Commits on Nov 19, 2021

1. subscriber: expose access to event scope in FmtContext …

   Currently, `tracing_subscriber::fmt`'s `FmtContext` type is missing the
   `span_scope`, `event_span`, and `event_scope` methods that `Context`
   provides. This is a shame; these will make it much easier for users
   implementing formatters to iterate over the scope of the event being
   formatted correctly. We should expose those methods.
   
   This branch adds new methods to `FmtContext`, most of which forward to
   the similarly-named `Context` methods. However, because a `FmtContext`
   is only constructed when formatting an event, we can also make the event
   scope methods a little more ergonomic by storing a ref to the span being
   formatted and automatically passing it to `Context::event_scope` and
   `Context::event_span`. This means the `FmtContext` can just always return
   the current event's scope without the user having to pass it in.

   

   hawkw committed Nov 19, 2021
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