASSERT(node_sequence != NULL);
   AstPrinter ast_printer;
   const char* function_name =
       parsed_function.function().ToFullyQualifiedCString();
   ISL_Print("Ast for function '%s' {\n", function_name);
   node_sequence->Visit(&ast_printer);
   ISL_Print("}\n");
 }
 
 }  // namespace dart