Change error message raised when free variable is not yet bound. It

now raises NameError instead of UnboundLocalError, because the var in
question is definitely not local.  (This affects test_scope.py)

Also update the recent fix by Ping using get_func_name().  Replace
tests of get_func_name() return value with call to get_func_desc() to
match all the other uses.

Lib/test/test_scope.py

@@ -291,7 +291,7 @@ else:
 
 try:
     errorInInner()
-except UnboundLocalError:
+except NameError:
     pass
 else:
     raise TestFailed
@@ -435,3 +435,4 @@ d = f(2)(4)
 verify(d.has_key('h'))
 del d['h']
 verify(d == {'x': 2, 'y': 7, 'w': 6})
+

Python/ceval.c

@@ -83,6 +83,9 @@ static void format_exc_check_arg(PyObject *, char *, PyObject *);
 	"global name '%.200s' is not defined"
 #define UNBOUNDLOCAL_ERROR_MSG \
 	"local variable '%.200s' referenced before assignment"
+#define UNBOUNDFREE_ERROR_MSG \
+	"free variable '%.200s' referenced before assignment" \
+        " in enclosing scope"
 
 /* Dynamic execution profile */
 #ifdef DYNAMIC_EXECUTION_PROFILE
@@ -1693,18 +1696,22 @@ eval_code2(PyCodeObject *co, PyObject *globals, PyObject *locals,
 			x = freevars[oparg];
 			w = PyCell_Get(x);
 			if (w == NULL) {
-				if (oparg < f->f_ncells)
+				if (oparg < f->f_ncells) {
 					v = PyTuple_GetItem(co->co_cellvars,
 							       oparg);
-				else
-				       v = PyTuple_GetItem(
-						      co->co_freevars,
-						      oparg - f->f_ncells);
-
 				       format_exc_check_arg(
 					       PyExc_UnboundLocalError,
 					       UNBOUNDLOCAL_ERROR_MSG,
 					       v);
+				} else {
+				       v = PyTuple_GetItem(
+						      co->co_freevars,
+						      oparg - f->f_ncells);
+				       format_exc_check_arg(
+					       PyExc_NameError,
+					       UNBOUNDFREE_ERROR_MSG,
+					       v);
+				}
 				err = -1;
 				break;
 			}
@@ -2883,11 +2890,10 @@ call_method(PyObject *func, PyObject *arg, PyObject *kw)
 				return NULL;
 		}
 		if (!ok) {
-			char* fn = get_func_name(func);
 			PyErr_Format(PyExc_TypeError,
 				     "unbound method %s%s must be "
 				     "called with instance as first argument",
-				     fn ? fn : "", fn ? "() " : "");
+				     get_func_name(func), get_func_desc(func));
 			return NULL;
 		}
 		Py_INCREF(arg);