Test (observe-lwt-unix.Observe_lwt

exception Capture_error of Observe.capture_error

A capture could not start. The callback is not called.

val with_capture_exn : 
  config:Observe.Config.t ->
  ?capacity:int ->
  (Observe.Capture.t -> 'a Lwt.t) ->
  'a Lwt.t

Run callback with an isolated Lwt-scoped capture of ordinary Observe.Logs calls.

The inner scope wins when scopes are nested. The prior scope is restored after success, exception, or Lwt.Canceled. A callback registered in the scope but run after closure cannot fall through to production. Bindings do not propagate through Lwt_preemptive.detach, OS threads, or another I/O implementation.