Calling a generator function returns a generator object

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index fc4aba2b9f25d76feeaea2480d180c44bbf86623..dcfe4449059d15fd16afa7c07782ad2b822d23c3 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -474,7 +474,6 @@ class Parser {
    public:
     FunctionState(Parser* parser,
                   Scope* scope,
-                  bool is_generator,
                   Isolate* isolate);
     ~FunctionState();
 
@@ -505,7 +504,17 @@ class Parser {
     void AddProperty() { expected_property_count_++; }
     int expected_property_count() { return expected_property_count_; }
 
-    bool is_generator() const { return is_generator_; }
+    void set_generator_iterator_variable(Variable *variable) {
+      ASSERT(variable != NULL);
+      ASSERT(!is_generator());
+      generator_iterator_variable_ = variable;
+    }
+    Variable* generator_iterator_variable() const {
+      return generator_iterator_variable_;
+    }
+    bool is_generator() const {
+      return generator_iterator_variable_ != NULL;
+    }
 
     AstNodeFactory<AstConstructionVisitor>* factory() { return &factory_; }
 
@@ -521,9 +530,6 @@ class Parser {
     // Properties count estimation.
     int expected_property_count_;
 
-    // Indicates that this function is a generator.
-    bool is_generator_;
-
     // Keeps track of assignments to properties of this. Used for
     // optimizing constructors.
     bool only_simple_this_property_assignments_;
@@ -532,6 +538,7 @@ class Parser {
     Parser* parser_;
     FunctionState* outer_function_state_;
     Scope* outer_scope_;
+    Variable* generator_iterator_variable_;
     int saved_ast_node_id_;
     AstNodeFactory<AstConstructionVisitor> factory_;
   };