Await it!

runtime/vm/ast_printer.cc

Index: runtime/vm/ast_printer.cc
diff --git a/runtime/vm/ast_printer.cc b/runtime/vm/ast_printer.cc
index e20d2c17a9fa9549df6269850c82e252294ebcea..f1f1a8bfce9b599316447a1c65105dbe35cd4243 100644
--- a/runtime/vm/ast_printer.cc
+++ b/runtime/vm/ast_printer.cc
@@ -46,6 +46,12 @@ void AstPrinter::VisitArgumentListNode(ArgumentListNode* arguments) {
 
 void AstPrinter::VisitReturnNode(ReturnNode* node) {
   VisitGenericAstNode(node);
+  OS::Print("(%s %s",
+            node->PrettyName(),
+            (node->return_type() == ReturnNode::kContinuation) ?
+                "continuation" : "");
+  node->VisitChildren(this);
+  OS::Print(")");
 }
 
 
@@ -157,6 +163,11 @@ void AstPrinter::VisitAwaitNode(AwaitNode* node) {
 }
 
 
+void AstPrinter::VisitAwaitMarkerNode(AwaitMarkerNode* node) {
+  VisitGenericAstNode(node);
+}
+
+
 void AstPrinter::VisitPrimaryNode(PrimaryNode* node) {
   OS::Print("*****%s***** \"%s\")",
             node->PrettyName(),