--- /dev/null
+"""
+Broken bytecode objects can easily crash the interpreter.
+"""
+
+import types
+
+co = types.CodeType(0, 0, 0, 0, '\x04\x71\x00\x00', (),
+ (), (), '', '', 1, '')
+exec co
--- /dev/null
+"""
+gc.get_referrers() can be used to see objects before they are fully built.
+"""
+
+import gc
+
+
+def g():
+ marker = object()
+ yield marker
+ # now the marker is in the tuple being constructed
+ [tup] = [x for x in gc.get_referrers(marker) if type(x) is tuple]
+ print tup
+ print tup[1]
+
+
+tuple(g())