Warning: Reason support is experimental. We are looking for beta-tester and contributors.

Module Pa_lwt_log

module Pa_lwt_log : sig..end

Special syntax for the logging facility (deprecated)

It replaces expression of the form:

Lwt_log.info_f ~section "x = %d" x


if Lwt_log.Section.level section <= Lwt_log.Info then
        Lwt_log.info_f ~section "x = %d" x
        return ()


  • the application must be complete. For example: Log.info "%d" will make compilation fail
  • it also add the command line flags "-lwt-debug" to keep all debug messages. By default debug messages are removed.