Confirmed.

```
>>> for a, b, c in [(1, (2, 3))]: print a, b, c
... 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: need more than 2 values to unpack
>>> for a, (b, c) in [(1, (2, 3))]: print a, b, c
... 
1 2 3
>>>
```