Capture slots #33
Description
Add an argument matcher that is able to capture an argument for later verification.
Potential pitfalls:
- It will probably require the argument to be cloneable + 'static. This is to help prevent the argument being dropped before the slot.
- It will probably require the slot to be surrounded by some sort of
Rc<RefCell<T>>. This will help prevent any soundness issues with the slot being dropped before the last call to the mocked method.
cc: @muscovite