Make storage assignments for structs work

[cburgdorf]

What is wrong?

When #203 lands, we'll have basic support for structs.

struct House:
    price: u256
    size: u256
    vacant: bool

contract City:

    pub def get_price() -> u256:
        building: House = House(300, 500, true)

        assert building.size == 500
        assert building.price == 300
        assert building.vacant

        return building.price

However, what's not working yet is assigning a struct to storage like self.house = House(300, 500, true)

How can it be fixed

I haven't looked into it yet.

[cburgdorf]

This landed already