--- a/src/function.cpp	Sun Aug 30 15:23:26 2009 -0700
+++ b/src/function.cpp	Sun Aug 30 15:47:23 2009 -0700
@@ -144,6 +144,8 @@
    "Base line number of function's source code."},
   {"line_extent", T_UINT, offsetof(PYM_JSFunction, lineExtent), READONLY,
    "Line extent of function's source code."},
+  {"is_python", T_BYTE, offsetof(PYM_JSFunction, isPython), READONLY,
+   "Whether or not the function is implemented in Python."},
   {NULL, NULL, NULL, NULL, NULL}
 };
 
@@ -206,6 +208,7 @@
   jsFunction->filename = NULL;
   jsFunction->baseLineno = 0;
   jsFunction->lineExtent = 0;
+  jsFunction->isPython = 0;
 
   JSString *name = JS_GetFunctionId(jsFunction->fun);
   if (name != NULL) {
@@ -284,5 +287,7 @@
     return NULL;
   }
 
+  object->isPython = 1;
+
   return object;
 }

--- a/src/function.h	Sun Aug 30 15:23:26 2009 -0700
+++ b/src/function.h	Sun Aug 30 15:47:23 2009 -0700
@@ -50,6 +50,7 @@
   const char *filename;
   unsigned int baseLineno;
   unsigned int lineExtent;
+  char isPython;
 } PYM_JSFunction;
 
 extern PyTypeObject PYM_JSFunctionType;

--- a/tests/test_pymonkey.py	Sun Aug 30 15:23:26 2009 -0700
+++ b/tests/test_pymonkey.py	Sun Aug 30 15:47:23 2009 -0700
@@ -204,6 +204,20 @@
         self.assertEqual(str(pymonkey.undefined),
                          "pymonkey.undefined")
 
+    def testScriptedJsFuncHasIsPythonFalse(self):
+        cx = pymonkey.Runtime().new_context()
+        jsfunc = cx.evaluate_script(cx.new_object(), 
+                                    '(function(){})', '<string>', 1)
+        self.assertFalse(jsfunc.is_python)
+
+    def testJsWrappedPythonFuncHasIsPythonTrue(self):
+        def foo(cx, this, args):
+            pass
+
+        cx = pymonkey.Runtime().new_context()
+        jsfunc = cx.new_function(foo, foo.__name__)
+        self.assertTrue(jsfunc.is_python)
+
     def testJsWrappedPythonFuncHasNoFilename(self):
         def foo(cx, this, args):
             pass