From df53392f0d7977e0439fb43684af5a805d5e4a45 Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Sat, 8 Oct 2016 22:01:18 +0300
Subject: [PATCH] Issue #28376: Creating instances of range_iterator by calling
 range_iterator type now is disallowed.  Calling iter() on range instance is
 the only way. Patch by Oren Milman.

---
 Lib/test/test_range.py | 37 ++++++-------------------------------
 Misc/NEWS              |  4 +---
 Objects/rangeobject.c  | 41 -----------------------------------------
 3 files changed, 7 insertions(+), 75 deletions(-)

diff --git a/Lib/test/test_range.py b/Lib/test/test_range.py
index 9e11e518f61..3675f250af8 100644
--- a/Lib/test/test_range.py
+++ b/Lib/test/test_range.py
@@ -4,7 +4,6 @@ import unittest
 import sys
 import pickle
 import itertools
-import test.support
 
 # pure Python implementations (3 args only), for comparison
 def pyrange(start, stop, step):
@@ -494,37 +493,13 @@ class RangeTest(unittest.TestCase):
             test_id = "reversed(range({}, {}, {}))".format(start, end, step)
             self.assert_iterators_equal(iter1, iter2, test_id, limit=100)
 
-    @test.support.cpython_only
-    def test_range_iterator_invocation(self):
-        import _testcapi
+    def test_range_iterators_invocation(self):
+        # verify range iterators instances cannot be created by
+        # calling their type
         rangeiter_type = type(iter(range(0)))
-
-        self.assertWarns(DeprecationWarning, rangeiter_type, 1, 3, 1)
-
-        with test.support.check_warnings(('', DeprecationWarning)):
-            # rangeiter_new doesn't take keyword arguments
-            with self.assertRaises(TypeError):
-                rangeiter_type(a=1)
-
-            # rangeiter_new takes exactly 3 arguments
-            self.assertRaises(TypeError, rangeiter_type)
-            self.assertRaises(TypeError, rangeiter_type, 1)
-            self.assertRaises(TypeError, rangeiter_type, 1, 1)
-            self.assertRaises(TypeError, rangeiter_type, 1, 1, 1, 1)
-
-            # start, stop and stop must fit in C long
-            for good_val in [_testcapi.LONG_MAX, _testcapi.LONG_MIN]:
-                rangeiter_type(good_val, good_val, good_val)
-            for bad_val in [_testcapi.LONG_MAX + 1, _testcapi.LONG_MIN - 1]:
-                self.assertRaises(OverflowError,
-                                  rangeiter_type, bad_val, 1, 1)
-                self.assertRaises(OverflowError,
-                                  rangeiter_type, 1, bad_val, 1)
-                self.assertRaises(OverflowError,
-                                  rangeiter_type, 1, 1, bad_val)
-
-            # step mustn't be zero
-            self.assertRaises(ValueError, rangeiter_type, 1, 1, 0)
+        self.assertRaises(TypeError, rangeiter_type, 1, 3, 1)
+        long_rangeiter_type = type(iter(range(1 << 1000)))
+        self.assertRaises(TypeError, long_rangeiter_type, 1, 3, 1)
 
     def test_slice(self):
         def check(start, stop, step=None):
diff --git a/Misc/NEWS b/Misc/NEWS
index 796e8092706..2afaf83aedd 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -11,9 +11,7 @@ Core and Builtins
 -----------------
 
 - Issue #28376: Creating instances of range_iterator by calling range_iterator
-  type now is deprecated.  Patch by Oren Milman.
-
-- Issue #28376: The constructor of range_iterator now checks that step is not 0.
+  type now is disallowed.  Calling iter() on range instance is the only way.
   Patch by Oren Milman.
 
 - Issue #26906: Resolving special methods of uninitialized type now causes
diff --git a/Objects/rangeobject.c b/Objects/rangeobject.c
index 8449fc7a24d..45c557ff57b 100644
--- a/Objects/rangeobject.c
+++ b/Objects/rangeobject.c
@@ -829,8 +829,6 @@ static PyMethodDef rangeiter_methods[] = {
     {NULL,              NULL}           /* sentinel */
 };
 
-static PyObject *rangeiter_new(PyTypeObject *, PyObject *args, PyObject *kw);
-
 PyTypeObject PyRangeIter_Type = {
         PyVarObject_HEAD_INIT(&PyType_Type, 0)
         "range_iterator",                        /* tp_name */
@@ -862,15 +860,6 @@ PyTypeObject PyRangeIter_Type = {
         (iternextfunc)rangeiter_next,           /* tp_iternext */
         rangeiter_methods,                      /* tp_methods */
         0,                                      /* tp_members */
-        0,                                      /* tp_getset */
-        0,                                      /* tp_base */
-        0,                                      /* tp_dict */
-        0,                                      /* tp_descr_get */
-        0,                                      /* tp_descr_set */
-        0,                                      /* tp_dictoffset */
-        0,                                      /* tp_init */
-        0,                                      /* tp_alloc */
-        rangeiter_new,                          /* tp_new */
 };
 
 /* Return number of items in range (lo, hi, step).  step != 0
@@ -925,36 +914,6 @@ fast_range_iter(long start, long stop, long step)
     return (PyObject *)it;
 }
 
-static PyObject *
-rangeiter_new(PyTypeObject *type, PyObject *args, PyObject *kw)
-{
-    long start, stop, step;
-
-    if (PyErr_WarnEx(PyExc_DeprecationWarning,
-                     "range_iterator(): creating instances of range_iterator "
-                     "by calling range_iterator type is deprecated",
-                     1)) {
-        return NULL;
-    }
-
-    if (!_PyArg_NoKeywords("range_iterator()", kw)) {
-        return NULL;
-    }
-
-    if (!PyArg_ParseTuple(args,
-                          "lll;range_iterator() requires 3 int arguments",
-                          &start, &stop, &step)) {
-        return NULL;
-    }
-    if (step == 0) {
-        PyErr_SetString(PyExc_ValueError,
-                        "range_iterator() arg 3 must not be zero");
-        return NULL;
-    }
-
-    return fast_range_iter(start, stop, step);
-}
-
 typedef struct {
     PyObject_HEAD
     PyObject *index;