test case for ticket 636

tests/bugs.txt

@@ -18,6 +18,7 @@ for_from_pyvar_loop_T601
 decorators_T593
 temp_sideeffects_T654
 class_scope_T671
+slice2_T636
 
 # CPython regression tests that don't current work:
 pyregr.test_threadsignals

tests/run/slice2_T636.pyx

+# mode: run
+# ticket 636
+# tag: slicing, getitem
+
+class Sliceable(object):
+    """
+    >>> sl = Sliceable()
+
+    >>> sl[1:2]
+    (1, 2, None)
+    >>> py_slice2(sl, 1, 2)
+    (1, 2, None)
+
+    >>> sl[1:None]
+    (1, None, None)
+    >>> py_slice2(sl, 1, None)
+    (1, None, None)
+
+    >>> sl[None:2]
+    (None, 2, None)
+    >>> py_slice2(sl, None, 2)
+    (None, 2, None)
+
+    >>> sl[None:None]
+    (None, None, None)
+    >>> py_slice2(sl, None, None)
+    (None, None, None)
+    """
+    def __getitem__(self, sl):
+        return (sl.start, sl.stop, sl.step)
+
+def py_slice2(obj,a,b):
+    """
+    >>> [1,2,3][1:2]
+    [2]
+    >>> py_slice2([1,2,3], 1, 2)
+    [2]
+
+    >>> [1,2,3][None:2]
+    [1, 2]
+    >>> py_slice2([1,2,3], None, 2)
+    [1, 2]
+
+    >>> [1,2,3][None:None]
+    [1, 2, 3]
+    >>> py_slice2([1,2,3], None, None)
+    [1, 2, 3]
+    """
+    return obj[a:b]