Some tests not passing

[MartBakler]

The following tests aren't passing

test_assertion_visitor/test_mock -- test_rl_equality
test_validator/test_instantiate -- test_generics, test_extended_generics

[JackHopkins]

In future, please create on issue for each of the above line items, such that they can be managed independently.

I think we can ignore test_rl_equality for now, as it is a pretty weird syntactic case:

assert TodoItem(goal="Go to the store and buy some milk", people=["Me"]) == create_todolist_item("I would like to go to the shop and buy some milk")

Normally, the left side of the assert is the 'thing' we are testing - in this case the function.