Prevent calls to ReturnValue::Set with pointer-valued types.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 72dc75d42a057086cf17b24c6503a6fbe424e29a..f4ae71d43cfc2d679b9c76b210b5861d14858a69 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -2429,6 +2429,10 @@ class ReturnValue {
   // Convenience getter for Isolate
   V8_INLINE Isolate* GetIsolate();
 
+  // Pointer setter: Uncompilable to prevent inadvertent misuse.
+  template <typename S>
+  V8_INLINE void Set(S* whatever);
+
  private:
   template<class F> friend class ReturnValue;
   template<class F> friend class FunctionCallbackInfo;
@@ -5974,6 +5978,13 @@ Isolate* ReturnValue<T>::GetIsolate() {
 }
 
 template<typename T>
+template<typename S>
+void ReturnValue<T>::Set(S* whatever) {
+  // Uncompilable to prevent inadvertent misuse.
+  TYPE_CHECK(S*, Primitive);
+}
+
+template<typename T>
 internal::Object* ReturnValue<T>::GetDefaultValue() {
   // Default value is always the pointer below value_ on the stack.
   return value_[-1];