Fix returning from async functions.

runtime/vm/ast_test.cc

Index: runtime/vm/ast_test.cc
diff --git a/runtime/vm/ast_test.cc b/runtime/vm/ast_test.cc
index 83fea1b49f1791629b5211032e8c1bfc57357ad3..be0a7a0fcf1705003f97ffe2f6d9d63ceaa8c05f 100644
--- a/runtime/vm/ast_test.cc
+++ b/runtime/vm/ast_test.cc
@@ -32,7 +32,7 @@ TEST_CASE(Ast) {
   EXPECT(p->HasIndex());
   EXPECT_EQ(-1, p->index());
 
-  ReturnNode* r = new ReturnNode(Scanner::kNoSourcePos, lln);
+  ReturnNode* r = new ReturnNode(Scanner::kNoSourcePos, lln, NULL);
   EXPECT_EQ(lln, r->value());
 
   LiteralNode* l =
@@ -53,7 +53,7 @@ TEST_CASE(Ast) {
 
   SequenceNode* sequence_node = new SequenceNode(1, new LocalScope(NULL, 0, 0));
   LiteralNode* literal_node = new LiteralNode(2,  Smi::ZoneHandle(Smi::New(3)));
-  ReturnNode* return_node = new ReturnNode(3, literal_node);
+  ReturnNode* return_node = new ReturnNode(3, literal_node, NULL);
   sequence_node->Add(return_node);
   GrowableArray<AstNode*> nodes;
   sequence_node->CollectAllNodes(&nodes);