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Library
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type t = private
| ()
A token indicating that Lwt_eio was started.
If a library needs Lwt_eio to be running, it can request this token to remind the application to initialise it. This is most useful if a library has a main entry point, or some configuration value that has to be constructed before the library is used.
This type should be treated as abstract, but it is defined as private ()
to avoid breaking existing code.