take into account keyword arguments when passing too many args

Lib/test/test_extcall.py

@@ -279,6 +279,15 @@ A obscure message:
     Traceback (most recent call last):
       ...
     TypeError: f() takes exactly 2 arguments (1 given)
+
+The number of arguments passed in includes keywords:
+
+    >>> def f(a):
+    ...    pass
+    >>> f(6, a=4, *(1, 2, 3))
+    Traceback (most recent call last):
+      ...
+    TypeError: f() takes exactly 1 argument (5 given)
 """
 
 import unittest

Python/ceval.c

@@ -3060,7 +3060,7 @@ PyEval_EvalCodeEx(PyCodeObject *co, PyObject *globals, PyObject *locals,
 				    defcount ? "at most" : "exactly",
 				    co->co_argcount,
 				    co->co_argcount == 1 ? "" : "s",
-				    argcount);
+				    argcount + kwcount);
 				goto fail;
 			}
 			n = co->co_argcount;