Add function.func_name

src/runtime/types.cpp

@@ -2242,6 +2242,7 @@ void setupRuntime() {
     function_cls->giveAttr("func_code", new (pyston_getset_cls) BoxedGetsetDescriptor(functionCode, NULL, NULL));
     function_cls->giveAttr("func_defaults",
                            new (pyston_getset_cls) BoxedGetsetDescriptor(functionDefaults, NULL, NULL));
+    function_cls->giveAttr("func_name", function_cls->getattr("__name__"));
     function_cls->freeze();
 
     builtin_function_or_method_cls->giveAttr(

test/tests/functions.py

@@ -12,4 +12,10 @@ def g():
 print type(f).__call__(f)
 print type(f).__call__(g)
 
+print f.__name__, f.func_name
+f.__name__ = "New name"
+print f.__name__, f.func_name
+f.func_name = "f"
+print f.__name__, f.func_name
+
 print bool(f)