O1trace
module Thread : sig ... end
module Plugins : module type of Plugins
module Execution_timer : module type of Execution_timer
val background_thread : string -> ( unit -> unit Async.Deferred.t ) -> unit
val thread : string -> ( unit -> 'a Async.Deferred.t ) -> 'a Async.Deferred.t
val sync_thread : string -> ( unit -> 'a ) -> 'a