Running into a codegen bug related to unpacking-inside-try-handlers

test/tests/unpacking_exceptions.py

+# expected: fail
+# - we currently can't even compile this correctly
+#
+# The unpacking should be atomic: ie either all of the names get set or none of them do.
+# We currently assume that unpacking can only throw an exception from the tuple being the
+# wrong length, but instead we should be emulating the UNPACK_SEQUENCE bytecode.
+
+class C(object):
+    def __getitem__(self, i):
+        print "__getitem__", i
+        if i == 0:
+            return 1
+        raise IndexError
+
+    def __len__(self):
+        print "len"
+        return 2
+
+def f():
+    try:
+        x, y = C()
+    except ValueError:
+        pass
+
+    try:
+        print x
+    except NameError, e:
+        print e
+    try:
+        print y
+    except NameError, e:
+        print e
+
+f()