1 files changed, 26 insertions, 16 deletions

diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 75afa86..356bb50 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -57,6 +57,11 @@ builtin___build_class__(PyObject *self, PyObject *args, PyObject *kwds)
         return NULL;
     }
     func = PyTuple_GET_ITEM(args, 0); /* Better be callable */
+    if (!PyFunction_Check(func)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "__build__class__: func must be a function");
+        return NULL;
+    }
     name = PyTuple_GET_ITEM(args, 1);
     if (!PyUnicode_Check(name)) {
         PyErr_SetString(PyExc_TypeError,
@@ -155,7 +160,9 @@ builtin___build_class__(PyObject *self, PyObject *args, PyObject *kwds)
         Py_DECREF(bases);
         return NULL;
     }
-    cell = PyObject_CallFunctionObjArgs(func, ns, NULL);
+    cell = PyEval_EvalCodeEx(PyFunction_GET_CODE(func), PyFunction_GET_GLOBALS(func), ns,
+                             NULL, 0, NULL, 0, NULL, 0, NULL,
+                             PyFunction_GET_CLOSURE(func));
     if (cell != NULL) {
         PyObject *margs;
         margs = PyTuple_Pack(3, name, bases, ns);
@@ -659,7 +666,7 @@ builtin_compile(PyObject *self, PyObject *args, PyObject *kwds)
         goto finally;
     }
 
-    str = source_as_string(cmd, "compile", "string, bytes, AST or code", &cf);
+    str = source_as_string(cmd, "compile", "string, bytes or AST", &cf);
     if (str == NULL)
         goto error;
 
@@ -1810,10 +1817,10 @@ For most object types, eval(repr(object)) == object.");
 static PyObject *
 builtin_round(PyObject *self, PyObject *args, PyObject *kwds)
 {
-    static PyObject *round_str = NULL;
     PyObject *ndigits = NULL;
     static char *kwlist[] = {"number", "ndigits", 0};
-    PyObject *number, *round;
+    PyObject *number, *round, *result;
+    _Py_IDENTIFIER(__round__);
 
     if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|O:round",
                                      kwlist, &number, &ndigits))
@@ -1824,24 +1831,21 @@ builtin_round(PyObject *self, PyObject *args, PyObject *kwds)
             return NULL;
     }
 
-    if (round_str == NULL) {
-        round_str = PyUnicode_InternFromString("__round__");
-        if (round_str == NULL)
-            return NULL;
-    }
-
-    round = _PyType_Lookup(Py_TYPE(number), round_str);
+    round = _PyObject_LookupSpecial(number, &PyId___round__);
     if (round == NULL) {
-        PyErr_Format(PyExc_TypeError,
-                     "type %.100s doesn't define __round__ method",
-                     Py_TYPE(number)->tp_name);
+        if (!PyErr_Occurred())
+            PyErr_Format(PyExc_TypeError,
+                         "type %.100s doesn't define __round__ method",
+                         Py_TYPE(number)->tp_name);
         return NULL;
     }
 
     if (ndigits == NULL)
-        return PyObject_CallFunction(round, "O", number);
+        result = PyObject_CallFunctionObjArgs(round, NULL);
     else
-        return PyObject_CallFunction(round, "OO", number, ndigits);
+        result = PyObject_CallFunctionObjArgs(round, ndigits, NULL);
+    Py_DECREF(round);
+    return result;
 }
 
 PyDoc_STRVAR(round_doc,
@@ -2408,6 +2412,12 @@ PyObject *
 _PyBuiltin_Init(void)
 {
     PyObject *mod, *dict, *debug;
+
+    if (PyType_Ready(&PyFilter_Type) < 0 ||
+        PyType_Ready(&PyMap_Type) < 0 ||
+        PyType_Ready(&PyZip_Type) < 0)
+        return NULL;
+
     mod = PyModule_Create(&builtinsmodule);
     if (mod == NULL)
         return NULL;