Macro simulacrum_macros::was_called

macro_rules! was_called {
    ($self_:ident, $key:expr, $sig:tt -> $output:ty) => { ... };
    ($self_:ident, $key:expr, $sig:tt) => { ... };
    ($self_:ident, $key:expr) => { ... };
}

Use this macro to do a self.e.was_called self.e.was_called_returning with a shorter interface.