From 1d2418355016d0c4ce2e3a3c58516062ea14785d Mon Sep 17 00:00:00 2001
From: Yury Selivanov <yselivanov@sprymix.com>
Date: Sun, 2 Feb 2014 12:51:20 -0500
Subject: inspect.signature: Use 'inspect.isbuiltin' in
 'Signature.from_builtin'

---
 Lib/inspect.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Lib/inspect.py b/Lib/inspect.py
index a65aafd..4e33a22 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -1594,8 +1594,9 @@ def _signature_bound_method(sig):
 def _signature_is_builtin(obj):
     # Internal helper to test if `obj` is a callable that might
     # support Argument Clinic's __text_signature__ protocol.
-    return (isinstance(obj, _NonUserDefinedCallables) or
+    return (isbuiltin(obj) or
             ismethoddescriptor(obj) or
+            isinstance(obj, _NonUserDefinedCallables) or
             # Can't test 'isinstance(type)' here, as it would
             # also be True for regular python classes
             obj in (type, object))
-- 
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