SF bug #1153075: "PyXxx_Check(x) trusts x->ob_type->tp_mro".
A patch by mwh to check that user-defined mro's are reasonable
enough.
diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
index 2ea8186..e954a0f 100644
--- a/Lib/test/test_descr.py
+++ b/Lib/test/test_descr.py
@@ -1635,6 +1635,37 @@
vereq(X.__mro__, (object, A, C, B, D, X))
vereq(X().f(), "A")
+ try:
+ class X(object):
+ class __metaclass__(type):
+ def mro(self):
+ return [self, dict, object]
+ except TypeError:
+ pass
+ else:
+ raise TestFailed, "devious mro() return not caught"
+
+ try:
+ class X(object):
+ class __metaclass__(type):
+ def mro(self):
+ return [1]
+ except TypeError:
+ pass
+ else:
+ raise TestFailed, "non-class mro() return not caught"
+
+ try:
+ class X(object):
+ class __metaclass__(type):
+ def mro(self):
+ return 1
+ except TypeError:
+ pass
+ else:
+ raise TestFailed, "non-sequence mro() return not caught"
+
+
def overloading():
if verbose: print "Testing operator overloading..."