Function id

pub fn id() -> ExpectedId

Returns a new, unset ExpectedId.

The ExpectedId needs to be attached to a NewSpan or an ExpectedSpan passed to MockSubscriber::new_span to ensure that it gets set. When the a clone of the same ExpectedSpan is attached to an ExpectedSpan and passed to any other method on MockSubscriber that accepts it, it will ensure that it is exactly the same span used across those distinct expectations.

For more details on how to use this struct, see the documentation on ExpectedSpan::with_id.