Fix T284, cdef list setitem

Cython/Compiler/ExprNodes.py

@@ -1856,14 +1856,13 @@ class IndexNode(ExprNode):
             index_code = self.index.py_result()
             if self.base.type is dict_type:
                 function = "PyDict_SetItem"
-            elif self.base.type is list_type:
-                function = "PyList_SetItem"
-            # don't use PyTuple_SetItem(), as we'd normally get a
-            # TypeError when changing a tuple, while PyTuple_SetItem()
-            # would allow updates
-            #
-            #elif self.base.type is tuple_type:
-            #    function = "PyTuple_SetItem"
+            # It would seem that we could specalized lists/tuples, but that
+            # shouldn't happen here. 
+            # Both PyList_SetItem PyTuple_SetItem and a Py_ssize_t as input, 
+            # not a PyObject*, and bad conversion here would give the wrong 
+            # exception. Also, tuples are supposed to be immutable, and raise 
+            # TypeErrors when trying to set their entries (PyTuple_SetItem 
+            # is for creating new tuples from). 
             else:
                 function = "PyObject_SetItem"
         code.putln(

tests/bugs.txt

@@ -14,4 +14,3 @@ large_consts_T237
 bad_c_struct_T252
 missing_baseclass_in_predecl_T262
 ifelseexpr_T267
-cdef_setitem_T284

tests/run/cdef_setitem_T284.pyx

 __doc__ = u'''
 >>> no_cdef()
 >>> with_cdef()
+>>> test_list(range(11), -2, None)
+[0, 1, 2, 3, 4, 5, 6, 7, 8, None, 10]
+>>> test_list(range(11), "invalid index", None)
+Traceback (most recent call last):
+...
+TypeError: list indices must be integers
 '''
 def no_cdef():
     lst = range(11)
@@ -15,3 +21,7 @@ def with_cdef():
     lst[ob] = -10
     cdef dict dd = {}
     dd[ob] = -10
+
+def test_list(list L, object i, object a):
+    L[i] = a
+    return L