[erlang-questions] Specs for optional callbacks

Loïc Hoguin <>
Fri Jan 18 16:59:34 CET 2013

Is this planned?

We can today write behaviours with the specifications of the callbacks 
documented. What about optional callbacks, like gen_server's 
format_status/2? It would be great to have a way to specify the 
specifications for these, too.

Loïc Hoguin
Erlang Cowboy
Nine Nines

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