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(* $Id$ *)
(*s States of the system. *)
type state
val intern_state : string -> unit
val extern_state : string -> unit
(*s Rollback. [with_heavy_rollback f x] applies [f] to [x] and restores the
state of the whole system as it was before the evaluation if an exception
is raised. *)
val with_heavy_rollback : ('a -> 'b) -> 'a -> 'b
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