Iteration over tuples does not show type

[jakebailey]

t = ((1,), (2,), (3,))
for x in t:
    x

t is shown as tuple[tuple[int], tuple[int], tuple[int]] which is correct, but x has no type. You can switch it to a list and it will work, like:

l = [(1,), (2,), (3,)]
for x in l:
    x

And now x is of type tuple[int].

Found in #334.

[jakebailey]

Fixed via #546.