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package mirage-block
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type error = [ | `Unknown of string(*an undiagnosed error
*)| `Unimplemented(*operation not yet implemented in the code
*)| `Is_read_only(*you cannot write to a read/only instance
*)| `Disconnected(*the device has been previously disconnected
*)
]The type for IO operation errors.
exception Error of errorAn error value wrapped up in an exception
val ok_exn : 'a result -> 'aExtract an `Ok x value, or throw an Error exception
module Monad : sig ... end