diff -r 1e0e821d2626 Lib/test/test_ast.py
--- a/Lib/test/test_ast.py	Fri Nov 04 22:17:45 2011 +0100
+++ b/Lib/test/test_ast.py	Sun Nov 20 21:33:21 2011 +0100
@@ -486,6 +486,17 @@
         self.assertEqual(ast.literal_eval('10 + 2j'), 10 + 2j)
         self.assertEqual(ast.literal_eval('1.5 - 2j'), 1.5 - 2j)
 
+    def test_bad_integer(self):
+        # issue13436: Bad error message with invalid numeric values
+        body = [ast.ImportFrom(module='time', 
+                               names=[ast.alias(name='sleep')],
+                               level=None,
+                               lineno=None, col_offset=None)]
+        mod = ast.Module(body)
+        with self.assertRaises(ValueError) as cm:
+            compile(mod, 'test', 'exec')
+        self.assertIn("invalid integer value: None", str(cm.exception))
+
 
 def test_main():
     support.run_unittest(AST_Tests, ASTHelpers_Test)
diff -r 1e0e821d2626 Parser/asdl_c.py
--- a/Parser/asdl_c.py	Fri Nov 04 22:17:45 2011 +0100
+++ b/Parser/asdl_c.py	Sun Nov 20 21:33:21 2011 +0100
@@ -816,11 +816,7 @@
 {
     int i;
     if (!PyLong_Check(obj)) {
-        PyObject *s = PyObject_Repr(obj);
-        if (s == NULL) return 1;
-        PyErr_Format(PyExc_ValueError, "invalid integer value: %.400s",
-                     PyBytes_AS_STRING(s));
-        Py_DECREF(s);
+        PyErr_Format(PyExc_ValueError, "invalid integer value: %R", obj);
         return 1;
     }
 
diff -r 1e0e821d2626 Python/Python-ast.c
--- a/Python/Python-ast.c	Fri Nov 04 22:17:45 2011 +0100
+++ b/Python/Python-ast.c	Sun Nov 20 21:33:21 2011 +0100
@@ -622,11 +622,7 @@
 {
     int i;
     if (!PyLong_Check(obj)) {
-        PyObject *s = PyObject_Repr(obj);
-        if (s == NULL) return 1;
-        PyErr_Format(PyExc_ValueError, "invalid integer value: %.400s",
-                     PyBytes_AS_STRING(s));
-        Py_DECREF(s);
+        PyErr_Format(PyExc_ValueError, "invalid integer value: %R", obj);
         return 1;
     }