Uq_engines.Receiver_attn

Hello.

I've been playing around with Unixqueue and Uq_engines. When writing a 
handler with a specific group for some rather specific timeouts, I'm 
faced with the Uq_engines.Receiver_attn exception coming around.

As I've been using some receiver uq_engine, this is no surprise.

However, this exception is not declared in uq_engines.mli...

That means I cannot pattern-match for this exception since it is unknown 
to the OCaml compiler, since it's not in the .mli file.

This is a (mild) pain.

All the best,

Guillaume Yziquel.

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